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Goniobranchus(?) sp. #6
 
Goniobranchus(?) sp. #6
Maximum size:  about 25 mm.

Identification:  This is an elongate-oval species with a few small, conical pustules on the notum. The central part of the notum has fine white reticulations on a yellow ground. The lateral portion of the notum has a yellow marginal line and a solid-white submarginal band. The rhinophores are clear and the branchia are yellow-orange with white tips.

Natural history:  The one known Goniobranchus(?) sp. #6  was found in a mixed habitat at a moderately exposed site. It was seen at night at a depth of about 7.6 m (25 ft).

Distribution:  Kauai:

Taxonomic notes:  This species was first recorded in Hawaii from Koloa Landing, Kauai by Jeremy Bricco on March 15, 2016. It's not a close match for young specimens of any of our listed Goniobranchus species (or reference photos from elsewhere in the Indo-Pacific). Nor, is it a close match for species in other genera (although Goniobranchus appears to be the most likely genus, there's still some uncertainty). (Note 1)

Photo:  Jeremy Bricco: about 25 mm: Koloa Landing, Kauai; March 15, 2016.

Observations and comments:

Note 1:  The pattern in the center of the notum is somewhat reminiscent of young Goniobranchus albopunctatus from elsewhere in the Indo-Pacific. However, photos on-line with lengths as low as 4 mm still show the adult coloration (which, otherwise, is very different from this animal). Some other features are close to the G. tinctoria group but without a close match.
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