Topic 25: Deuterostomia

Question 1

Clade Deutrostomia

Answer 1

A part a clade bilateria, phylum Echinodermata and phylum Chordata, shares deuterostome embryonic development.

Question 2

Phylum Echniodermata

Answer 2

Starfish, sea urchins, sea cucumbers.

Question 3

Characteristics of Echniodermata

Answer 3

Radial Symmetry (pentaradical), Sessile, the epidermis covers an endoskeleton of ossicles, has a water vascular system, diffuse nervous system w/o central brain, separate sexes.

Question 4

Water Vascular System

Answer 4

A hydraulic system for locomotion and feeding that is derived from the coelom and consists of a ring canals, tube feet, and madreporite.

Question 5

Asteroidea

Answer 5

Starfish w 5 or more arms, predatory by prying open molluscs w/ tube feet and evert stomach onto prey to engulf them.

Question 6

Echniodea

Answer 6

Sea urchins w/ no arms, but 5 rows of tube feet, slow-moving herbivores that uses jointed ossicles for locomotion

Question 7

Holothuroidea

Answer 7

Sea cucumbers w/ elongated body plan that lack spines.

Question 8

Tube Feet

Answer 8

At the end of arms w/ ampulla and podium, used for suction

Question 9

Madreporite

Answer 9

Allows water flow to provide equilibrium, not radially symmetrical.