Exam 22: Chaetognaths, Echinoderms, and Hemichordates

During metamorphosis of sea stars,the left side of the larva becomes the oral surface of the adult,and the right side becomes the ___________ surface.

The excretory system of an enteropneust hemichordate (or acorn worm)consists of

The common name for chaetognaths is

The basic five arms of crinoids are usually branched to form many more,each of which bears barblike ___________.

The early embryology of hemichordates is much like that of the ___________________.

Which of the following are considered "irregular" urchins?

The most active of all echinoderms are the

Arrow worm anatomy

The fossil record of echinoderms

The mouth of the brittle star is surrounded by five movable plates that serve as ___________.

Hemichordates were not recognized until the 1800s because they

Sea stars reproduce mostly

The role of the hemal system is best described as

________________ larvae of nonbrooding echinoids may live a planktonic existence for several months and then metamorphose into young urchins.

The larva of enteropneust hemichordates is known as a ________________.

The orientation of a sea star is

Hemichordates are marine animals that were formerly considered a subphylum of ____________.

Superphylum Ambulacraria contains two deuterostome phyla: Echinodermata and ____________.

If you went to the ocean and brought back a sea star to keep in a marine aquarium,what would you feed it?

A calcareous sieve leading to the watervascular system is the ________________ or sieve plate.