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 | Y* | Y |
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 |
Copyright (c) 2007 by A. Richard Palmer. All rights reserved.
(revised Jan. 28, 2007)