Cnidarians Alexis
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Cnidarians are carnivorous animals with stinging tentacles around their mouths that have two life cycle stages - a polyp with arm-like tentacles and a motile medusa with a bell-shaped body. They capture prey with their stinging cells, pull it into their gastrovascular cavity for digestion, and transport nutrients through diffusion. Cnidarians detect stimuli through a nerve net and move using circular and longitudinal muscles that control water in their gastrovascular cavity. They reproduce both asexually and sexually through external fertilization.
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Edentata : In some animals teeth are absent hence called as edentate. e.g., Echidna or spiny ant-eater (Tachyglossus) the teeth are absent in all stages of life.
Dentata : Teeth are present in all mammals though a secon¬dary toothless condition is found in some mammals. Modern turtles and birds lack teeth. The adult platypus (Ornithorhynchus) bears epidermal teeth but no true teeth are present. In platypus embryonic teeth are replaced by horny epidermal teeth in adult.
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Heterodont
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According to the Mode of Attachment of Teeth:
Thecodont : The teeth are lodged in bony sockets or alveoli of the jaw bone and capillaries and nerves enter the pulp cavity through the open tips of the hollow roots e.g., mammals, crocodiles and in some fishes.
Acrodont: The teeth are fused to the surface of the underlying jawbone. They have no roots and are attached to the edge of the jawbone by fibrous membrane e.g., fishes, amphibians and some reptiles.
Pleurodont:
The teeth are attached to the inner-side of the jawbone. The tooth touches the bone only with the outer surface of its root. In acrodont and pleurodont types of dentition, there are no roots, and nerves and blood vessels do not enter the pulp cavity at the base, e.g., Necturus (Amphibia) and some reptiles.
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Ctenophora
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Parental care in Amphibians
Parental care in amphibians provides benefits to offspring survival. There are various types of parental care exhibited by different amphibian species, including selecting protected nesting sites, defending eggs or territories, directly transporting tadpoles to water, gluing or carrying eggs attached to the body, and even viviparity in some species. Parental care improves offspring chances of survival by protecting eggs from predators and ensuring young amphibians safely reach water once hatched.
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DENTITION IN MAMMALS
The study of arrangement structure and number of types of teeth collectively is called as dentition. Teeth are present in the foetal as well as in adults of mammals, based on the presence of teeth Mammals are two types.
Edentata : In some animals teeth are absent hence called as edentate. e.g., Echidna or spiny ant-eater (Tachyglossus) the teeth are absent in all stages of life.
Dentata : Teeth are present in all mammals though a secon¬dary toothless condition is found in some mammals. Modern turtles and birds lack teeth. The adult platypus (Ornithorhynchus) bears epidermal teeth but no true teeth are present. In platypus embryonic teeth are replaced by horny epidermal teeth in adult.
Classification According to the Shape and Size of the Teeth:
Homodont:
Homodont or Isodont type of teeth is a condition where the teeth are all alike in their shape and size in the toothed whales e.g., Pinnipedians. Fishes, amphibians, reptiles and in the extinct toothed birds.
Heterodont
Heterodont condition is the usual feature in mammals, i.e. the teeth are distinguished according to their shape, size and function. The function is also different at different parts of the tooth row.
According to the Mode of Attachment of Teeth:
Thecodont : The teeth are lodged in bony sockets or alveoli of the jaw bone and capillaries and nerves enter the pulp cavity through the open tips of the hollow roots e.g., mammals, crocodiles and in some fishes.
Acrodont: The teeth are fused to the surface of the underlying jawbone. They have no roots and are attached to the edge of the jawbone by fibrous membrane e.g., fishes, amphibians and some reptiles.
Pleurodont:
The teeth are attached to the inner-side of the jawbone. The tooth touches the bone only with the outer surface of its root. In acrodont and pleurodont types of dentition, there are no roots, and nerves and blood vessels do not enter the pulp cavity at the base, e.g., Necturus (Amphibia) and some reptiles.
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The document describes the phylum Onychophora, specifically the genus Peripatus. Peripatus is a small, soft-bodied, bilaterally symmetrical worm-like animal found in tropical regions around the world. It exhibits characteristics of both annelid worms and arthropods, serving as a connecting link between the two groups. Peripatus has a combination of annelid traits like a worm-like body, parapodia, and coelom; and arthropod traits like a chitinous exoskeleton, antennae, and tracheal breathing tubes. It also displays some primitive features not seen in modern annelids or arthropods.
