This document summarizes the phylum Mollusca. It describes their soft-bodied structure, shells, body zones, digestive and excretory systems. It also discusses their nervous systems, circulation, reproduction, locomotion, and the three main types - gastropods, bivalves, and cephalopods. Key details are provided on anatomy and examples of common mollusks within each type. Their ecological importance as food and environmental indicators is also noted.
Phylum Mollusca-my report..
sorry for some overlapping of texts... i was not able to edit it..it is actually because of the animations that i put it..... i just uploaded it directly :)
Scolopendra is the common centipede.
Nocturnal, predatory carnivore, found in tropical and sub-tropical countries.
Commonly lives in soil and beneath stones bark and logs in moist and damp areas and human dwellings.
Scolopendra gigantica is the largest of all living centipedes (grows up to a length of 30cm).
Class Bivalvia
Shell and associated structures
Gas exchange ,filter feeding and digestion
Reproduction and development
Other maintenance functions of Class Bivalves
Diversity in Bivalves
Presentation
Best of luck
NATURE IS FULL OF BLOSSOM AND BEAUTY AND IT ATTRACTS EVERY ONE WHO WANNA DIVE INTO IT, ONE OF THE FLOWERS OF NATURE ARE MOLLUSKS WHICH ARE CALLED THE BEAUTY OF THE OCEANS AND THEY ARE PRESENT IN A LARGE VARIETY.
SO, HERE IS SOME CUTE AND INTERESTING INFORMATION ABOUT MOLLUSKS FOR YOU GUYS.
ALIKE WILL BE APPRECIATED.
if you want to be a champion in the kingdom Animalia, then it is best for you .
this slide show covers all important features , characteristics of organisms under kingdom animalia
Phylum Mollusca
Five Classes Of Phylum Mollusca
Characteristics & Features Of Phylum Mollusca
Detail Presentation On Phylum Mollusca
Paleontology | Earth Sciences | Geology | Fossils Study | Biology
Phylum Mollusca-my report..
sorry for some overlapping of texts... i was not able to edit it..it is actually because of the animations that i put it..... i just uploaded it directly :)
Scolopendra is the common centipede.
Nocturnal, predatory carnivore, found in tropical and sub-tropical countries.
Commonly lives in soil and beneath stones bark and logs in moist and damp areas and human dwellings.
Scolopendra gigantica is the largest of all living centipedes (grows up to a length of 30cm).
Class Bivalvia
Shell and associated structures
Gas exchange ,filter feeding and digestion
Reproduction and development
Other maintenance functions of Class Bivalves
Diversity in Bivalves
Presentation
Best of luck
NATURE IS FULL OF BLOSSOM AND BEAUTY AND IT ATTRACTS EVERY ONE WHO WANNA DIVE INTO IT, ONE OF THE FLOWERS OF NATURE ARE MOLLUSKS WHICH ARE CALLED THE BEAUTY OF THE OCEANS AND THEY ARE PRESENT IN A LARGE VARIETY.
SO, HERE IS SOME CUTE AND INTERESTING INFORMATION ABOUT MOLLUSKS FOR YOU GUYS.
ALIKE WILL BE APPRECIATED.
if you want to be a champion in the kingdom Animalia, then it is best for you .
this slide show covers all important features , characteristics of organisms under kingdom animalia
Phylum Mollusca
Five Classes Of Phylum Mollusca
Characteristics & Features Of Phylum Mollusca
Detail Presentation On Phylum Mollusca
Paleontology | Earth Sciences | Geology | Fossils Study | Biology
The Cephalochordata are a small subphylum (about 28 species) of small, 5 to 10 centimetres long.
All known species are marine. They occur all around the world in both temperate and tropical waters.
Cephalochordates live in shallow marine or brackish water all over the world. They can actively swim around, but most of the time are sedentary, buried in sand.
Ascidiacea (commonly known as the ascidians or sea squirts) is a paraphyletic class in the subphylum Tunicata of sac-like marine invertebrate filter feeders
Despite their plant-like appearance, sea squirts are actually more closely related to vertebrates than they are to invertebrates such as sponges and coral.
There are more than 3,000 known sea squirt species found on the seabed around the world, with the majority of sea squirt species being found in the warmer, nutrient-rich tropical waters.
Sea squirts can vary from just 3cm to 30cm in length depending on the species of sea squirt and its habitat.
Cnidaria is a phylum containing over 9,000 species found only in aquatic and mostly marine environments. All cnidarians have radial symmetrical. There are two major body forms among the Cnidaria - the polyp and the medusa. Sea anemones and corals have the polyp form, while jellyfish are typical medusae.
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Presentations of Bavo Raeymaekers (Project lead youth unemployment at the City of Antwerp), Suzan Martens (Service designer at Knight Moves) and Adriaan De Keersmaeker (Community manager at Talk to C)
during the 'Arena • Young adults in the workplace' conference hosted by Knight Moves.
