Phyllodesmium poindimiei (Risbec, 1928) 33mm
OPISTHOBRANCH OF THE WEEK
Opisthobranch of the Week Data
Frequency on Okinawa:
- Order: NUDIBRANCHIA
- Suborder: Aeolidacea
- Family: Facelinidae
[brackets indicate range for all Okinawa-collected specimens of the species]
- Individual Collection No: RFB #3861-A
- Location: Tengan Pier, Okinawa (26° 24.0'N, 127° 51.1'E)
- Date: 20 April, 2001 [Apr '92, Jun, '95(2 indiv, May '96(3 indiv), Apr '01]
- Depth: 30ft (9m) [30ft, 40ft (6 indiv)]
- Water temperature at collection depth: 72°F (22°C)
- Size: TL 33mm [15mm, 20mm, 20mm, 27mm, 28mm, 33mm, 35mm]
- Specimen deposited: RFB Personal Research Collection (different individuals of the species deposited at Cal Acad Sci)
Phyllodesmium poindimiei is considered to be rare on Okinawa as I have seen and collected a total of seven individuals, since collecting the initial specimen in April of 1992. All collected specimens came from the same collection site, Tengan Pier, from near the base of heavily encrusted concrete pilings supporting the pier.
Rudman (1991) points out the general similarity in external shape between that of P. poindimiei and P. serratum, and he suggests the two animals can be separated by a number of external characters, several of these characters are as follows:
The cerata of P. poindimiei are longer and less numerous and the post-cardiac cerata are arranged in a series of single vertical rows rather than the arches found in P. serratum . . . and the absence of a median white dorsal line in P. poindimiei.
Here's a photo link to the orange telestacean soft-coral (Carijoa sp.) which P. poindimiei is thought to feed upon (Rudman, 1991, 2000).
As of this date (mid-July, 2001) there are twelve described Phyllodesmium species found here in the waters of Okinawa. The twelve species are:
- Rudman, W.B. 1991. Further studies on the taxonomy and biology of the octocoral-feeding genus Phyllodesmium Ehrenberg, 1831 (Nudibranchia: Aeolidoidea). Journal of Molluscan Studies, 57(2): 167-203.
- Rudman, W.B., 2000 (June 18). Comment on Phyllodesmium poindimiei? from Sydney by P. Zylstra & H. Rothenfluh. [Message In] Sea Slug Forum. http://www.seaslugforum.net/find.cfm?id=2584.
Page Date: 23 Jul '01
Page Modification Date: 01 May '15
Digitally manipulated photo
Copyright © 2015 Robert F. Bolland