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Bio 122 Test 3
echinoderms (tan packet)
15
Biology
Undergraduate 1
04/02/2014

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Term
Which of the following is not true of echinoderms?
A. life cycle includes motile larvae and sedentary adult
B. they have a tough outer epidermis
C. they have skin gills
D. they have ossicles
E. they are pentaradially symmetrical
Definition
B
they actually have a very thin epidermis
Term
skin gills
Definition
on outer epidermis of echinoderms, how starfish take in oxygen
Term
cardiac stomach
Definition
digestive system of echinoderms that may be everted out of the mouth
Term
Which of the following is true of echinoderms?
A. are hermaphroditic
B. have sessile larvae
C. exchange water through ossicles
D. have nerve rings
E. have cephalization
Definition
D.
have separate sexes, motile larvae, exchange water through madreporite, do not have cephalization
Term
madreporite
Definition
used to exchange water in echinoderms
Term
water vascular system
Definition
how echinoderms circulate sea water and move tube feet
Term
ossicles
Definition
skeleton of echinoderms, calcareous, often spiny
Term
have tube feet
Definition
echinoderms
Term
is fertilization of echinoderms internal or external
Definition
external
Term
crinoidea
Definition
sea lilies and feather stars
Term
ophiuroidea
Definition
brittle stars
Term
echinodea
Definition
sea urchins
Term
holothuroidea
Definition
sea cucumbers
Term
asteroidea
Definition
sea stars (asteroids!)
Term
has a respiratory tree, cloaca, and can eviscerate when disturbed
Definition
holothuroidea (sea cucumbers)
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