OKINAWAN
OPISTHOBRANCH OF THE WEEK
Placida cremoniana (Trinchese, 1893) 6mm
Photo by Atsushi Ono
Opisthobranch of the Week Data
Taxonomy:
- Order: SACOGLOSSA
- Family: Stiligeridae
Frequency on Okinawa:
- Uncommon in the Keramas, rare in the waters of Okinawa's main island
Collection Data:
- Individual Collection No: Photo only, specimen not collected
- Zamami Island, Kerama Islands, Okinawa [Horseshoe Cliffs & Seragaki (Okinawa's main island)]
- Date: January, 1999 [24 May '91, 1 Jun '92, 23 Jan '93]
- Depth: 16ft (5m) [5ft, 10ft, 10ft]
- Water temperature at collection depth: ca. 70°F (ca. 21°C)
- Size: TL 6mm [4mm, 5mm, 8mm]
- Specimen deposited: Photo only, without specimen (different individuals of the
species deposited at Cal Acad Sci)
[brackets indicate range for all Okinawa-collected specimens of the species]
Species Account:
Placida cremoniana is considered to be rare in the waters of Okinawa's main island. RFB has collected three animals from Okinawa and Yukinobu Adachi has
an image of P. cremoniana, also from Okinawa's main island, on his Marine Photography Page.
Atsushi Ono reports (per. com.) seeing in excess of ten individuals in the Keramas.
The above featured animal was found and photographed on the rope of a buoy by Atsushi in January of 1999 from Zamami Island, Kerama Islands Group, located 30 ~ 40 kilometers west of the Okinawa capitol, Naha. Atsushi has kindly furnished the above image of this 6mm animal and is used here with his permission.
Literature Cited:
Page Date: 17 Jun '02
Page Modification Date: 17 Jun '02
Digitally manipulated photo
Copyright © 2002 Robert F. Bolland