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PHYLUM CNIDARIA
Cnidarians are radially symmetrical aquatic animals with stinging cells called cnidocytes. They have two main body forms - polyps and medusae. Cnidarians include jellyfish, hydras, sea anemones, and corals. They are diploblastic with two tissue layers and a jelly-like mesoglea in between. Cnidarians capture prey using stinging tentacles and digest food in their gastrovascular cavity. They play an important economic role by creating coral reef habitats for fish and generating oxygen from algae.
Ctenophora
Comb jellies, or ctenophores, are zooplankton with radial symmetry and up to 4 inches long. They move using rows of cilia combs and have transparent, globe or egg-shaped bodies over 95% water with an open center. They are voracious predators that use sticky tentacles to capture zooplankton, consuming up to 10 times their weight daily. Ctenophores reproduce externally as hermaphrodites, with planktonic larvae developing from external fertilization.
Phylum cnidaria report
Cnidarians like hydra, jellyfish, coral, and sea anemones can take the form of polyps or medusas. Polyps are attached to surfaces while medusas are free-swimming. They capture prey using nematocysts in their tentacles and digest food in their guts. Reproduction varies between species, but includes both asexual budding and sexual reproduction.
Cnidaria
The document summarizes key characteristics of the phylum Cnidaria. Cnidaria exhibit radial symmetry and have two basic body plans - either diploblastic or with radial canals extending from a central gastrovascular cavity. They possess cnidocytes or cnidae, which are capsule-like organelles used to capture prey. The phylum contains four classes: Anthozoa, Hydrozoa, Scyphozoa, and Cubozoa.
Cnidarians
Cnidarians are soft-bodied animals that have stinging cells called cnidocytes. They have two main forms in their life cycle, the polyp and medusa forms. Cnidarians feed by pulling prey into their gastrovascular cavity, which is a single opening that functions as both a digestive system and circulatory system. Major groups of cnidarians include jellyfish, hydras, sea anemones, and corals.
Cnidarians
Cnidarians are soft-bodied aquatic animals that exhibit radial symmetry and possess true tissues. They have a sac-like body with a central digestive cavity and a single opening surrounded by tentacles bearing stinging cells. Cnidarians exist as sessile polyps or free-swimming medusae, and their life cycle may alternate between these two forms. The phylum is divided into three classes: Hydrozoa (hydras), Scyphozoa (jellyfish), and Anthozoa (corals and sea anemones).
Cnidaria
Phylum Cnidaria contains stinging cells called cnidocytes that contain nematocysts. They have a sac-like body plan with a gastrovascular cavity. Their life cycle involves both asexual and sexual phases - polyps can reproduce asexually while medusae are the sexual phase. Important classes include Scyphozoa, Cubozoa, Hydrozoa, and Anthozoa. Cnidarians are ecologically important as they provide habitat and protect coastlines with coral reefs.
10. Phyla Cnidaria and Ctenophora
Phylum Cnidaria and Ctenophora are two groups of aquatic animals. Cnidaria includes jellyfish, corals, sea anemones and have radial symmetry and two main forms - polyps and medusae. They have stinging nematocyst cells and a nerve net. Ctenophora, or comb jellies, are similar but not cnidarians and move using cilia.
Phylum cnidaria
This document summarizes key information about the phylum Cnidaria, focusing on four classes: Hydrozoa, Anthozoa, Scyphozoa, and Cubozoa. It outlines their shared traits of radial symmetry, carnivorous diet, and ability to reproduce both sexually and asexually. It also describes the polyp and medusa life stages and body plan consisting of ectoderm, endoderm, mesoglea, mouth, and tentacles. Details are provided on nematocyst stinging cells and specific characteristics of corals, anemones, jellyfish, and hydrozoans.
Phylum cnidaria
The phylum Cnidaria includes sea jellies, hydra, coral colonies, sea anemones, sea pens, and sea fans. They are characterized by having radial symmetry, two germ layers, a jelly-like mesoglea layer, an acoelomate body cavity, and specialized stinging cells called cnidocytes. Many species have both a sessile polyp stage and a free-swimming medusa stage. Cnidarians play important ecological roles through food sources, habitat, symbiosis, and wave protection.
Phylum cnidaria
The document summarizes the characteristics of the phylum Cnidaria. It notes that Cnidaria have four divisions - Scyphozoa, Cubozoa, Hydrozoa, and Anthozoa. They have two basic body forms and lack bones, instead having a hydrostatic skeleton for flexibility and locomotion. Most Cnidaria are diploblastic with outer ectoderm and inner endoderm layers containing nerve nets. They have a nerve net system and diffuse respiration and circulation. Reproduction can be sexual or asexual. All Cnidaria have radial symmetry and tentacles containing stinging nematocyst cells.
