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Mollusks

Mollusks
by

Kenison G

on 13 December 2012

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Transcript of Mollusks

Mollusks Key Characteristics Lack Body Segmentation
Soft bodies
Have a coelom (Space between body wall and intestines)
invertabrates
3 body regions (head, visceral mass, foot)
usually have shell
mantle (Fold of tissue protecting inner organs)
Usually have radula What makes up this species? Examples:
Snails
Clams
Mussels
Squid
Octopus Seven Classes:
Monoplacophora
Polyplacophora
Aplacophora
Gastropoda
Scaphadpoda
Bivalvia
Cephalopodo Cell Structure Mollusks are multicellular
Mollusks have no cell wall
They are complex and have many cells Nutrition Mollusks will eat:
Plants
Fish
Crabs
Shrimp
Snails
Other crustaceans Transport Excretion Undigested materials are packaged and excreted through the anus
The waste goes into the mantle cavity and is carried away in the water Respiration Blood passes through gills
Oxygen is obtained from water, here carbon dioxide is given off Reproduction for most Mollusks Sperm flows in water until female siphons water, collects sperm and fertilizes her eggs
In 1-10 months the larva or glochidia will be developed
In early spring or fall the larva is released and is sent to find a host fish
After the mollusk has grown (It's a juvenile) it falls off the host and attaches or burrow into a substrate
The mollusk begins filter feeding Movement A mollusks' locomotion is based off their foot structure
Most herbivores are gliders
Many carvnivores use advanced motion (cephalapods swim using jet propulsion)
Some have fins (Example: Cuttlefish) Response to Stimuli The body color can change
This is because of a change in pigment cells (chromatophones) Interesting Facts Over 50,000 species of mollusks
The plural for "Octopus" is "Octopuses"
The Blue-Ringed Octopus is about six inches tall, but has enough venom to kill a grown man Take in food by scraping plants away from rocks with their radula
They break shells with their radula and eat the animal inside The Digestive System:
Cells lining the digestive glands come from the stomach
They take in the food and the nutrients are sent to the blood Kenison Garratt
Full transcript