Favorinus sp. 1(5mm)
Photo by Atsushi Ono

Opisthobranch of the Week Data


Frequency on Okinawa: Collection Data:
[brackets indicate range for all Okinawa-collected specimens of the species]

Species Account:

        Favorinus sp. 1 is considered to be very rare in Okinawan waters; only two individuals have been seen and collected by Atsushi (pers. comm.) and RFB has seen none directly off Okinawa's main island. The above animal was collected from Aka Island in the Kerama Islands, one of a series of islands in the Kerama Islands Group, which are located 30 ~ 40 kilometers west of the Okinawa Capitol, Naha. This featured animal was found by Atsushi Ono during July of 2006 in 8m of water. The animal was initially found crawling on the egg mass shown above. The egg mass was found on a sandy bottom. The image of the above featured animal was kindly furnished by Atsushi and and is used here with his kind permission. I've added a second page with several remarkable images, also furnished by Atsushi, of this animal penetrating an egg mass (haminoeid?).

        Terry Gosliner has several images of an egg-eating Favorinus from both the Philippines and Papua New Guinea posted on the Sea Slug Forum. On the Fact Sheet of the same Sea Slug Forum URL there are links to images and discussions of additional egg-laying aeolids.

        I've previously featured two described species of Favorinus from the waters of Okinawa's main island, as follows:

  • F. japonicus
  • F. mirabilis
  • Literature Cited:

    Page Date: 19 May '08
    Page Modification Date: 19 May '08
    Digitally manipulated photo
    Copyright © 2008 Robert F. Bolland