Unformatted text preview: mouth is a new second opening). Phylum Echinodermata: Members of this phylum are secondarily radially symmetrical eucoelomate deuterostomes which develop from bilateral larvae. The echinoderms are all marine, have calcareous endoskeletons, and display respiratory/locomotory/feeding appendages called tube feet ( podia ). We will examine four echinoderm classes. Class Asteroidea (sea stars, sea star) Generally flattened echinoderms with central disk not sharply delineated from arms; arms having open ambulacral grooves; carnivores or scavengers. Can you see suction disks on the tube feet? Do any of the specimens show regeneration of arms? Class Ophiuroidea (brittle stars) Generally flattened echinoderms with central disk sharply delineated from arms; arms with closed ambulacral grooves; scavengers or filter feeders. How do these organisms differ from members of the Class Asteroidea?...
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- Fall '11
- Biology, sea star, Deuterostome, deuterostomes