Echinoderms Sea stars, sea urchins, and sea cucumbers belong to phylum Echinodermata (“spiny skin”, “hedgehog skin”) Exclusively marine Adult echinoderms.

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Post on 21-Dec-2015

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Slide 1 Echinoderms Sea stars, sea urchins, and sea cucumbers belong to phylum Echinodermata (spiny skin, hedgehog skin) Exclusively marine Adult echinoderms possess pentamerous symmetry; in which the body is arranged in five parts around a central axis No dorsal, ventral, anterior or posterior end; oral and aboral ends only Slide 2 Phylum Echinodermata Echinoderms have an internal skeleton, or endoskeleton covered by a bumpy, sometimes spiny, tissue layer Echinoderms have a network of water-filled canals connected to muscular tube feet, which extend when filled with water The vascular system connects to the outside environment via the madreporite on the aboral surface Slide 3 Phylum Echinodermata Slide 4 Types of Echinoderms Sea stars can regenerate missing body parts Brittle stars have long, flexible arms; most abundant group of Echinoderms Sea urchins have a round, rigid test Slide 5 Sea Urchin (class Echinoidea) Slide 6 Types of Echinoderms Sea cucumbers are worm-like; elongated along the oral-aboral axis, as if pulled/stretched from the mouth and anus Crinoids use outstretched, feathery arms to capture food particles from the water; includes feather stars and sea lilies

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