1. The document discusses the evolution of early fish according to the geological time scale. It describes important early fish species from the Cambrian, Ordovician, Silurian, Devonian, Carboniferous, Permian, Triassic, Jurassic, Cretaceous and Cenozoic eras.
2. Early fish evolved from jawless fish like Haikouichthys in the Cambrian period to jawed fish like Arandaspis in the Ordovician. Important jawed fish in the Silurian included spiny sharks and placoderms.
3. Diverse fish groups appeared in the Devonian period, including the first lungfish and sharks. Placoderms
Introduction
Ostracoderms (shell-skinned) are of several groups of extinct, primitive, jawless fishes that were covered in an armour of bony plates.
They appeared in the Cambrian, about 510 million years ago, and became extinct towards the end of the Devonian, about 377 million years ago. They were quite abundant during the upper Silurian and Devonian periods. Most of fossils of Ostracodermi were preserved in the bottom sediments of freshwater streams.
However, the opinion is sharply divided as to whether their habitat was freshwater or marine.
The first fossil fishes that were discovered were ostracoderms.
The Swiss anatomist Louis Agassiz received some fossils of bony armored fish from Scotland in the 1830s.
The ostracoderms resembled the present day cyclostomes (lampreys and hagfishes) in many respects and together with them constitute a special group of jawless vertebrates, the Agnatha.
Characteristics: They use gills exclusively for respiration but not for feeding . Earlier chordates with gills used them for both respiration and feeding. Ostracoderms had separate pharyngeal gill pouches along the side of the head, which were permanently open with no protective operculum. mostly small to medium-sized fishes, protected by a heavy, bony dermal (derived from skin) armor. bottom-dwellers; filter-feeders or grazers. no paired fins, but many with stabilizing paired flaps on either side of head.
(1) Ostracoderms were the first vertebrates.
(2) They were popularly called armoured fishes.
(4) They lived in freshwater.
(5) They were bottom dwellers.
(6) Their body was fish-like and did not exceed 30 cm in size.
(7) Paired fins were absent.
(8) Median and caudal fins were present.
(9) The caudal fin was of heterocercal type.
(10) The head and thorax were covered by heavy armour of bones. It protected ostracoderms from the giant scorpion like arthropods, eurypterids.
(11) Bony skull was well developed.
(12) Mouth was mostly present on the ventral side.
(13) They were having large number of gill slits.
(14) The nervous system had 10 pairs of cranial nerves.
(15) The head had a pair of lateral eyes, and a median pineal eye.
(16) They were filter feeders, feeding like a vacuum cleaner.
(17) The endoskeleton was either bony or cartilaginous.
Fishes, amphibians, reptiles, and birds have paired pharyngeal ultimobranchial glands that secrete the hypocalcemic hormone calcitonin. The corpuscles of Stannius, unique glandular islets found only in the kidneys of bony fishes, secrete a peptide called hypocalcin.
Introduction
Ostracoderms (shell-skinned) are of several groups of extinct, primitive, jawless fishes that were covered in an armour of bony plates.
They appeared in the Cambrian, about 510 million years ago, and became extinct towards the end of the Devonian, about 377 million years ago. They were quite abundant during the upper Silurian and Devonian periods. Most of fossils of Ostracodermi were preserved in the bottom sediments of freshwater streams.
However, the opinion is sharply divided as to whether their habitat was freshwater or marine.
The first fossil fishes that were discovered were ostracoderms.
The Swiss anatomist Louis Agassiz received some fossils of bony armored fish from Scotland in the 1830s.
The ostracoderms resembled the present day cyclostomes (lampreys and hagfishes) in many respects and together with them constitute a special group of jawless vertebrates, the Agnatha.
Characteristics: They use gills exclusively for respiration but not for feeding . Earlier chordates with gills used them for both respiration and feeding. Ostracoderms had separate pharyngeal gill pouches along the side of the head, which were permanently open with no protective operculum. mostly small to medium-sized fishes, protected by a heavy, bony dermal (derived from skin) armor. bottom-dwellers; filter-feeders or grazers. no paired fins, but many with stabilizing paired flaps on either side of head.
(1) Ostracoderms were the first vertebrates.
(2) They were popularly called armoured fishes.
(4) They lived in freshwater.
(5) They were bottom dwellers.
(6) Their body was fish-like and did not exceed 30 cm in size.
(7) Paired fins were absent.
(8) Median and caudal fins were present.
(9) The caudal fin was of heterocercal type.
(10) The head and thorax were covered by heavy armour of bones. It protected ostracoderms from the giant scorpion like arthropods, eurypterids.
