Deuterostomia

Question 1

Three Phyla of Feuterostomia

Answer 1

Hemichordata
Echnodermata
Chordata

Question 2

Deuterostome Embryonic Development

Answer 2

Radial, indeterminate cleavage, coelom forms from folds in the mesdorm

Anus forms from the blastospore

Question 3

Echinoderms

Answer 3

Se star or starfish

Slow moving, sessile marine animals with radial symmetry at adulthood

Question 4

What did Echinoderms evolve from?

Answer 4

Bilateral ancestors

Question 5

Echinoderms Epidermis Features

Answer 5

Thin epidermis that covers and endoskeleton of ossicles (calcareous plates and spines embedded in the derms

Question 6

Echinoderms Vascular System

Answer 6

Derived from the coelom and consists of a ring canal in the central disk and a network of hydraulic canals running down the length of each arm

Connected to seawater via a porous ossicle which allows water to flow in and out

Question 7

Echinoderm Reproduction

Answer 7

Sexual reproduction where gametes are released into the water for external fertilization

Question 8

Three Main Echinoderms Clades

Answer 8

Asteroidea

Echinoidea

Holothuroidea

Question 9

Asteroidea

Answer 9

Echinoderm Clade including starfish

Mouth on the underside, 5+ radiating arms from a central disk, can regrow limbs

predators of molluscs

Reproduce asexually by fission

Question 10

Echinoidea

Answer 10

Clade of Echinoderm

Urbins and sand dollars with no arms but five rows of tube feet

Slow-moving, use jointed spines to move

Herbivorous

Question 11

Holothuroidea

Answer 11

Clade of Echinoderm

sea cucumbers with tube shaped detritivores

Deposit filter feeders

Appear bilaterally symmetrical, but actually are elongated along the anterior-posterior axis.

Lack external spines and have endoskeleton of reduced scattered ossicles