Ophiuroidea - PowerPoint PPT Presentation

Phylum Echinodermata

Phylum Echinodermata. Greek “ echinos ” spiny “derma” skin. Main Characteristics. Radial symmetry: PENTARADIAL Bilateral in free swimming embryonic stages. Skeleton . endoskeleton made of tiny calcareous plates and spines (OSSICLES) Acts like exoskeleton but it’s NOT!

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Phylum Arthropoda

Phylum Arthropoda. Phylum Arthropoda. Several million species. Hard exoskeleton. Phylum Arthropoda: Arthropods (crustaceans, spiders, insects) Hard exoskeleton, segmented bodies, jointed appendages

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Class: Ophiuroidea

Class: Ophiuroidea. Brittle Stars or Serpent Stars…. General Information. The most abundant echinoderms (about 2000 known species worldwide) Nocturnal Animals. Skeleton. Brittle stars have long flexible arms that attach to a central disk

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1.38k views • 6 slides

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