(11) Bony skull was well developed.
(12) Mouth was mostly present on the ventral side.
(13) They were having large number of gill slits.
(14) The nervous system had 10 pairs of cranial nerves.
(15) The head had a pair of lateral eyes, and a median pineal eye.
(16) They were filter feeders, feeding like a vacuum cleaner.
(17) The endoskeleton was either bony or cartilaginous.
Fishes, amphibians, reptiles, and birds have paired pharyngeal ultimobranchial glands that secrete the hypocalcemic hormone calcitonin. The corpuscles of Stannius, unique glandular islets found only in the kidneys of bony fishes, secrete a peptide called hypocalcin.
Exotic fish introduction to india and their impact on indigenous speciesAshish sahu
The exotic varieties of fish have been found to encroach the natural water bodies and adversely affect the indigenous fish species. ... Owing to extensive practice of composite culture, three fast growing exotic fishes are introduced along with the three Indian major carps.
Many types of fish migrate on a regular basis, on time scales ranging from daily to annually or longer, and over distances ranging from a few metres to thousands of kilometres. Fish usually migrate to feed or to reproduce, but in other cases the reasons are unclear.
Migrations involve the fish moving from one part of a water body to another on a regular basis. Some particular types of migration are anadromous, in which adult fish live in the sea and migrate into fresh water to spawn, and catadromous, in which adult fish live in fresh water and migrate into salt water to spawn.
Marine forage fish often make large migrations between their spawning, feeding and nursery grounds. Movements are associated with ocean currents and with the availability of food in different areas at different times of year. The migratory movements may partly be linked to the fact that the fish cannot identify their own offspring and moving in this way prevents cannibalism. Some species have been described by the United Nations Convention on the Law of the Sea as highly migratory species. These are large pelagic fish that move in and out of the exclusive economic zones of different nations, and these are covered differently in the treaty from other fish.
Salmon and striped bass are well-known anadromous fish, and freshwater eels are catadromous fish that make large migrations. The bull shark is a euryhaline species that moves at will from fresh to salt water, and many marine fish make a diel vertical migration, rising to the surface to feed at night and sinking to lower layers of the ocean by day. Some fish such as tuna move to the north and south at different times of year following temperature gradients. The patterns of migration are of great interest to the fishing industry. Movements of fish in fresh water also occur; often the fish swim upriver to spawn, and these traditional movements are increasingly being disrupted by the building of dams.
In aquatic animals such as fish respiration takes place through special respiratory organs called gills, however lung fish respiration takes place through lungs. Gills are present on both the sides of the head of fish. The gills are covered by gill covers also called operculum. When the fish open its mouth, water is drawn into the buccal cavity and passed through the gills. The gills contain special type of cells that absorb the oxygen present in water. The absorbed oxygen is then supplied to all the cells of body through blood. In the cells, oxygen is converted into carbon dioxide and returned back to gills through blood. Ultimately, the gills release the carbon dioxide in water passing through them.
Respiration in Fish
The gills of fish are very efficient; it is estimated gills can extract about 80% oxygen dissolved in water. In addition to the respiratory organs, the gills have an important role in maintaining the right balance of salts in the body.
ORIGIN OF CHORDATES
Animal kingdom is basically divided into two sub kingdoms:
Non-chordata- including animals without notochord.
Chordata- This comprising animals having notochord or chorda dorsalis.
Chordates were evolved sometime 500 million years ago during Cambrian period (invertebrates were also began to evolve in this period) .
Chamberlain (1900) pointed out that all modern chordates possess glomerular kidneys that are designed to remove excess water from body.
It is believed that Chordates have originated from invertebrates.
It is difficult to determine from which invertebrate group the chordates were developed.
Chordate ancestors were soft bodied animals. Hence they were not preserved as Fossils.
However, early fossils of chordates have all been recovered from marine sediments and even modern protochordates are all marine forms.
Also glomerular kidneys are also found in some marine forms such as myxinoids and sharks. That makes the marine origin of chordates more believable.
Chordates evolved from some deuterostome ancestor (echinoderms, hemichordates, pogonophorans etc.) as they have similarities in embryonic development, type of coelom and larval stages.
Many theories infers origin of chordates, hemichordates and echinoderms from a common ancestor.
includes the acanthodians, bony --fishes, and their tetrapod offspring.
Teleostomes give rise to the teleosts (Teleostei).
ACANTHODII “Spiny forms”
The name is derived from the Greek root acantha (Ακανθα), which refers to a spine
Generally small fish but could be as long as 2 meters
Called spiny forms
The first fishes to have jaws
Numerous fins (both in-line and paired), most of which were supported at the anterior end by a large spine.
