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Echinoderm Means ??
Spiny skin
only about 80 spicies of echinoderms are
sessile
echinderms have a ____ composed of _____ ____ plates called _____
endo-skeleton, calcium carbonate, ossicles
Echino's contain a _____ _____ _____ , network or hydraulic canals which branch into
extensions called _______ _____
water vascular system, tube feet
tube feet function in _____, _____, _____, and _____
movement, feeding, respiration, and excretion
echino;s are true
coelomates
they have a ___ ___ that circles the mouth and a ___ ____ that runs the length of each arm(in
starfish)
nerve ring, radial nerve
animals where the mouth develops first
protosomes
echinos are______
deuterostomes
echinos carry out ____ fertilization
external
there are about ____ species of echindoerms
7,000
class Asteroidea contains the ____ ____
sea stars
class Ophiuroidea contains ____ ____
brittle stars
brittle stars don,'t have an ____
anus
class Echinoidea contains ____ ____
regular sea urchin , and irregular sea urchins (sand dollars)
echinoidea lack ____
arms
class holothuroidea contains __ ______
sea cucumbers
class crinoidea contains _____ ____and ____ ______
sea lillies and feather stars