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Phylum Echinoderms Classes: Crinoidea (sea lilies), Asteroidean (sea stars), Ophiuroidea (brittle stars), Exhninoidea (sea urchin & san dollars),...

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Biology

Phylum Echinoderms

Classes: Crinoidea (sea lilies), Asteroidean (seastars), Ophiuroidea (brittle stars), Exhninoidea (sea urchin &san dollars), Holothuroidea (sea cucumbers).

In short, compare and contrast traits of these classes suchdifference and similarity of their anatomy, water vascular system,gas exchange, body plan, development features, larval stages.

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Answer & Explanation Solved by verified expert
4.2 Ratings (593 Votes)
Echinoderms are invertebrates that have a pentaradial symmetrya spiny skina water vascular systemand a simple nervous system Crinoidasea lilies Sea lilies and feather stars are example of CrinoideaBoth of these species are suspension feedersThey live both in shallow water and depths as great as 6000 metersSea lilies refers to the crinoids whichin their adult formare attached to the sea bottom by a stalkCrinoids are charactarized by a mouth on a top surface that is surrounded by a feeding armsThey have a Ushaped guttheir bottom is located next to the mouthAlthough the basic echinoderm pattern of fivefold symmetry can be recognizedmost crinoids have many more than five armscrinoids usually have a stem attached to themselves to a substratebut many live attached only as juvaniles    See Answer
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