Basal gnathostomes that shared a suite of characters with the Osteichthyes and the Chondrichthyes (e.g. gills cover by an operculum, placoid-like scales, etc.)
Osteichthyes “bone” and “fish”
Bony Fish
At least some bone in their skeleton and/or scales.
·Operculum-Cover for the gill openings.
Some have lungs·
Lepidotrichia-slender bony rods or “rays”
Swim Bladders to adjust depth in the water. ·
Two classes:
Actinopterygians
Sarcopterygians
Actinopterygii “Ray-finned”
-dominant aquatic vertebrates since the mid-Paleozoic.
Fish Biologists
Chondrosteans
Holosteans
Teleosts
TWO DIVISIONS:
Palaeonisciformes
Neopterygii
Palaeonisciformes “primitive ray- finned fishes”
-Probably the earliest bony fishes.
-Includes living paddlefish,sturgeon and bichir (Africa)
-Marine and FW forms
-Characterized by...
heterocercal tail
The base of each scale was made of bone,the middle of dentin and the surface with an enamel-like substance called ganoine. Hence the name ganoid scales.
primitive forms with lungs to gulp air in oxygen-poor Devonian FW habitats
Neopterygii “advanced ray-finned fishes”
Replaced Palaeonisciformes as dominant fish group in early Mesozoic
Great range of morphologies and inhabit variety of habitats worldwide; trend toward invasion of SW habitats
Loss of ganoine scales and shortening of tail (homocercal tail)
Primitive living Neopterygians include gars and bowfins (former Holosteans)
Most recent group= Teleosts - 20,000 species; represent vast majority of living fishes
Sarcopterygii “fleshy-finned fish”
Second group of bony fishes
fins evolved into tetrapod limbs
Surviving sarcopterygian
lungfishes (dipnoans)-tropical streams
Coelacanths-e deep waters of the Indian Ocean
Choanae- external nostrils opening internally to the mouth through holes
Scale types of bony fishes
Fish tail types
Actinistia (Coelacanths)-first appeared in the Middle Devonian and survived into the Late Mesozoic
Latimeria- deep oceanic shelves of 100–400 meters
braincase - divided by a hingelike joint transversely across the top of the skull
vertebral centra – tiny
notochord is- prominent
swim bladder –doesn't serve in respiration but is filled with fat.
Lobefins-hold and position the fish within feeding currents
Exotic fish introduction to india and their impact on indigenous speciesAshish sahu
The exotic varieties of fish have been found to encroach the natural water bodies and adversely affect the indigenous fish species. ... Owing to extensive practice of composite culture, three fast growing exotic fishes are introduced along with the three Indian major carps.
Many types of fish migrate on a regular basis, on time scales ranging from daily to annually or longer, and over distances ranging from a few metres to thousands of kilometres. Fish usually migrate to feed or to reproduce, but in other cases the reasons are unclear.
Migrations involve the fish moving from one part of a water body to another on a regular basis. Some particular types of migration are anadromous, in which adult fish live in the sea and migrate into fresh water to spawn, and catadromous, in which adult fish live in fresh water and migrate into salt water to spawn.
Marine forage fish often make large migrations between their spawning, feeding and nursery grounds. Movements are associated with ocean currents and with the availability of food in different areas at different times of year. The migratory movements may partly be linked to the fact that the fish cannot identify their own offspring and moving in this way prevents cannibalism. Some species have been described by the United Nations Convention on the Law of the Sea as highly migratory species. These are large pelagic fish that move in and out of the exclusive economic zones of different nations, and these are covered differently in the treaty from other fish.
Salmon and striped bass are well-known anadromous fish, and freshwater eels are catadromous fish that make large migrations. The bull shark is a euryhaline species that moves at will from fresh to salt water, and many marine fish make a diel vertical migration, rising to the surface to feed at night and sinking to lower layers of the ocean by day. Some fish such as tuna move to the north and south at different times of year following temperature gradients. The patterns of migration are of great interest to the fishing industry. Movements of fish in fresh water also occur; often the fish swim upriver to spawn, and these traditional movements are increasingly being disrupted by the building of dams.
In aquatic animals such as fish respiration takes place through special respiratory organs called gills, however lung fish respiration takes place through lungs. Gills are present on both the sides of the head of fish. The gills are covered by gill covers also called operculum. When the fish open its mouth, water is drawn into the buccal cavity and passed through the gills. The gills contain special type of cells that absorb the oxygen present in water. The absorbed oxygen is then supplied to all the cells of body through blood. In the cells, oxygen is converted into carbon dioxide and returned back to gills through blood. Ultimately, the gills release the carbon dioxide in water passing through them.
