Halgerda bacalusia
Fahey & Gosliner 1999
Order: NUDIBRANCHIA
Suborder: DORIDINA
Superfamily: EUDORIDOIDEA
Family: Dorididae
DISTRIBUTION
Known only from Thailand [Andaman Sea] and Mindanao [Philippines].
PHOTO
Holotype, 40mm long preserved. Richelieu Rock, Thailand, Andaman Sea, 28m, November 1997. PHOTO: Mark Strickland.
H. bacalusia has pronounced orange ridges linking the large orange-capped tubercles. The mantle edge and margin of the foot are bright yellow-orange. The straw coloured rhinophore clubs have a black band down each side, and there is a black line down the posterior midline of the transparent rhinophore stalk. The translucent gills are edged in diffuse black pigment.
H. bacalusia has similarities to a number of other species of Halgerda with orange ridges and spots. Halgerda carlsoni differs in having a mantle border of orange spots rather than a yellowish band. Halgerda aurantiomaculata differs in lacking the many small orange spots scattered ober the margin and in having a deep orange mantle margin. Halgerda diaphana also has similarities but has a few orange streaks between the ridges rather than many small orange spots.
Reference:
•Fahey, S.J. & Gosliner, T.M. (1999) Preliminary phylogeny of Halgerda (Nudibranchia: Halgerdidae) from the Tropical Indo-Pacific with descriptions of three new species. Proceedings of the California Academy of Sciences, 51(11): 425-448.
Rudman, W.B., 2000 (April 18) Halgerda bacalusia Fahey & Gosliner 1999 . [In] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/halgbaca
Related messages
Halgerda bacalusia from Thailand
January 25, 2001
From: Erwin Koehler
Dear Bill,
Here is a Halgerda bacalusia from Thailand,
Koh Ha Noi, divesite "Koh Ha Noi", depth 17m, size 52mm, Dec. 27, 2000
Erwin
Medslugs.Koehler@t-online.de
Koehler, E, 2001 (Jan 25) Halgerda bacalusia from Thailand. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/3609Thanks Erwin,
Bill Rudman
Halgerda bacalusia from Thailand
January 5, 2001
From: Gordon T. Smith
Dear Bill,
Happy New Year. Here is a picture of a Halgerda species that I took in Thailand a couple of years ago. Size approx 2.5cm, Depth 10 metres. December, 1988, Andaman Sea. Just wondering if you can identify further. Incidentally thanks to your site I have been in touch with a fellow diver / photographer Carole Harris here in UAE whom I have not seen in at least a year.
Best Regards
Gordon
aquashot@emirates.net.ae
Smith, G.T., 2001 (Jan 5) Halgerda bacalusia from Thailand. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/3476Dear Gordon,
Thanks for the nice photo. It is Halgerda bacalusia which was only described a year or so ago from Thailand and the Philippines.
Best wishes,
Bill Rudman
Halgerda bacalusia from Thailand
April 19, 2000
From: Bill Rudman
Mark Strickland has kindly given me permission to use his photographs of Halgerda bacalusia and his namesake Halgerda stricklandi so I have prepared a new page on H. bacalusia and upgraded the page on Halgerda stricklandi.
Best wishes,
Bill Rudman.
