Gymnodoris citrina (Bergh, 1875)
|Maximum size: 30 mm.
This species is cream with orange spots. It is very
similar to Gymnodoris bicolor. However, its
genital pore is located well forward of the branchia rather than
behind them. The branchia form
a complete circle around the anus and the corners of the oral tentacles are more angular than in G. bicolor. Its oral tentacles are
much broader than in Gymnodoris sp. #2.
is a moderately rare species found in moderately protected to exposed
rocky habitats from < 1 to 6 m (< 3 to 20 ft). It's a voracious
predator of other Gymnodoris
spp and is also cannibalistic (see Scott
Johnson's account on the Sea Slug Forum).
Maui and Oahu: widely distributed in the Indo-Pacific.
It was first recorded in Hawaii from near Nanakuli, Oahu by Hans
Bertsch on June 2, 1977.
Ahihi Bay, Maui; Nov. 5, 1999.
Observations and comments:
1: In fall, 1993 a G. citrina ate a smaller Gymnodoris when they were left
together in a holding dish. (see
photo) On Nov. 5, 1999, a G.
citrina ate another Gymnodoris
(perhaps also a G. citrina?)
on the way back to shore while both were in a collecting vial. Later,
the same animal ate a Gymnodoris
okinawae while in a holding dish.