Respiration in Fish
The gills of fish are very efficient; it is estimated gills can extract about 80% oxygen dissolved in water. In addition to the respiratory organs, the gills have an important role in maintaining the right balance of salts in the body.
ORIGIN OF CHORDATES
Animal kingdom is basically divided into two sub kingdoms:
Non-chordata- including animals without notochord.
Chordata- This comprising animals having notochord or chorda dorsalis.
Chordates were evolved sometime 500 million years ago during Cambrian period (invertebrates were also began to evolve in this period) .
Chamberlain (1900) pointed out that all modern chordates possess glomerular kidneys that are designed to remove excess water from body.
It is believed that Chordates have originated from invertebrates.
It is difficult to determine from which invertebrate group the chordates were developed.
Chordate ancestors were soft bodied animals. Hence they were not preserved as Fossils.
However, early fossils of chordates have all been recovered from marine sediments and even modern protochordates are all marine forms.
Also glomerular kidneys are also found in some marine forms such as myxinoids and sharks. That makes the marine origin of chordates more believable.
Chordates evolved from some deuterostome ancestor (echinoderms, hemichordates, pogonophorans etc.) as they have similarities in embryonic development, type of coelom and larval stages.
Many theories infers origin of chordates, hemichordates and echinoderms from a common ancestor.
includes the acanthodians, bony --fishes, and their tetrapod offspring.
Teleostomes give rise to the teleosts (Teleostei).
ACANTHODII “Spiny forms”
The name is derived from the Greek root acantha (Ακανθα), which refers to a spine
Generally small fish but could be as long as 2 meters
Called spiny forms
The first fishes to have jaws
Numerous fins (both in-line and paired), most of which were supported at the anterior end by a large spine.
Basal gnathostomes that shared a suite of characters with the Osteichthyes and the Chondrichthyes (e.g. gills cover by an operculum, placoid-like scales, etc.)
Osteichthyes “bone” and “fish”
Bony Fish
At least some bone in their skeleton and/or scales.
·Operculum-Cover for the gill openings.
Some have lungs·
Lepidotrichia-slender bony rods or “rays”
Swim Bladders to adjust depth in the water. ·
Two classes:
Actinopterygians
Sarcopterygians
Actinopterygii “Ray-finned”
-dominant aquatic vertebrates since the mid-Paleozoic.
Fish Biologists
Chondrosteans
Holosteans
Teleosts
TWO DIVISIONS:
Palaeonisciformes
Neopterygii
Palaeonisciformes “primitive ray- finned fishes”
-Probably the earliest bony fishes.
-Includes living paddlefish,sturgeon and bichir (Africa)
-Marine and FW forms
-Characterized by...
heterocercal tail
The base of each scale was made of bone,the middle of dentin and the surface with an enamel-like substance called ganoine. Hence the name ganoid scales.
primitive forms with lungs to gulp air in oxygen-poor Devonian FW habitats
Neopterygii “advanced ray-finned fishes”
Replaced Palaeonisciformes as dominant fish group in early Mesozoic
Great range of morphologies and inhabit variety of habitats worldwide; trend toward invasion of SW habitats
Loss of ganoine scales and shortening of tail (homocercal tail)
Primitive living Neopterygians include gars and bowfins (former Holosteans)
Most recent group= Teleosts - 20,000 species; represent vast majority of living fishes
Sarcopterygii “fleshy-finned fish”
Second group of bony fishes
fins evolved into tetrapod limbs
Surviving sarcopterygian
lungfishes (dipnoans)-tropical streams
Coelacanths-e deep waters of the Indian Ocean
Choanae- external nostrils opening internally to the mouth through holes
Scale types of bony fishes
Fish tail types
Actinistia (Coelacanths)-first appeared in the Middle Devonian and survived into the Late Mesozoic
Latimeria- deep oceanic shelves of 100–400 meters
braincase - divided by a hingelike joint transversely across the top of the skull
vertebral centra – tiny
notochord is- prominent
swim bladder –doesn't serve in respiration but is filled with fat.
Lobefins-hold and position the fish within feeding currents
Kingdom Animalia Phylum Chordata Class ReptaliaiPagador
In order for us to understand how all living organisms are related, they are arranged into different groups. The more features that a group of animals share, the more specific the group is. Animals are given scientific names so that people all around the world can communicate about animals, no matter what language they speak (these names are traditionally Latin words). Animals belong to a number of different groups, starting with the animal kingdom.
