Topic 25 Deuterostomia

Question 1

Deuterostomia is part of

Answer 1

Bilateria

Question 2

Clade Deuterostomia consists of three phyla:

Answer 2

Hemichordata (acorn worms), Echinodermata (echinoderms, incl. starfish and sea urchins), and Chordata (chordates, incl. vertebrates).

Question 3

Deuterostomes undergo ____ embryonic development

Answer 3

deuterostome

Question 4

Clade Deuterostomia is defined by

Answer 4

molecular phylogeny

Question 5

Echinoderms

Answer 5

include starfish (or sea stars), brittle stars, sea urchins, sea lilies, and sea cucumbers.

Question 6

Echinoderms are slow-moving or ____ marine animals

Answer 6

sessile

Question 7

Most adult echinoderms have ____ symmetry

Answer 7

radial symmetry

Question 8

Echinoderm larvae exhibit ___ symmetry

Answer 8

bilateral

Question 9

Echinoderm have a thin epidermis covers an

endoskeleton of

Answer 9

ossicles

Question 10

Echinoderms water vascular tissue

Answer 10

unique water vascular system, 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

Question 11

madreporite.

Answer 11

echinoderms connected to seawater via a porous ossicle,

Question 12

Do echinoderms have a central nervous system?

Answer 12

no

Question 13

Examples of existing echinoderms

Answer 13

asteroida (starfish), echinoidea (sea urchins and sea dollars) and Holothuroidea (sea cucumbers)