FiltersDone

Question type

Essay

Multiple Choice

Short Answer

True False

Matching

Exam 16: Ambulacraria: Echinoderms and Hemichordates

Show Answer

Share

---

All types

Filters

Study FlashcardsPractice ExamLearn

Question 21

Multiple Choice

Review LaterAdd Note

Review Later

Of the following structures found in sea stars,which one is also present in brittle stars?

A) pedicellariae
B) tube feet
C) dermal branchiae
D) aboral madreporite
E) ampullae

Correct Answer

verified

Show Answer

Question 22

Multiple Choice

Review LaterAdd Note

Review Later

Basket stars and brittle stars belong to the echinoderm class

A) Asteroidea.
B) Echinoidea.
C) Crinoidea.
D) Holothuroidea.
E) Ophiuroidea.

Correct Answer

verified

Show Answer

Question 23

Multiple Choice

Review LaterAdd Note

Many echinoderms from this class produce toxins in their body walls that discourage predators.

Attached crinoids are called

The common name acorn worm is derived from the appearance of the __________ of these worms.

The name Echinodermata translates as

Modern adult echinoderms have a form of symmetry known as

Sea cucumbers respire using

All of the following are true of members of the Pterobranchia except one.

The __________ are found on the oral surface of the arms of the sea star and house the tube feet.

Sea daisies have a thin membrane,the __________,that digests and absorbs nutrients.

The __________ serves as an inlet into the water vascular system.

The ciliated larva of an acorn worm is called the

The characteristic larva of the echinoids is the

Members of the echinoderm class __________ are called sea stars.

Unlike sea stars,in ophiuroids,the tube feet are extended by

Ambulacrarians and chordates are united into the clade Deuterostomia.In addition to sharing deuterostome characters like radial cleavage and an anus that forms in the region of the embryonic blastopore,the validity of the clade is supported by a wealth of molecular evidence.Another synapomorphy was once considered to be uniquely chordate,but now it is thought to have evolved very early in the deuterostome lineage and then lost in the echinoderm branch.This character is

Most modern echinoderms assume a mouth-down feeding and locomotion posture.Members of the class Crinoidea are an exception.They are attached,mouth-up,and feed using tube feet to trap food from the water column.Recent molecular analyses show the Crinoidea to be basal to other extant classes.Which of the following help to explain these observations?

Members of the phylum __________ include acorn worms and pterobranchs.

The madreporite in sea cucumbers is