Goniobranchus sp. #5
about 70 mm.
lightly "stained" with salmon. There is a red,
reticulate pattern in the mid-area of the notum and
the lateral portion contains large red spots. The
margin is ringed in yellow. The rhinophores are
yellow to yellow-orange and the gills are white with
red-edged pinnae. The notum is decorated with low,
conical pustules that distinguish it from the
similar appearing Goniobranchus
sp. #1. It is distinguished from Goniobranchus
petechialis by its lighter notum and
is a common, diurnal species seen on rocky bottoms
from < 1 to 15 m (< 3 to 49 ft) at Midway and
Kure atolls. Recently, Anthony Kuntz found one at a
highly exposed, rocky site on Niihau. Also, David
Rolla found two at Pupukea on Oahu (another exposed site). One of those
animals was under a ledge at about 12 m (40 ft). (Note 1)
Midway and Kure.
sp. #5 appears to be closely related to G. petechialis
(there is some possibility it might ultimately prove
to be a color form of that species) and both are
part of the Indo-Pacific Goniobranchus tinctoria complex. It's listed in Hoover, 2006 (5th printing) as Chromodoris sp.
2 and is referred to as the "Midway nudibranch."
PF: Midway; May 29, 1998.
There were no main island records till the Niihau animal in 2011 and
the Oahu animals in 2016 and 2018. Introduction seems unlikely. So, perhaps, this
species is moving "down chain" due to changes in water temperature?