"This doesn't look to me like Aldisa pikokai. Aldisa pikokai always has 3 dorsal "craters" along the middorsal line, one just in front of the rhinophores, one just behind them, and one just in front of the gills. These craters always have darker spots within them. See some of the type specimens at http://www.underwaterkwaj.com/nudi/hawaii/h123.htm.
The species pictured looks more like one of the forms of Sclerodoris tuberculata with its single middorsal crater and somewhat rugose body. See http://www.underwaterkwaj.com/nudi/cryptobranchs/e077.htm and http://www.underwaterkwaj.com/nudi/hawaii/h209.htm.
Thanks.
Scott"