Protostome Animals

The phylum that includes snails, clams, oysters, and octopuses:

• Cnidaria

• Annelida

• Mollusca

• Arthropoda

What is a defining characteristic of mollusks?

• They contain a mantle

• They live underwater

• They have antennae

• They have tube feet

Flatworms

• have a closed circulatory system

• move via a hydrostatic skeleton

• are coelomates

• breathe via simple diffusion

Annelids are

• segmented worms.

• insects.

• flatworms.

• arthropods.

Cnidaria (Jellyfish, Corals, Anemones) have stinging cells to capture prey.

• True

• False

Ctenophora (Comb Jellies) have stinging cells to capture prey.

• True

• False

How do Lophotrochozoans grow?

• incrementally, like laying down bands of shell

• molting an exoskeleton

• shedding a cuticle

• spontaneous generation

Flatworms are acoelomate animals.

• True

• False

The animal group with the most described species:

• flatworms

• insects

• annelid worms

• bivalves

Leeches are an example of a(n)

• ectoparasite

• endoparasite

• mutualist

• symbiote