Halgerda albocristata Gosliner & Fahey, 1998 (10mm)
OPISTHOBRANCH OF THE WEEK
Opisthobranch of the Week Data
Frequency on Okinawa:
- Order: NUDIBRANCHIA
- Suborder: Doridina
- Family: Discodorididae
[brackets indicate range for all Okinawa-collected specimens of the species]
- Individual Collection No: RFB #2656-C
- Location: Horseshoe Cliffs, Okinawa (26o30.0'N, 127o50.9'E) [H/S Cliffs, Seragaki]
- Date: 1 August, 1991 [16 Aug '89, 1 Aug '91, 14 Aug '91, 22 May '92, 29 Jun '94, 17 Apr '98]
- Depth: 10ft (3m) [10ft, 10ft, 10ft, 10ft, 15ft]
- Water temperature at collection depth: Not recorded
- Size: TL 10mm [8mm, 9mm, 10mm, 10mm, 14mm, 15mm]
- Specimen deposited: California Academy of Sciences
Halgerda albocristata is a recently described discodorid (Gosliner & Fahey, 1998) reported from both Guam and the Marshall Islands, as well as Indonesia, Okinawa, and the Philippines. The trivial name, albocristata has reference to the obvious white-capped crests on the upper dorsum. The only other Halgerda on Okinawa resembling H. albocristata is H. elegans, although the white ridges of H. albocristata and the orange-yellow crests of H. elegans readily separate the two species.
I've collected six individuals from Okinawa and all six were collected between approximately three and four and a half meters of water. The featured animal was found crawling in the open in association with a live stony coral reef during a daytime SCUBA excursion.
- Gosliner, T.M. & S.J, Fahey. 1998. Description of a new species of Halgerda from the Indo-Pacific with a redescription of Halgerda elegans Bergh, 1905. Proceedings of the California Academy of Sciences 50(15): 347-359, 9 figs.
Page Date: 18 January '99
Page Modification Date: 15 May '00
Digitally manipulated photo
Copyright © 2000 Robert F. Bolland