Echinoderms

Question 1

Echinoderm

Answer 1

a marine invertebrate of the phylum Echinodermata, such as a starfish, sea urchin, or sea cucumber.

Question 2

Body

Answer 2

Pentaradial Symmetry )larvae are bilaterally symmetrical.

Question 3

Ossicles

Answer 3

Calcareous (calcium chalky) bones with many spines that makes the skeleton.

Question 4

Digestive system

Answer 4

Tube with Organs

Question 5

Cardiac Stomach

Answer 5

Stomach can go out the mouth to digest food (ie star fish).

Question 6

Tube Feet

Answer 6

small flexible hollow appendages protruding through the ambulacra, used either for locomotion or for collecting food

Question 7

Ambulacra

Answer 7

Radial Bands

Question 8

Water Vascular System

Answer 8

Circulates water for tube feet to move.

Question 9

Nervous System

Answer 9

Nerve ring surrounds the mouth with radial branches. No cephalization :(.

Question 10

Injuries

Answer 10

Can regenerate lost body parts.

Question 11

Ecology

Answer 11

Marine.

Question 12

Class Crinoidea

Answer 12

Sea lilies and feather stars (mouth up)

Question 13

Class Ophiuroidea

Answer 13

Brittle stars, five arms with tube feet for EATING!

Question 14

Class *Echinoidea

Answer 14

Sea Urchins- important scientifically and as food.

Question 15

Class Holothuroidea

Answer 15

Sea Cucumber- leathery skin, respitory tree opens to a cloaca. Can eviscerate.

Question 16

Eviscerate

Answer 16

Disembowel by the Holothuroidea (sea cucumber).

Question 17

Class Asteroidea

Answer 17

Star fish- five to many arms. Feed in bivalves (mollusk) with cardiac stomach. Keystone species.