Fahey & Gosliner, 1999
Tropical Indo-West Pacific.
Underside of a dead coral at 10m depth, Kerama Is. near Okinawa. The bigger animal is 30mm long. Inset showing colour of ridges. PHOTO: Atsushi Ono.
Mantle is yellow to pale orange-brown and there are relatively low angled ridges. The ridges are lined with white and oulined with rows of small brown specks. brown and white marks can be found scattered elsewhere on the mantle. The rhinophore clubs are black and there is a dull black mark on the posterior side of the rhinophore stalks. The gills are translucent white.
•Fahey, S. & Gosliner, T.M. (1999) Description of three new species of Halgerda from the western Indian Ocean, with a redescription of Halgerda formosa, Bergh, 1880. Proceedings of the California Academy of Sciences, 51(8): 365-383.
Rudman, W.B., 2000 (March 14) Halgerda dalanghita Fahey & Gosliner, 1999. [In] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/halgdala
August 19, 2008
From: Colin Ogden
Concerning message #21783:
I was browsing on the forum this morning, and came across the message from Barbara Hanchard on the Halgerda dalanghita. Jesse Veldhuis took this picture in August 2006 of this slug in the rockpools here at Sodwana Bay, which shows that the distribution is much wider. It must be extremely rare here, because this is the only record I have of it being seen.
Locality: Sodwana Bay, South Africa, Indian, Aug 2006, rock pool. Length: 20 mm. Photographer: Jesse Veldhuis.
firstname.lastname@example.orgOgden C. M., 2008 (Aug 19) Halgerda dalanghita from Sodwana Bay. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/21804
Thanks for the record. I made a mistake in my reply to Barbara's message when I said Halgerda dalanghita was only known from the Japanese region. The only reports on the Forum were from Japan but it was originally reported from South Africa, Papua New Guinea and the Philippines, so as I say in the Fact Sheet, it apparently has a wide Indo-West Pacific distribution.
August 13, 2008
From: Barbara Hanchard
I noticed there are very few entries for Halgerda dalanghita and perhaps this entry will add to the numbers and information on the Forum. I was delighted to find this nudibranch the other day. Please can you confirm whether or not it is likely to be Halgerda dalanghita.
Locality: Leilei, Honiara, 10 meters, Guadacanal, Solomon Islands, Pacific Ocean, 10 August 2008, Sandy slope. Length: 20 mm. Photographer: N.Barbara Hanchard.
email@example.comHanchard, N.B., 2008 (Aug 13) Halgerda dalanghita from the Solomon Islands. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/21783
Note added 19 August 2008: This species has a wide Indo-West Pacific distribution - not just the Japanese region. [see message #21804]
From the colour pattern and nature of the ridging on the mantle I have no doubt that your identification is correct. Until now, this species has only been reported from the Japanese region, so your find is a substantial increase in the species' known distribution.
March 11, 2002
From: Nishina Masayoshi
I think Halgerda dalanghita on your site and this animal are similar. They were feeding on the yellow sponge I have photographd them on.
I hope you can recognize that there are two animals in the lower left image.
Date: 3 March, 2002
Location: Hachijo Island Japan
Masayoshi, N., 2002 (Mar 11) Halgerda dalanghita? from Japan. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/6378
Thnaks for these photos which give us a bit more information on the species. I have included an enlargement (lower right) of the second animal in your photo so we can see it more clearly.
January 10, 2002
From: Rie Nakano
This Halgerda dalanghita was found by Mr.H Kojima in Hachijo Is, Japan, in December,2001.
This species is very rare in Hachijo Is.
On the rocky reef.
firstname.lastname@example.orgNakano, R., 2002 (Jan 10) Halgerda dalanghita from Japan. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/5901
Thanks for this interesting find. This specimen has a much bolder colour pattern than those in Atsushi Ono's earlier photo from Kerama Island.
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