Phylum Echinodermata

Question 1

Class Asteroidea

Answer 1

sea stars, sunflower stars

Question 2

Class Ophiuroidea

Answer 2

brittle stars, basket stars

Question 3

Class Echinoidea

Answer 3

sea urchins, sand dollars, sea buscuits

Question 4

Class Holothuroidea

Answer 4

sea cucumbers

Question 5

Class Crinoidea

Answer 5

sea lillies

Question 6

symmetry

Answer 6

radial

Question 7

skeleton type

Answer 7

calcareous skeleton

Question 8

papulae

Answer 8

skin gills used for gas exchange

Question 9

water vascular system

Answer 9

controls tube feet and gas exchange

Question 10

what is an oral surface in sea stars (bottom side)

Answer 10

has mouth, tube feet, and abulacural grooves

Question 11

what is an aboral surface in sea stars (top side)

Answer 11

have papulae

Question 12

abrulacral groove

Answer 12

helps with gas exchange (respiration)

Question 13

pedicellaria

Answer 13

small jaw

Question 14

sea star cardiac stomach (external)

Answer 14

is thrown outside the body to secrete a digestive enzyme that pries a clam shell open

Question 15

sea star pyloric stomach

Answer 15

digests whatever food is caught by the cardiac stomach

Question 16

test

Answer 16

fused skeletal ossicles in Echinoideas

Question 17

aristotle’s lantern

Answer 17

5 converging teeth to eat

Question 18

describe protection in a sea cucumber

Answer 18

spit water, poisonous skin, spit guts on their enemies