Hallaxa indecora (Bergh, 1905) 8mm
OPISTHOBRANCH OF THE WEEK
Opisthobranch of the Week Data
Frequency on Okinawa:
- Order: NUDIBRANCHIA
- Suborder: Doridina
- Family: Actinocyclidae
[brackets indicate range for all Okinawa-collected specimens of the species]
- Individual Collection No: RFB #3068
- Location: Seragaki, Okinawa (26o 30.4'N, 127o 52.6'E)
- Date: 20 September, 1992 [30 May '91, 23 Jul '91, 28 Nov '91, 21 Jun '92, 20 Sep '92,
15 Mar '93]
- Depth: 3ft (1m) [3ft, 10ft, 10ft, 10ft, 10ft, 15ft]
- Water temperature at collection depth: Not recorded
- Size: TL 8mm [6mm, 6mm, 7mm, 7mm, 7mm, 8mm]
- Specimen deposited: California Academy of Sciences
Hallaxa indecora is considered to be rare on Okinawa as I've
seen and collected a total of six individuals; the initial specimen was collected on the 30th of May, 1991. The above featured animal was found crawling on the surface on a reef flat of a mostly dead stony coral reef.
This small cryptic species is reported from Indonesia, the Gulf of Aden, the Gulf of Suez, New Caledonia, Japan (Baba, 1949), and more recently, from Okinawa (Gosliner & Johnson, 1994). In life, the animal has a light plum-colored appearance, and a smooth notum as well as having the rhinophores and gills exhibiting a uniform purplish-brown color.
- Baba, K. 1949. Opisthobranchia of Sagami Bay collected by His Majesty The Emperor of Japan. Iwanami Shoten: Tokyo. 194 pp., 50 pls.
- Gosliner, T. & S. Johnson. Review of the Genus Hallaxa (Nudibranchia:
Actinocyclidae) with Descriptions of Nine New Species. Veliger 37(2): 155-191.
Page Date: 24 Apr '00
Page Modification Date: 24 Apr '00
Digitally manipulated photo
Copyright © 2000 Robert F. Bolland