Echinodermata, Mollusca, arthropoda

• Radial Symmetry

• Endoskeleton

• Hard, spiny skin.

• Sea stars, Sand dollars, and sea urchins

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​Echinodermata

• Soft bodied organisms.

• Bi-lateral symmetry

• Snails, slugs, clams, and octopus.

• Most have a hard shell.

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​Mollusca

Multiple Choice

Which part of the Mollusk body is the tissue covering the body and secretes the shell?

• Mantle

• Trochophore

• Foot

• Visceral Mass

Multiple Choice

Which part of the Mollusk body contains most of the organs?

• Foot

• Visceral Mass

• Trochophore

• Mantle

Multiple Choice

Mollusk's tongue-like strip covered with teeth that point backward is called the ____ Note: clams have labial palps but not this structure.

• trochopore

• radula

• gills

• visceral mass

Multiple Choice

Which of the following is true of all mollusks?

• they have shells

• they have soft bodies

• they have segments

• they have a closed circulatory system

Multiple Choice

What type of body symmetry do all adult echinoderms have?

• Bilateral

• Asymmetrical

• Radial

• All the above

Multiple Choice

What phylum do sea stars, sea urchins, sand dollars, brittle stars, and sea cucumber belong to?

• Animalia

• Annelida

• Echinodermata

• Mollusca

Multiple Choice

Echinoderms are the only marine invertebrates with this type of body structure: 

• Exoskeleton

• Adductor muscles

• Spicules

• Endoskeleton 

Multiple Choice

What does Echinodermata mean?

• Hard shell

• Many arms

• Soft bodied

• Spiny skin