Phylum Echinodermata - Arapahoe High School

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The Basics • Symmetry ▫ All echinoderms have pentaradial symmetry ▫ BUT… they develop from bilateral larvae • Body Openings ▫ Two, mouth & anus
Classifying Characteristics All echinoderms share several characteristics: • Endoskeleton made of plates called ossicles. ▫ Ossicles attached to spines or spicules protruding through the skin. ▫ Enchinoderm = “spiny skin” • Water Vascular System ▫ Network of water-filled canals inside body • Tube Feet ▫ Small extensions of the water vascular system • Aid in – feeding, movement, respiration, excretion • More closely related to Chordates than other Invertebrates ▫ Develop as deuterostomes rather than protostomes ▫ Larva develop with bilateral symmetry
Page 1: Phylum Echinodermata
Page 6 and 7: Classification 7,000 Species, 6 Cla
Page 8 and 9: Sea Lily Class Crinoidea • Exampl
Page 10 and 11: Class Echinoidea • Name means “
Page 12 and 13: Interesting Extras… • After wat
Page 14: HW Questions: 1. Explain two reason

Phylum Echinodermata - Arapahoe High School

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