FIG. 3. — Asterodiscides bicornutus n in A new species of Asterodiscides (Echinodermata, Asteroidea, Asterodiscididae) from the tropical southwest Pacific, and the biogeography of the genus revisited

FIG. 3. — Asterodiscides bicornutus n. sp., outline drawing of abactinal surface illustrating the positions of bicornute spines only, and the general alignment of the more dorsal of these into a carinal and two dorso-lateral rows (indicated by dotted lines). The anus (a) and madreporite (m) are included as reference points. A ring of dots on arm B marks the position of a missing spine whose identity, conical or bicornute, is not known.