Phylum Mollusca
Molluscs are soft-bodied animals with three main body zones - a foot, visceral mass containing internal organs, and mantle. They have a hard calcium carbonate shell or have lost it through evolution. There are three main types - gastropods with one shell, bivalves with two shells, and cephalopods like octopus and squid. Molluscs serve as food but some are poisonous or venomous.
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Cnidaria gen features -2012
- Cnidarians are a phylum of mostly marine animals that include jellyfish, corals, sea anemones. They have radial symmetry and two basic body forms - polyps and medusae.
- They have stinging cells called cnidocytes that help capture prey. Their nervous system is a nerve net. They reproduce sexually and asexually. Larvae are called planulae.
- Anthozoans like corals and sea anemones have a tubular body with a mouth and oral disc surrounded by tentacles. Their pharynx leads into the coelenteron.
Phylum Cnidaria
1. The document provides an overview of the phylum Cnidaria, which includes jellyfish, corals, and hydroids.
2. Cnidarians are radially or biradially symmetrical and have stinging cells called nematocysts. They exhibit a diploblastic body plan with two tissue layers separated by a gelatinous mesoglea.
3. Many cnidarians alternate between a sessile polyp stage and a motile medusa stage. Reproduction involves external fertilization producing a planula larva.
Luis flores animal phyla
Porifera are sponges that live in aquatic environments and have pores that allow water flow through their bodies for filter feeding, respiration, and waste removal. Cnidarians like jellyfish, sea anemones, and corals have stinging tentacles used to capture prey which is then brought to the mouth. Platyhelminths are flatworms that have no skeleton and use cilia and muscles to move; they have a combined digestive/excretory system and reproduce asexually.
Phylum Cnidaria, Coelenterata pptx
This document describes the phylum Cnidaria and some of its key characteristics. It discusses the body wall and nematocysts, alternation of generations, maintenance functions like digestion and movement, and reproduction. It also describes five classes within the phylum - Hydrozoa, Staurozoa, Scyphozoa, Cubozoa, and Anthozoa. For Hydrozoa, it provides details on classes like Obelia, with colonial polyps, and Gonionemus, which is a medusa-dominant hydrozoan. Hydra is also discussed as an example without a medusa stage.
chordate
Cnidarians are soft-bodied animals with stinging cells that have two main forms in their life cycle, polyp and medusa. They have a gastrovascular cavity for digestion where food is pulled inside and broken down outside cells. Major groups include jellyfish, hydras, sea anemones, and corals, which all move using hydrostatic skeletons and muscles.
Biology 26.3
Cnidarians are soft-bodied carnivorous animals that have stinging tentacles arranged around their mouths. They have a simple nervous system called a nerve net and use cnidocytes and nematocysts to capture prey and defend themselves. Cnidarians typically have a life cycle that alternates between a sessile polyp stage and a motile medusa stage.
cnidarians.pptx
Cnidarians are a phylum of aquatic animals that include jellyfish, corals, sea anemones. They have radial symmetry and tentacles surrounding a central mouth. Their bodies are made of two layers and they use stinging cells called cnidocytes for defense and hunting. Cnidarians reproduce both sexually and asexually. They play important ecological roles like building coral reefs but some species' stings can harm humans.
Group No 4-WPS Office.pptx
This document provides information on sponges and cnidarians. It discusses the distinguishing features, basic body structures, life functions, habitats, and evolutionary histories of these early animal phyla. Sponges are multicellular organisms that live in water and have pores but lack nervous, digestive or circulatory systems. They reproduce sexually or through budding. Cnidarians are more complex than sponges and have stinging cells called cnidocytes. They have two main cell layers and feed through predation or symbiosis. Their fossil record extends back over 500 million years.
Echinoderms: Marvels of the Ocean Presentation. pptx
Echinodermata constitutes amazing species found in the oceans of this world. This presentation gives in detail the basic characteristics of echinoderms.
Read and Have Fun!
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This document provides information about the phylum Echinodermata. It describes their key characteristics such as radial symmetry, tube feet powered by a water vascular system, and calcareous plates or spines covering their skin. Examples of classes within this phylum are mentioned, including sea stars, brittle stars, sea urchins, sea cucumbers, and sea lilies. Their ecology, behavior, reproduction, and classification are summarized.
