Exam 22: Chaetognaths, echinoderms, and Hemichordates

Echinoderms are

Chaetognaths are also known as ______ ______.

The ___________ ___________ was formerly thought to be a notochord.

Ecologically,sea stars are at what trophic level?

Hemichordates do not have a kidney,but they do have a single _____________.

Arrow worm reproduction and development involves

A system of unknown function consisting of tissue strands enclosing unlined channels is the __________ system.

The pores leading to both the protocoel and paired coelomic cavities of the enteropneust hemichordates allow

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

In echinoderms,the main coelomic compartment is

If the radial nerve in an arm is cut,the podia in that arm lose coordination;if the circumoral nerve ring is cut,podia in all arms are uncoordinated and movement ceases.This indicates that

The hemichordates and echinoderms apparently form a sister group to the ________________.

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

The water vascular system is derived embryologically from the left _______ ________ ________.

The respiratory tree of a sea cucumber is

The designation of hemichordates as primitive chordates in 1885 by Bateson has proved

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

The role of the hemal system is best described as

How do the tube feet of sea stars and sea urchins operate?

Tube feet run along the ___________ groove that extends along the oral side from the mouth to the tip of each arm.