any marine animal of the invertebrate phylum Echinodermata, having a radiating arrangement of parts and a body wall stiffened by calcareous pieces that may protrude as spines and including the starfishes, sea urchins, sea cucumbers, etc.
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It was at first thought that we had before us an echinoderm in the act of transformation.
He considers the Rotifers to be "the permanent forms of Echinoderm larvæ."
There seems to be little or no literature on the central nervous system of this form of echinoderm.
A resemblance to the other Echinoderm larvae is found in the fact that coelomic diverticula of the enteron are present.
Half a dozen varieties of these are known, one of which inhabits an echinoderm, another a decapod crustacean.