1	Disk covered by scales and granules (Fig. 11a, e)	2
–	Disk covered only by scales (Fig. 12a). Four to 6 arm spines, ventral spines longest and slightly curved	Ophiopsila hartmeyeri
2	Dorsal arm spines robust and broadened (Fig. 11d). Two tentacle scales	Ophiocoma echinata
–	Dorsal arm spines long and slender (Fig. 11h). One tentacle scale on first arm segments	Ophiocoma wendtii