ECHINODERMATA (II): Skeleton, coeloms (Echinoderm study images; |
TRAIT | Crinoid | Asteroid | Ophiuroid | Echinoid | Holothuroid |
---|---|---|---|---|---|
madreporite | multiple pores | aboral | oral | aboral | internal (to perivisc.) |
polian vesicles | N? | Y | Y | N? | Y |
ambulac. groove | open | open | covered | covered | covered |
tube feet suckers | N | Y/N | N | Y/N | Y/N |
podia penetration | between plates | between plates | between plates | paired, thru plates | between plates |
podia spacing | stagger | stagger | paired | stagger | stagger |
ampullae on podia | N | Y | N | Y | Y |
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Copyright © 2002 by A. Richard Palmer. All rights reserved.
(revised April 4, 2002)