Costasiella cf. kuroshimae
Negros Oriental Island, Lipayo, divesite "Dauin". Philippines, 3mm long, Depth: 7m. 8 March 2002. Photo: Erwin Koehler
Initially I considered that this might be Costasiella kuroshimae but Atsushi Ono has sent photos which match Ichikawa's description much more accurately.
• Ichikawa, M. (1993) Saccoglossa (Opisthobranchia) from the Ryukyu Islands. Publications of the Seto Marine Biological Laboratory, 36: 119-139.
Rudman, W.B., 2002 (May 12) Costasiella cf. kuroshimae [In] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/factsheet/costcfkuro