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Molluscs
Marine Biology Molluscs:The Succesful Soft Body
| Term | Definition |
|---|---|
| mantle | A thin layer of tissue that secretes the shell. |
| foot | usually used in locomotion |
| radula | a ribbon of small teeth that is used to feed,usually by rasping food from surfaces. |
| chitin | a highly resistant carbohydrate also found in other invertebrates. |
| umbo | the upper hump near the hinge of each shell, is the oldest part of the shell. |
| siphons | formed by fusion of the edge of the mantle and this allows clams to feed and obtain oxygen while buried in sediment. |
| bysal threads | that attach them too rocks and other surfaces. |
| biofouling | the undesirable accumulation of organisms that settle on the bottoms of boat,piling,and other submerged . |
| ink sac | produces a cloud of dark fluid. |
| pen | embedded in the upper surface of the mantle. Shell is reduced to this. |
| crystalline style | an enzyme-secreting rod in the stomach. Continually rotates food to help in its digestion. |
| open circulatory system | a system were blood flows out of vessels into open blood space. |
| ganglion | cluster of nerve cells located in different parts of the body. |
| spermatophores | elongated packets of sperm,to the female. |
| veliger | a planktonic larva that has a tiny shel |
| valves | enclosed in a shell with two parts. |