W7 Animal Details

Echinoderms

Echinoderm type of coelom?

True coelom

Echinoderm type of skeleton?

endoskeleton

What feature is unique to Echinoderms?

Water-vascular system

Echinoderm symmetry

Secondary radial symmetry: larva exhibit bilateral symmetry, adults exhibit (penta)radial symmetry

Echinoderm coordinating center

Nerve ring

Echinoderm respiration structures

dermal branchiae, tube feet, respiratory tree, bursae

Aboral

Anus side

Echinoderm cephalization

None

List 4 characteristics of echinoderms that make them so unique from other phyla

1. Water-vascular system

2. Calcareous endoskeleton

3. Secondary radial symmetry: larva bilateral, adults radial

4. Adult pentaradial Symmetry (5)

What 5 clades fall under Echinodermata?

1. Holothuroidea

2. Echinoidea

3. Asteroidea

4. Ophiuroidea

5. Crinoidea

Holothuroidea

Sea cucumbers

Echinoidea

Sand dollars, sea urchins

Asteroidea

Sea stars

Ophiuroidea

Brittle stars, basket starts (snake form)

Crinoidea

Sea lilies, feather stars