Author: (Poll & van Mol, 1966)
FBname: Deroy's cuskeel
Comments: Inhabits rocky crevices (Ref. 11482).  Two paratypes that were collected at low tide between blocks of lava in about 50 cm of water, were observed to move slowly close to the sand bottom.  Experiments that were carried out  showed that <i>O. deroyi</i> can tolerate a wide
  variation in salinity, but not the low salinity in which <i>O. galapagosensis</i> lives.  Consequently, there is an ecological barrier separating the two species.  Only about  five embryos were observed in ripe females (Ref. 57883).