2. Structure
● soft bodied animals
○ name from Latin word "mollus" meaning soft
● most are protected by a hard shell made of
Calcium Carbonate
● have a reduced internal cell or have lost the
shell completely during evolution.
● possession of a coelom
○ coelom- a fluid-filled cavity that develops within the
mesoderm
3. Structure Cont.
● 3 distinct body zones:
○ Foot- contains sensory and motor organs
○ Visceral Mass- contains internal organs used for
digestion, excretion, and reproduction
○ Mantle- a fold of tissue that drapes over the visceral
mass and secretes a shell if there is one present
■ mantle cavity- water-filled chamber that houses
the gills, anus, and excretory pores.
● radula- straplike rasping organ used to
scrape up food with curved teeth
○ it allows the molluscs to scrape algae and other food
off of rocks and drill through the shell of prey or
catch fish
4.
5. Digestion and Excretion
● The digestive tract is complete and ciliated
with a mouth, anus, and complete stomach.
● Food is taken up by cells in the lining of the
stomach and passed into the blood
○ undigested materials are compressed and packaged
and discharged through the anus to the mantle
cavity and carried into the water currents.
● Excretory functions are carried out by a pair
of nephridia
○ nephridia- tubular structures that collect fluids from
coelom and exchange salts with body tissues as fluids
pass along the tublues.
6. Nervous System
● relatively complex
○ most complex- Octopus
● 2 pairs of main nerve cords
○ visceral- serve the internal organs
○ pedal-control the foot
● brain encircles the esophagus
● sensory ability
○ variety of organ systems
○ large, complex eyes
■ larges eyes- large squid(eyes the size of dinner
plates)
7.
8. Respiration and Circulation
● open circulatory system
○ the blood does not circulate entirely within vessels
but is collected by the gills, pumped into the heart,
and released in spaces in the tissue (hemocoel)and
returns to the gills, then the heart.
■ hemocoel- "blood cavity"
● Respiration pigment- hemocyanin
● Respiration is through gills, ctenidia, located
in the mantle cavity
9.
10. Reproduction
● sexual
● can by simple or very complex
○ varies in different classes
● fertilized egg develops into a swimming form
called a trochophore larva
● this then elongates to become a veliger larva
11. Locomotion
● varies, but is dictated by the structure of the
foot
● Herbivorous forms are gliders, moving on
waves of muscular contraction.
● Cephalopods swim actively by jet propulsion
in which water is rapidly expelled from the
mantle cavity.
● Cuttlefish and Sea Hares rely on lateral fins
for locomotion.
12.
13. Types
The three most common types
of mollusks are:
● gastropods
● bivalves
● cephalopods
14. Gastropoda
● Gastropods make up 80% of Molluscs
which consist of about 37,500
living species.
● Most gastropods have an external shell.
● They can either be herbivores, scavengers, and
carnivores.
● They usually live in oceans, on rocks and land, and in
freshwater.
● They use their muscular foot to
creep along a carpet of mucus that they
ooze out in order to crawl.
15. ● The most common gastropods are:
○ Snails - land and aquatic
○ Slugs
○ Nudibranchs
○ Pteropods - Thecosomata - sea butterflies
16.
17. Bivalvia
● Also known as Pelycopoda or Lam ellibranchia
● Bivalves always have two shells held together by hinges
and strong muscles.
● Some are omnivores (an animal or person that eats food
of both plant and animal origin) and also eat bacteria
and protists.
● They filter feed in which food sticks to the mucus on
their gill, then cilia move to their mouth.
● They may live in any watery environment because they
are able to swim and float around.
● They are the only type of molluscs that does not
have a radula.
18. ● Bivalves lack defined heads.
● Eyes may be present somewhere else on the body.
● They have an open circulatory system.
● They also have sensory cells.
● There are approximately 7,500 living species of bivalves.
● The name bivalves derives from their two valves, their
two shells in which it is divided.
● Most common bivalves include:
● Mussels
● Clams
● Oysters
● Scallops
19.
20. Cephalopoda
● Cephalopods either have internal shells,
external shells, or no shell at all.
● They are carnivores.
● They capture prey with their muscular tentacles,
crush it with their beak, and scrape the flesh off
with their radula.
● There are about 600 living species.
21. ● They all live in the ocean.
● They are able to move through jet propulsion
(squeezing a current of water out of their mantle
cavity and through a tube).
● Their closed circulatory system makes them the
fastest, smartest, and biggest of all molluscs.
● Some common cephalopods include:
○ Octopus
○ Squid
○ Cuttlefish
○ Nautilus
22. Importance of Molluscs
● Molluscs serve as food for humans as well as
for other animals.
● They are used for pearls and Native
American currencies.
● Some are used as environmental indicators
because their bodies are filled with water.
● There are about 85,000 species of molluscs.
● It is the largest marine phylum.
● There is a risk of food poisoning from toxins
that accumulate in moluscs.
● Their bites and stings are fatal and some are
venomous.