Goniobranchus petechialis (Gould,
|Maximum size: 70
mm (Gosliner, et. al., 2008).
The rhinophores are yellow and the gills are white
with red lines on their inner and outer surfaces.
The notum is decorated with low, conical pustules
that distinguish it from the similar appearing Goniobranchus
sp. #1. It differs from Goniobranchus
sp. #5 in its darker background color and
spotted (as opposed to reticulate) notum.
petechialis is known from one animal found
at Honolulu in the 1800s (the basis of the 1852
description) and two animals photographed on Oahu in
1959. The 1959 animals may have come from Kaneohe
Bay, a shallow highly protected site.
from Hawaii in Gould, 1852 (as Doris petechialis) and appears to be closely
related to Goniobranchus
sp. #5 with both species being part of the
tinctoria complex. For further discussion
Sea Slug Forum. There is some possibility Goniobranchus sp.
#5 might ultimately prove to be a color form of G. petechialis.
The name means “blood vessel hemorrhages” referring
to the pattern on the notum. It's listed in most sources as Chromodoris petechialis although it is not the species listed under that name in Bertsch & Johnson, 1981, Kay, 1979 and Kay & Young, 1969.
Paul A. Zahl: animals probably from Kaneohe Bay,
Oahu; 1959: Photo courtesy of the National
Geographic Society. Copyright: National Geographic