Echinodermata

Question 1

What is the phylum?

Answer 1

Echinodermata

Question 2

What does Echinodermata mean?

Answer 2

spiny skin to bear

Question 3

What is the symmetry?

Answer 3

Pentaradial Symmetry

Question 4

What is the location of the nervous system?

Answer 4

Circumoral ring

Question 5

What does the endoskeleton have?

Answer 5

Dermal calcareous plates (ossicles)

Question 6

What system does it have?

Answer 6

Water Vascular System

Question 7

How does It move (locomotion)?

Answer 7

by tube feet, spine movement, or arm movement

Question 8

What is the digestive system like?

Answer 8

anus absent in ophiuroids (snake tail form - star brittle)

Question 9

Does it have a circulatory, respiratory, or excretory system

Answer 9

none

Question 10

What is reproduction likes

Answer 10

sexes separate & external fertilization

Question 11

What is the environment?

Answer 11

All marine

Question 12

What are the tentacle like projections that extends from the body surface?

Answer 12

Podia or tube feet

Question 13

What is the only complete system?

Answer 13

Digestive System

Question 14

What kind of symmetry does the larval stage have?

Answer 14

Bilateral

Question 15

List (in order) all parts of the water vascular system

Answer 15

Madreporite, stone canal, ring canal, radial canal, lateral canal, ampulla, tube feet, and suction cup

Question 16

Why do zoologists believe echinoderms evolved from bilateral ancestors?

Answer 16

1. both have bilaterally symmetrical echinoderm larval stages
2. both have extinct form that were not radially symmetrical

Question 17

Why is radial symmetry beneficial for slow moving organisms like echinoderms?

Answer 17

allows uniform distribution of sensory, feeding, and other structures around the animal