March 16, 2000
From: Atsushi Ono
Thank you for ID of Goniodoris glabra.
I have attached some Halgerda species.
The UPPER one is probably H. dalanghita.
I found them underside of a dead coral
at 10m depth, Kerama Is. near Okinawa.
The bigger animal is 30mm long. This species is very rare, I have seen only these two individuals here.
LOWER LEFT is probably H. diaphana.
This size is about 40mm long. I found this at 20m depth crawling a rock, Kerama Is. near Okinawa. This is common species here in winter to early summer. I have seen over 30 individuals,
LOWER RIGHT is probably a juvenile of H. diaphana. This is about 5mm long, found at 7m depth underside of a dead coral.
A juvenile is very rare... I have seen only this one.
Could you check these photos?
Ono, A., 2000 (Mar 16) Three? species of Halgerda from Kerama Island. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/2094
I think you are correct with your identifications of H. dalanghita and the larger H. diaphana. I am not however sure of the third juvenile specimen.
Could it possibly be H. guahan?. I don't know if that species has any sign of orange at the mantle edge, and I don't know if the black spots on the gills and rhinophores are proportionally larger in juveniles. Fortunately Clay Carlson & Patty Jo Hoff, who described that species will set me straight if I am wrong.
[Note added March 19, 2000: See carlson & Hoff message identifying juvenile as H. diaphana.]Rudman, W.B., 2000 (Mar 16). Comment on Three? species of Halgerda from Kerama Island by Atsushi Ono. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/2094
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