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Exam 14: Chaetognaths, Echinoderms, and Hemichordates

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Question 21

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It is generally accepted the ancestral deuterstome was a marine bilateral free-moving form with _____________.

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Question 22

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The common name for the enteropneusts is _____________.

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Question 23

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Characteristics of the hemichordates that are shared with the chordates are the ____________ and ______________.

Sea stars

The respiratory tree of sea cucumbers opens into the ________________.

Minute,pincer like _________________ are found on the surfaces of many sea stars.

The madreporite of asteroids leads directly the radial canals.

Of the echinoderms,regeneration and autotomy are most pronounced in the

The anus of asteroids is located on the aboral side of the animal.

When a sea star feeds on a clam,it inserts its _____________ between the two valves.

The ophiuroids have no

Water for suspension feeding in the hemichordates is driven by ____________.

The Chaetognatha appear to be morphologically similar to deuterostomes,but in fact may be __________________.

Brittle stars move rapidly for echinoderms.

The basic five arms of crinoids are usually branched to form many more,each of which bears barb-like _____________.

A system of unknown function in echinoderms,consisting of tissue strands enclosing unlined channels is the ______________ system.

Acorn worms

Combinations of characteristics only found in the Phylum Echinodermata are ossicles,water-vascular system,and pedicellarie.

One of the principal functions of the tube feet in brittle stars is ___________.

Echinoderms