Kingdom
All living organisms are first placed into different kingdoms. There are five different kingdoms to classify life on Earth, which are Animals, Plants, Fungi, Bacteria, and Protists (single-celled organisms).
Phylum
The animal kingdom is divided into 40 smaller groups, known as phylum. Here, animals are grouped by their main features. Animals usually fall into one of five different phylum which are Cnidaria (invertebrates), Chordata (vertebrates), Arthropods, Molluscs and Echinoderms.
Class
The phylum group is then divided into even smaller groups, known as classes. The Chordata (vertebrates) phylum splits up into Mammalia (Mammals), Actinopterygii (Bony Fish), Chondrichthyes (Cartilaginous Fish) , Aves (Birds), Amphibia (Amphibians) and Reptilia (Reptiles).
Order
Each class is divided into small groups again, known as orders. The class Mammalia (Mammals), splits into different groups including Carnivora, Primate, Artiodactyla and Rodentia.
Family
In every order, there are different families of animals which all have very similar features. The Carnivora order breaks into families that include Felidae (Cats), Canidae (Dogs), Ursidae (Bears), and Mustelidae (Weasels).
Genus
Every animal family is then divided into small groups known as genus. Each genus contains animals that have very similar features and are closely related. For example, the Felidae (Cat) family contains genus including Felis (small Cats and domestic Cats), Panthera (Tigers, Leopards, Jaguars and Lions) and Puma (Panthers and Cougars).
Species
Each individual species within the genus is named after it's individual features and characteristics. The names of animals are in Latin so that they can be understood worldwide, and consist of two words. The first word in the name of an animal will be the genus, and the second name indicates the specific species.
Example 1 - Tiger
Kingdom: Animalia (Animal)
Phylum: Chordata (Vertebrate)
Class: Mammalia (Mammal)
Order: Carnivora (Carnivore)
Family: Felidae (Cat)
Genus: Panthera
Species: Panthera tigris (Tiger)
Mollusca of India and need for conservationAshish sahu
Mollusca is the second-largest phylum of invertebrate animals after the Arthropoda. The members are known as molluscs or mollusks. Around 85,000 extant species of molluscs are recognized. The number of fossil species is estimated between 60,000 and 100,000 additional species
Reptiles are tetrapod animals in the class Reptilia, comprising today's turtles, crocodilians, snakes, amphisbaenians, lizards, tuatara, and their extinct relatives. The study of these traditional reptile orders, historically combined with that of modern amphibians, is called herpetology.
Fish are all members of the phylum Chordata, sub-phylum Vertebrata. Fish are generally spindle-shaped, oval in section, and flattened either sideways or dorsal-ventrally. The skin is covered in protective scales, with some exceptions (lampreys, ocean sunfish). All fins have fins of some sort, all the size, number, and shape vary. Fish breathe through gills, and only a very few have actual lungs. Most fish have a special organ known as a swim bladder that prevents them from sinking, and, in some cases, aids in respiration. The common name "fish" refers to four different classes, depending on the person classifying them (there are numerous different ways to classify fish). Bony fish also have special adaptations that allow them to remain buoyant. A special organ called a swim bladder housed under the bony skeleton is a gas filled chamber that allows the bony fish to remain floating in the water. Some fish have a connection between this organ and the digestive tract to allow the extraction of oxygen. Another special adaptation is the operculum, a flap on each side of the fish that covers the chambers housing the gills. A bony fish is able to breathe without swimming simply by moving the operculum. Other hallmarks of these fish are paired fins, many teeth, dermal scales in the skin (in most species), and numerous vertebrae. Most bony fish are ray-finned fish, meaning that they have thin, flexible skeletal rays. Lobe-finned fish, the other type of bony fish, have muscular fins supported by bones. Only one species of lobe-finned fish, the coelacanth, still lives. However, it was the lobe-finned fish that made possible the colonization of land.
How to Split Bills in the Odoo 17 POS ModuleCeline George
Bills have a main role in point of sale procedure. It will help to track sales, handling payments and giving receipts to customers. Bill splitting also has an important role in POS. For example, If some friends come together for dinner and if they want to divide the bill then it is possible by POS bill splitting. This slide will show how to split bills in odoo 17 POS.
This is a presentation by Dada Robert in a Your Skill Boost masterclass organised by the Excellence Foundation for South Sudan (EFSS) on Saturday, the 25th and Sunday, the 26th of May 2024.
