Page 27 - SAAT BIOLOGY PART 1

SAAT BIOLOGY MR.MOHAMED ELGAYAR MRPROF.NET
developed calcium carbonate plates. Sea urchins have

a hard endoskeleton. Brittle stars have a hard

endoskeleton.

• Invertebrate Chordates

• The sea stars are predatory, feeding mostly on

mollusks.

• Sea cucumbers use a form of filter feeding

• Sea urchins feed on algae and sand dollars are filter

feeders.

• The crinoids are filter feeders.

• Both adult lancelets and tunicates use their gill slits for

filter feeding.

• The pedicellariae are small pincers present on the skin

of echinoderms.

• Tube feet are a part of the water vascular system.

• Spines are a part of the endoskeleton.

• Amplullae are muscular in nature.

MRPROF.NET MR.MOHAMED ELGAYAR MRPROF.NET@GMAIL.COM 26