Examples from the Web for echinoderm
Half a dozen varieties of these are known, one of which inhabits an echinoderm, another a decapod crustacean.Animal Parasites and Messmates|P. J. Van Beneden
This is almost established also for Amphioxus, the Echinoderm Volvox, and other animals.The Ethics of Medical Homicide and Mutilation|Austin O'Malley
There are thus indications that in two important points the Echinoderm larv are more primitive than the Pilidium.
There seems to be little or no literature on the central nervous system of this form of echinoderm.
Tornaria (fig. 229) cannot be definitely united either with the Trochosphere or with the Echinoderm larval type.