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Mollusca and Echinodermata


Lilly Sanchez

on 9 June 2009

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Transcript of Mollusca and Echinodermata

Mollusca and Echinodermata sea urchin squid starfish octopus sand dollar snail How Echinoderms get their energy Many echinoderms are carnvierous . Many echinoderms that are carniverous scavenge for food on the ocean bottom. Most echinoderms that aren't carnivores, are filter feeders, who catch whatever particles are floating in the air. Echinoderms reproduce sexually.
They have both male and female organisms
which are hard to tell apart.

Echinoderms can also reproduce asexually,
by regenerating arms and legs and other body parts. Echinoderms have radial symmetry. When echinoderms are younger, and more mobile, they usually have a bilateral body plan. Many echinoderms have spines, most of which are not pronounced . phyla: echinodermata 4 main classes Echinoidea: such as sandollars stelleroidea: such as starfish Holothuroidea: such as sea cucumbers Crinoidea:such as feather stars phyla name: mollusca cost: £ 20 reproduction how they get food body type major classes/ types scientific name: phylum mullusca how do they help humans? many mollusca members , have been used as food for many generations molluscs such as bivalves have rare pearls inside hich are harvested by man to sell(which is why many of these bivalves are endangered) not all molluscs are helpful to humans
one example is jellyfish who have stingers, and many other molluscs can either sting or bit, causing major pain or possible death molluscs are characterized by a mantle and a large cavity, which is used for many things such as disposal of waste or breathing. ~aplacophora ~polyplacophora ~monoplacophora ~gastropoda ~cephalopoda ~bivalvia ~scaphopoda ~many molluscs reproduce sexually ~ and a large muscular foot, used for movement many molluscs are filter feeders, and if they aren't then the molluscs are carnivores, they move through the ocean in serach of food
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