Coelenterates - classification and gen characters
Coelenterates are diploblastic animals with a radial or biradial symmetry and two tissue layers. They are divided into three phyla - Hydrozoa, Scyphozoa, and Anthozoa - based on their polyp and medusa forms. Hydrozoans have both polyp and medusa stages in their life cycle while scyphozoans are medusa-dominant and anthozoans are polyp-dominant. Cnidarians have stinging cells called nematocysts and a gastrovascular cavity that functions in digestion, circulation, and osmoregulation. They reproduce both sexually and asexually.
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This document provides an overview of sponges and cnidarians. It discusses their distinguishing features, basic body structures, and evolutionary histories. Sponges are multicellular organisms that lack tissues and have pores to intake and output water. Cnidarians are diploblastic animals with stinging cells that have two main layers and feed through predation or symbiosis. Both groups have a long fossil record dating back hundreds of millions of years.
CH 28 Introduction To Arthropods
Arthropods first appeared in oceans over 600 million years ago. They have evolved to have fewer body segments and specialized appendages for tasks like feeding, movement, and other functions. Most living arthropods like spiders and insects only have two or three different forms that serve different purposes. Arthropods undergo molting when they outgrow their exoskeletons, shedding the entire exoskeleton and growing a new larger one.
Cnidaria. ppt
Phylum Cnidaria includes jellyfish, sea anemones, corals, and hydroids. They have radial symmetry, with two main layers surrounding a jelly-like mesoglea. They lack organ systems but absorb oxygen through their skin. Cnidarians have stinging cells called cnidocytes that contain barbed nematocysts. They digest food within their gastrovascular cavity and expel wastes through the same opening. Cnidarians have both polyp and medusa life stages and can reproduce sexually or asexually through budding.
17. phylum platyhelminthes with full explanation
This document provides information about the phylum Platyhelminthes, specifically focusing on the class Turbellaria. Some key points:
- The phylum Platyhelminthes contains over 20,000 flatworm species ranging in size from 1mm to 25m in length. They have an organ-system level organization.
- The class Turbellaria consists of mostly free-living flatworms. Turbellarians are found in freshwater and marine environments where they crawl on surfaces. They are predators or scavengers.
- Turbellarians have a simple digestive system with a pharynx and digestive cavity. Nutrients are absorbed intracellularly after food is broken down.
Phylum Echinodermata
A brief account of the phylum Echinodermata.
By:- Sabahat Batul Khusnuma
Christ University,
Banglore
Kingdom Animalia - Invertebrates
The document provides an overview of invertebrate animal classification, describing key characteristics of major phyla. It discusses porifera, cnidarians, flatworms, nematodes, annelids, molluscs, arthropods, and echinoderms. For each group, it describes anatomy, examples of types of animals in the group, and sometimes life cycles or additional details.
Locomotry organ in non chordata.pptx
1. Many non-chordate organisms use hydrostatic locomotion, where muscles in the body cavity or epidermis contract to allow movement. Examples include hydra, earthworms, and echinoderms.
2. Protozoans use pseudopodia, flagella, or cilia for locomotion. Pseudopodia form through cytoplasm streaming, flagella undulate through movements of the axoneme, and cilia beat in coordinated waves.
3. Echinoderms move through the hydraulic pressure of their water vascular system, which causes tube feet to extend, adhere to the substrate, and then contract to pull the body forward in a repeating motion.
ZL 121 Lecture 6 Cnidaria_Ctenophora(1)(1).ppt
Phylum Cnidaria includes jellyfish, sea anemones, corals, hydras and Portuguese man-of-war. They are diploblastic animals with radial symmetry and specialized cells. Many alternate between asexual polyp and sexual medusa stages with polyps attaching to substrates and medusas dispersing gametes. Cnidarians capture prey using stinging nematocysts and may form symbiotic relationships with algae. The four classes are distinguished by their dominant life cycle stage and include hydrozoans, scyphozoans, anthozoans and cubozoans.
Mullusk
Mollusks are a diverse phylum of soft-bodied animals that usually have an external or internal shell. They include snails, slugs, clams, squids, and octopuses. The basic body plan of mollusks consists of a foot, mantle, shell, and visceral mass. The three main classes of mollusks are gastropods, bivalves, and cephalopods. Gastropods are shelled or shell-less mollusks that move using a foot, while bivalves have two shells held together by muscles. Cephalopods like squid and octopus have a head attached to a muscular foot that is modified into tentacles.
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Biology 26.1
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Biology 22.5
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Earth science 13.4
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Earth science 13.2
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Earth science 13.3
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