OKINAWAN
OPISTHOBRANCH OF THE WEEK
Cuthona sibogae Bergh, 1905 (12mm)
Opisthobranch of the Week Data
Taxonomy:
- Order: NUDIBRANCHIA
- Suborder: Aeolidina
- Family: Tergipedidae
Frequency on Okinawa:
Collection Data:
- Individual Collection No: RFB #3724-B
- Location: Tengan Pier (26o24.0'N, 127o51.1'E)
- Date: 17 August, 1999 [1 Aug 87, 8 Mar 91(2 indiv), 11 Mar 91(2 indiv),
19 Feb 93(2 indiv), 25 Dec 96, 17 Aug '99]
- Depth: 30ft (8m) [one from 25ft, one from 30ft, all others from 40ft]
- Water temperature at collection depth: 80oF (27oC)
- Size: TL 16mm [9mm, 10mm, 12mm, 13mm, 14mm, 16mm, 16mm, 16mm, 18mm]
- Specimen deposited: RFB Personal Research Collection (different individuals
of the species deposited at Cal Acad Sci).
[brackets indicate range for all Okinawa-collected specimens of the species]
Species Account:
Cuthona sibogae is considered to be uncommon on Okinawa as I have seen and collected a total of nine individuals since 1 August, 1987. Several additional specimens have been seen, but not collected. All observed, as well as collected specimens, were from Tengan Pier, beneath the pier on the pier supports. In all cases, the animals were collected from relatively delicate, feather-like hydroids.
The normally deep purple notum and orange-tipped cerata make this beautifully pigmented, small tergipedid quite distinctive.
In addition to the above featured animal I've previously featured on these pages the following species of Cuthona:
C. acinosa
C. diversicolor
C. ornata
C. pupillae
C. purpureoanulata
C. yamasui
C. sp. 1
C. sp. 2
C. sp. 3
Page Date: 17 Feb '97
Page Modification Date: 01 Sep '08
Digitally manipulated photo
Copyright © 2008 Robert F. Bolland