Set 17

Question 1

what phylum are spiny skinned animals

Answer 1

echinodermata

Question 2

Distinct echinoderm features

Answer 2

radial symmetry and penramerous. 
Endoskeleton.
Blood system open.
Complete gut. 
No complex sense organs.

Question 3

Unique water vascular system

Answer 3

coelomic canals and tube feet projections with multiple functions

Question 4

Echinoderm madreporite is wheree

Answer 4

water enters/exits

Question 5

Echinoderms have a radial nervous system which

Answer 5

nerve ring with a nerve net and radial nerves in arms

Question 6

Unusual for complex animals…continuous growth is called

Answer 6

indeterminate…can shrink or grow depending on resource availability

Question 7

Fleshy epidermal projections increase surface area for gas exchange and excretion of NH3

Answer 7

Dermal papulae

Question 8

Echinoderm reproduction

Answer 8

Mostly dioecious, spawning of gametes, external fertilization, bilateral larvae

Question 9

Bipinnaria is what

Answer 9

a type of sea star larvae

Question 10

Examples of phylum echinodermata

Answer 10

sea stars/starfish.
sea urchins, sand dollars
brittlestars, basketstars. 
sea cucumbers
sea lilies, feather stars.

Question 11

facts of starfish

Answer 11

pentamerous, tube feet on oral side, anus on aboral side, voracious predators (evert stomach)

Question 12

facts of sea urchins and sand dollars

Answer 12

feet get bent upward. 
globular or disk shaped no arms.
ossicles are fused ... rigid "test"
five grooves with tube feet extending upward.
study fertilization and development.

Question 13

How do sea urchins and sand dollars feed

Answer 13

with aristotles lartern.

main herbivores on reefs.

Question 14

facts of brittle stars and basket stars

Answer 14

well defined central disk.
arms can MOVE.
incomplete digestive system (no separate anus).
madreporite on ORAL surface

Question 15

facts of feather stars and sea lilies

Answer 15

flower shaped, sessile, stalked.
long arms and crawl around. 
branches with food grooves with tube feet. 
filter feeders. 
no madreporite or spines

Question 16

Facts of sea cucumbers

Answer 16

elongated no arms.
microscopic ossicles in soft dermis.
tube feet on ventral surface. 
tube feet modified as feathery feeding tentacles.
respiratory tree