Chapter 7: Introduction to the animals

Which class is also called "flower animals"?

Anthozoa

Name the two clades of protostomes.

Ecdysozoa and Lophotrochozoa.

Diploblastic animals have which germ layers?

Ectoderm and endoderm.

Name this thick walled muscular structure found in the earthworm.

Gizzard

While exploring, you discover a hydrozoan called Hydra sp. Where did you find the Hydra sp.?

Pond

Which of the following is a characteristic of jellyfish?

Radial symmetry Incomplete digestive tract

Which of the following is TRUE of flatworms?

They have bilateral symmetry They have anterior and posterior ends They can be parasitic

This class of the Platyhelminthes consists of the parasitic flukes.

Trematoda

A medusa is often described as ______________.

an umbrella-shaped body with tentacles that hang down

While swimming in the ocean, you feel a sting on your leg from a Portuguese man-of-war. The sting was caused by ______________.

nematocysts

The word Porifera comes from a Latin word that means ______________.

pore-bearer

The central cavity of a sponge , the ______________, is lined with ______________.

spongocoel, choanocytes

Earthworms are monoecious, meaning _______________.

they possess both male and female organs