Biology Chapter 21 (pages 443-454)

31 terms by sarahsquiz 

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mollusks

soft-bodied, boneless water creatures

foot

used for locomotion

visceral hump

contains internal organs

mantle

a skinlike organ which covers the visceral hump, and in most species, produces a calcium carbonate shell for protection

pearl

when nacre builds up around an irritant

adductor muscles

the hinges that hold together the two shells of a bivalve mollusk

mantle cavity

open chamber in which the gills are located

incurrent siphon

takes water into the mantle cavity to the gills

excurrent siphon

where water that has passed through the incurrent siphon exits the body

gastropods

also called univalves - have a single shell

slugs

gastropods which look like snails without shells

nudibranches

sea creatures which have brilliant colors and elaborate plumelike gills

bivalves

two-shelled

radula

a rough, file-like organ in mouth that scrapes food and carries it like a conveyor belt into the digestive tract

giant squid

largest invertebrate

nautilus

only cephalopod with an external shell

echinoderms

spiny-skinned sea animals

watervascular system

a complex system of water-filled tubes that extends throughout the body

rays

the arms of starfish

eyespot

at the end of each starfish ray

tube feet

on the underside of starfish rays; appear in two double rows

rotifers

microscopic invertebrates found in freshwater lakes and ponds

parthenogenic

eggs that require no fertilization

cnidocytes

stinging cells

polyp

a cylindrical body type for coelenterates

medusa

a free-swimming, umbrella-shaped body type which has its mouth facing downwards

sea anemone

"flower" of the ocean

corals

colonial coelenterate

coral reefs

when limestone cups of many corals eventually form together into these limestone structures

excurrent pore

the opening by which water leaves a sponge

incurrent pores

the tiny openings by which water enters a sponge

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