Phylum Echinodermata

Question 1

Common name

Answer 1

Echinoderms
“Prickly skin”

Question 2

Symmetry

Answer 2

Larva- bilateral
Adults- pentaradial
Triploblastic

Question 3

Coelom

Answer 3

Eucoelomate

Question 4

Skeleton

Answer 4

Endoskeleton
Calcium carbonate

Question 5

Organ systems

Answer 5

Water vascular system
Ossicles on skin
Pedicellaria- defensive organ
2 stomachs

Question 6

Habitat

Answer 6

Marine

Question 7

Reproduction

Answer 7

Dioecious
Fragmentation

Question 8

Fossil history

Answer 8

Diverse fossils from Mesozoic, Cambrian, and Paleozoic
Fewer species today

Question 9

Class asteroidea

Answer 9

Sea stars
Thick arms
Tube feet
Central disk
Inverted stomach
Mullusk carnivore

Question 10

Class ophiuroidea

Answer 10

Brittle stars
Thin long flexible arms for movement
Demarcated disk: smaller, no anus
Readily automize: drop arms

Question 11

Class echinoidea

Answer 11

Tube feet for movement
Detritivores
Aristotle’s lantern: mouth on underside
Sea urchins and sand dollar

Question 12

Class holothuroidea

Answer 12

Elongated axes
Respiratory tress’s
Tube feet for movement
Tentacles for feeding
Bilateral adults
Sea cucumbers

Question 13

Class crinoidea

Answer 13

Sessile
Branched arms
Suspension feeders. Tube feet for feeding
Sea lilies and feather stars