He discussed the concept of quality improvement, emphasizing its applicability to various aspects of life, including personal, project, and program improvements. He defined quality as doing the right thing at the right time in the right way to achieve the best possible results and discussed the concept of the "gap" between what we know and what we do, and how this gap represents the areas we need to improve. He explained the scientific approach to quality improvement, which involves systematic performance analysis, testing and learning, and implementing change ideas. He also highlighted the importance of client focus and a team approach to quality improvement.
Synthetic Fiber Construction in lab .pptxPavel ( NSTU)
Synthetic fiber production is a fascinating and complex field that blends chemistry, engineering, and environmental science. By understanding these aspects, students can gain a comprehensive view of synthetic fiber production, its impact on society and the environment, and the potential for future innovations. Synthetic fibers play a crucial role in modern society, impacting various aspects of daily life, industry, and the environment. ynthetic fibers are integral to modern life, offering a range of benefits from cost-effectiveness and versatility to innovative applications and performance characteristics. While they pose environmental challenges, ongoing research and development aim to create more sustainable and eco-friendly alternatives. Understanding the importance of synthetic fibers helps in appreciating their role in the economy, industry, and daily life, while also emphasizing the need for sustainable practices and innovation.
The French Revolution, which began in 1789, was a period of radical social and political upheaval in France. It marked the decline of absolute monarchies, the rise of secular and democratic republics, and the eventual rise of Napoleon Bonaparte. This revolutionary period is crucial in understanding the transition from feudalism to modernity in Europe.
For more information, visit-www.vavaclasses.com
2024.06.01 Introducing a competency framework for languag learning materials ...Sandy Millin
http://sandymillin.wordpress.com/iateflwebinar2024
Published classroom materials form the basis of syllabuses, drive teacher professional development, and have a potentially huge influence on learners, teachers and education systems. All teachers also create their own materials, whether a few sentences on a blackboard, a highly-structured fully-realised online course, or anything in between. Despite this, the knowledge and skills needed to create effective language learning materials are rarely part of teacher training, and are mostly learnt by trial and error.
Knowledge and skills frameworks, generally called competency frameworks, for ELT teachers, trainers and managers have existed for a few years now. However, until I created one for my MA dissertation, there wasn’t one drawing together what we need to know and do to be able to effectively produce language learning materials.
This webinar will introduce you to my framework, highlighting the key competencies I identified from my research. It will also show how anybody involved in language teaching (any language, not just English!), teacher training, managing schools or developing language learning materials can benefit from using the framework.
Unit 8 - Information and Communication Technology (Paper I).pdfThiyagu K
This slides describes the basic concepts of ICT, basics of Email, Emerging Technology and Digital Initiatives in Education. This presentations aligns with the UGC Paper I syllabus.
Welcome to TechSoup New Member Orientation and Q&A (May 2024).pdfTechSoup
In this webinar you will learn how your organization can access TechSoup's wide variety of product discount and donation programs. From hardware to software, we'll give you a tour of the tools available to help your nonprofit with productivity, collaboration, financial management, donor tracking, security, and more.
The Indian economy is classified into different sectors to simplify the analysis and understanding of economic activities. For Class 10, it's essential to grasp the sectors of the Indian economy, understand their characteristics, and recognize their importance. This guide will provide detailed notes on the Sectors of the Indian Economy Class 10, using specific long-tail keywords to enhance comprehension.
For more information, visit-www.vavaclasses.com
Ethnobotany and Ethnopharmacology:
Ethnobotany in herbal drug evaluation,
Impact of Ethnobotany in traditional medicine,
New development in herbals,
Bio-prospecting tools for drug discovery,
Role of Ethnopharmacology in drug evaluation,
Reverse Pharmacology.
Model Attribute Check Company Auto PropertyCeline George
In Odoo, the multi-company feature allows you to manage multiple companies within a single Odoo database instance. Each company can have its own configurations while still sharing common resources such as products, customers, and suppliers.
3. Fish & Early fish:
1. A limbless cold-blooded vertebrate animal with gills
and fins and living wholly in water.
2. Early fish from the fossil record are represented by
a group of small, jawless, armoured fish known as
ostracoderms. Jawless fish lineages are mostly
extinct. An extant clade, the lampreys may
approximate ancient pre-jawed fish.
WHAT IS FISH AND EARLY
FISH?
4. The earth past history is divided into six eras:
1.Azoic
2.Archaeozoic or Eozoic
3.Proterozoic(Early life)
4.Palaeozoic(Ancient life,First fish in this era at
Ordovician periods,230-505 m.y.
ago)
5.Mesozoic (Mediaeval life,135-205 m.y. ago)
6.Cenozoic (Recent life,0.025-75 m.y. ago)
GEOLOGICAL TIME SCALE
5. Paleozoic era divided into 7 periods:
1.Cambrium (505 m.y. ago, 80 m.y. duration,Trilobites
present, No fish in this period)
2.Ordovician (425 m.y. ago, 65 m.y. duration, First fish
found, probably freshwater, e.g.
