The adults are radially symmetrical but larvae exhibit bilateral symmetry in
Mollusca
Hemichordata
Echinodermata
Cephalochordata
As we have learned
Phylum Echinodermata -
Spimy or prickly skinned. (calcareous ossicles). Marine with some pelagic and few sessile. Bilateral symmetry in larvae and pentamerous radial in adults. Triploblastic and coelomate (enterocoelous).
- wherein
Eg. Asterias, Echinus, Antedon, Cucumaria, Ophiura.