mollusks, cephalopods and echinoderms vocab

visceral mass

contain organs

radula

mollusk tongue for scraping food

hemocoel

coelomate body cavity for mollusks

protostomes

forms mouth before anus

mantle

mollusks tissue covering visceral mass that excrete shell as well

siphons

bivalves breathing tube

cephalopod

“head foot”

bivalves

“2 part shell”

jet propulsion

a way to move by sucking and shooting water

chitinous beak

used to break food like clams in cephalopods

radula

tongue/teeth along with beak

chromatophores

pigment cells

deuterostomes

anus develop before mouth

water vascular system

echinoderm tube feet uses ampulla to pump water for locomotion

asteroidea

sea stars

pedicellaria

colorful surface that has pincers to free arm from algae

sieve plate

bony structure with pores on top of starfish

central radial nerve ring

main nerve on starfish

ossicles

internal bony part of starfish endoskeleton