Thordisa villosa (Alder & Hancock, 1864) 25mm
OPISTHOBRANCH OF THE WEEK
Photo by Atsushi Ono
Opisthobranch of the Week Data
Frequency on Okinawa:
- Order: NUDIBRANCHIA
- Suborder: Doridina
- Family: Discodorididae
- Very rare, only a single collected specimen, but Atsushi reports seeing several individuals in the Keramas
[brackets indicate range for all Okinawa-collected specimens of the species]
- Individual Collection No: Atsushi Ono #0-612
- Location: Agenasiku Island, Kerama Islands, Okinawa
- Date: May, 1998 [only a single collected specimen]
- Depth: 16ft (5m)
- Water temperature at collection depth: ca. 75oF (ca. 24oC)
- Size: TL 25mm [only a single collected specimen]
- Specimen deposited: Atsushi Ono Personal Research Collection
I've not personally seen Thordisa villosa here in the waters of Okinawa's main island. Atsushi Ono mentions collecting only a single specimen (pers. comm.) but has seen several individuals in the Keramas* and considers this animal to be very rare there. Atsushi reports finding the above featured animal on the under side of dead coral. For additional information concerning this dorid, Bill Rudman has a
series of messages and images of T. villosa posted on the Sea Slug Forum.
In addition to the above featured animal, I've previously presented on these pages the following members of the genus from Okinawan waters:
- Villosa comes from the Latin stem vill meaning hairy, shaggy, rough.
- Rudman, W.B., 1999 (January 13). Thordisa villosa (Alder & Hancock, 1864). [In] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/factsheet.cfm?base=thorvill.
* Keramas = the Kerama Islands Group, located 30 ~ 40 kilometers west of the Okinawa capitol, Naha.
Page Date: 27 Dec '04
Page Modification Date: 04 Feb '13
Digitally manipulated photo (image has been horizontally flipped)
Copyright © 2013 Robert F. Bolland