Arandaspis)
3.Silurian (360 m.y. ago, 35 m.y. duration, Marine
arachnids dominant, rise of fish,e.g. spiny
shrak)
DISCUSS ABOUT PALAEOZOIC
ERA ON THE BASIS OF EARLY
FISH
6. 4.Devonian (325 m.y. ago, 45 m.y. duration, Lung
fishes, Sharks abundant)
5.Mississippian/Carboniferous (280 m.y. ago, 25
m.y.
duration, spread of ancient shark)
6.Pennsylvanian/Carboniferous (255 m.y. ago, 25
m.y.
duration, first reptiles )
7.Permian(230m.y. ago,25 m.y. duration,many
ancient
animals died out)
DISCUSS ABOUT PALAEOZOIC
ERA ON THE BASIS OF EARLY
FISH
7. EARLY FISH ACCORDING TO GEOLOGICAL
TIME SCALE…
Paleozoic era
1.Cambrian period:
a)Pikaia
Pikaia, along with Myllokunmingia and
Haikouichthys ercaicunensis immediately below, are all
candidates in the fossil record for the titles of "first
vertebrate" and "first fish". Pikaia is a genus that appeared
about 530 Ma during the Cambrian explosion of
multicellular life.
8. b) Haikouichthys :
Haikouichthys (fish from Haikou) is another
genus that also appears in the fossil record about
530 Ma, and also marks the transition from
invertebrate to vertebrates.
EARLY FISH ACCORDING TO
GEOLOGICAL TIME SCALE…
9. c)Myllokunmingia :
Myllokunmingia is a genus that appeared
about 530 Ma. It is a chordate, and it has been
argued that it is a vertebrate
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10. 2)Ordovician period:
a)Arandaspis:
Arandaspis are jawless fish that lived in the early
Ordovician period, about 480–470 Ma. It was about 15 cm
(6 in) long, with a streamlined body covered in rows of
knobbly armoured scutes. The front of the body and the
head were protected by hard plates with openings for the
eyes, nostrils and gills.
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11. b)Astraspis:
Astraspis (star shield) is an extinct genus of
primitive jawless fish related to other Ordovician
fishes, such as Sacabambaspis and Arandaspis.
Fossils show clear evidence of a sensory structure
(lateral line system).
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12. c)Thelodonts:
Thelodonts (nipple teeth) are a class of small,
extinct jawless fishes with distinctive scales instead
of large plates of armour. There is debate over
whether these represent a monophyletic grouping, or
disparate stem groups to the major lines of jawless
and jawed fish
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13. 3)Silurian period:
a)Anaspida:
Anaspida (without shield) is an extinct class of
primitive jawless vertebrates that lived during the
Silurian and Devonian periods.
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14. b)Osteostraci:
Osteostraci ("bony shields") was a class of bony-
armored jawless fish that lived from the Middle
Silurian to Late Devonian.
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15. c)Spiny shark:
Spiny sharks, more formally called "Acanthodians"
(having spines), constitute the class Acanthodii. They first
appeared by the late Silurian ~420 Ma, and were among
the first fishes to evolve jaws. They share features with
both cartilaginous fish and bony fish, but they are not true
sharks, though leading to them. They became extinct
before the end of the Permian ~250 Ma.
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16. d)Placoderms:
Placoderms, (plate-like skin), are a group of
armoured jawed fishes, of the class Placodermi. The
oldest fossils appeared during the late Silurian, and
became extinct at the end of the Devonian. Recent
studies suggest that the placoderms are possibly a
paraphyletic group of basal jawed fishes.
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17. e)Guiyu oneiros:
Guiyu oneiros, the earliest known bony fish. It has
the combination of both ray-finned and lobe-finned
features, although analysis of the totality of its
features place it closer to lobe-finned fish
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18. 3)Devonian periods:(early)
a)Psarolepis:
Psarolepis (speckled scale) is a genus of
extinct lobe-finned fish that lived around 397 to 418
Ma. Fossils of Psarolepis have been found mainly in
South China and described by paleontologist Xiaobo
Yu in 1998.
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19. b)Holoptychius:
Holoptychius is an extinct genus from the order of
porolepiform lobe-finned fish, extant from 416 to 359 Ma.
