Coelomates: Protostomes and Deuterostomes Protostomes have ...
Coelomates: Protostomes and Deuterostomes Protostomes have ... Coelomates: Protostomes and Deuterostomes Protostomes have ...
Endoskeleton is made of calcium carbonate plates that form internally Possess a unique water vascular system - a hydraulic system to aid movement and circulation Mouth opens ventrally in most - anus is dorsal Adults have no head or brain Nervous system composed of circular nerve ring and radial branches Sexes are separate Fertilization is external Gonads (ovaries and testes) found in arms
Echinoderms exhibit radial symmetry as adults - but have a bilaterally symmetric larva Transform to pentaradial symmetry as they mature Radial symmetry works well for sessile organisms - primitive echinoderms (like sea lilies) are sessile Bilateral larva thought to indicate that they originated from a bilaterally symmetric ancestor - original ancestor is uncertain
- Page 1 and 2: Coelomates: Protostomes and Deutero
- Page 3: Phylum Echinodermata - Echinoderms
- Page 7 and 8: Operation of the water vascular sys
- Page 9 and 10: There are Six Living Classes of Ech
- Page 11 and 12: Class Asteroidea - Sea Stars the fa
- Page 13 and 14: Class Echinoidea - Sea Urchins and
Endoskeleton is made of calcium carbonate plates that form internally<br />
Possess a unique water vascular system - a hydraulic system to aid<br />
movement <strong>and</strong> circulation<br />
Mouth opens ventrally in most - anus is dorsal<br />
Adults <strong>have</strong> no head or<br />
brain<br />
Nervous system<br />
composed of circular<br />
nerve ring <strong>and</strong> radial<br />
branches<br />
Sexes are separate<br />
Fertilization is external<br />
Gonads (ovaries <strong>and</strong><br />
testes) found in arms
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