Phylum Echinodermata

Question 1

Phylum Echinodermata:

Answer 1

• Sea stars, brittle stars, sea urchinis,

Question 2

Charactereristics

Answer 2

• Includes sea starts(star fish), brittle stars (serpent stars), sea urchins, sea cucumners, sea lillies
• Deuterostome development
• Radial symmetry in adult ,but
• Bilateral symmetry in larvae
• “Spiny skin”

Question 3

Phylum Echinodermata

Class ateroida:

Answer 3

The sea stars (star fish)
- Star-shape;anatomy and body plan; spines and pedicellariae; multirayed sea stars; feeding mechanism; autotomy and regeneration
- Sea star feeding-

Question 4

Class Ophiuroidea

Answer 4

• The brittle stars(sepernt stars)
• thin-armed, star shape; anatomy and body plan; autotomy and regeneration

Question 5

Class Echinoidea

Answer 5

• the sea urchins
• ## Globose shape; anatomy and body plan; the green sea urchin(strongylocentrotus droebachiensis), as an example of reproduction, feeding mechanism (Aristotles’s Lantern)

Question 6

Class Holothuroidea

Answer 6

• The sea cucmbers
• Elongate shape; anatomy and body plan; the sea cucumber cucumaria Frondosus, as an example; feeding mechanism

Question 7

Class crinoidea

Answer 7

• the sea lillies
• flower shape; anatomy and body plan; feeding mechanism; importance in fossil record

Question 8

The classes of Echinoderms

Subphylum Echinozoa

Answer 8

• Class Echinoidea
• Class Holothuroidea
• Class Edrioasteroidea
• Class Helicoplacoidea
• Class Ophiocistoidea

Question 9

The classes of Rchinoderms

Subphylum Asterozoa

Answer 9

• Class Asteroidea
• Class Ophiuroidea