It was a streamlined predator about 50 centimetres (20 in)
long (though it could grow up to 2.5 m), which fed on other
bony fish. Its rounded scales and body form indicate that it
could have swum quickly through the water to catch prey
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20. c)Petalichthyida:
The Petalichthyida was an order of small,
flattened placoderms that existed from the beginning
of the Devonian to the Late Devonian. They were
typified by splayed fins and numerous tubercles that
decorated all of the plates and scales of their armour.
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21. d)Laccognathus:
Laccognathus (pitted jaw) was a genus of
amphibious lobe-finned fish that existed 398–360 Ma.
They were characterized by the three large pits (fossae)
on the external surface of the lower jaw, which may have
had sensory functions.[Laccognathus grew to 1–2 metres
(3–7 ft) in length. They had very short dorsoventrally
flattened heads, less than one-fifth the length of the body
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22. 3)Devonian(mid):
a)Dipterus:
Dipterus (two wings) is an extinct genus of
lungfish from 376–361 Ma. It was about 35
centimetres (14 in) long, mostly ate invertebrates,
and had lungs, not an air bladder.
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23. c)Cladoselache:
Cladoselache was the first abundant genus of
primitive shark, appearing about 370 Ma.
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24. c)Pituriaspida:
Pituriaspida (hallucinogenic shield) is a class
containing two bizarre species of armoured jawless
fishes with tremendous nose-like rostrums. They
lived in estuaries around 390 Ma.
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26. b)Materpiscis:
Materpiscis (mother fish) is a genus of ptyctodontid
placoderm from about 380 Ma. Known from only one
specimen, it is unique in having an unborn embryo
present inside, and with remarkable preservation of a
mineralised placental feeding structure (umbilical cord).
This makes Materpiscis the first known vertebrate to show
viviparity, or giving birth to live young.
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27. 4)Carboniferous period:
a)Stethacanthidae:
As a result of the evolutionary radiation,
carboniferous sharks assumed a wide variety of
bizarre shapes—including sharks of the family
Stethacanthidae.
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28. b)Falcatus:
Falcatus is a genus of small cladodont-toothed
sharks that lived 335–318 Ma. They were about 25–
30 cm (10–12 in) long.They are characterized by the
prominent fin spines that curved anteriorly over their
heads.
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29. 5)Permian period:
a)Acanthodes:
Acanthodes are an extinct genus of spiny
shark.It had gills but no teeth and was presumably a
filter feeder.
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30. Mesozoic era(75-205 Ma)
1)Triassic (205 m.y. ago):
a) Pachycormiformes:
Pachycormiformes are an extinct order of
ray-finned fish that existed from the Middle Triassic to
the K-Pg extinction (below). They were characterized
by serrated pectoral fins, reduced pelvic fins and a
bony rostrum.
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31. b)Pholidophorus:
Pholidophorus was an extinct genus of teleost,
around 40 centimetres (16 in) long, from about 240–
140 Ma.
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32. 2)Jurassic period(165 Ma):
a)Ichthyodectidae:
The family Ichthyodectidae (literally "fish-biters")
was a family of marine actinopterygian fish. They first
appeared 156 Ma during the Late Jurassic and
disappeared during the K-Pg extinction event 66 Ma. They
were most diverse throughout the Cretaceous period. E.g.
Ichthyodectidae,Gillicus arcuatus.
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33. 3)Cretaceous period(135 Ma):
a)Sturgeon:
True sturgeons appear in the fossil record
during the Upper Cretaceous. Since that time,
sturgeons have undergone remarkably little
morphological change, indicating their evolution has
been exceptionally slow and earning them informal
status as living fossils.
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34. b)Cretoxyrhina:
Cretoxyrhina mantelli was a large shark that lived
about 100 to 82 million years ago, during the mid
Cretaceous period. It is commonly known as the
Ginsu Shark. The specimen consisted of a nearly
complete associated vertebral column and over 250
associated teeth. shark's skeleton is made of
cartilage.
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35. c)Enchodus:
Enchodus is an extinct genus of bony fish. It
flourished during the Upper Cretaceous and was
small to medium in size. One of the genus' most
notable attributes are the large "fangs" at the front of
the upper and lower jaws
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36. d)Ptychodus:
Ptychodus is a genus of extinct hybodontiform
shark that lived from the late Cretaceous to the
Paleogene.
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37. Cenozoic era:
a)Amphistium:
Amphistium is a 50-million-year-old fossil
fish that has been identified as an early relative of the
flatfish, and as a transitional fossil.
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38. a)Megalodon:
Megalodon is an extinct species of shark that
lived about 28 to 1.5 Ma. It looked much like a stocky
version of the great white shark .
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