Echinodermata

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Echinodermata Part III
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Subphylum Echinozoa Class Echinoidea Regular
echinoids
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In the perisome Periproct region
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Subphylum Echinozoa Class Echinoidea Irregular
echinoids
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Echinoid ecology. In burrowing echinoids, note
specialized long, specialized tube feet used for
keeping a funnel to the surface of the substrate
open and for digging and packing a sanitary
drain for fecal material.
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Subphylum Echinozoa Class Holothuria Sea cucumbers
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Subphylum Asterozoa Class Asteroidea starfish
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Subphylum Asterozoa Class Ophiuroidea Brittle star