Costasiella from Indonesia

March 15, 2003
From: Takako Uno


Dear Dr. Rudman,
This sea slug is also from Lembeh, Sulawesi, Indonesia on Dec 2002 trip. It was on some kind of seagrass at 10 meters. The little nudi was less than 5mm in length. Photo: Takako Uno

Can you tell me which kind is it? Is it Stiliger or Costasiella?

Warmest thanks,
Takako

divetoto@hotmail.com

Uno, T., 2003 (Mar 15) Costasiella from Indonesia. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/9199

Dear Takako,
The best way to separate Costasiella from other sacoglossans with cerata is to look at their eyes, which in Costasiella are very close together. However I can't see them in your photo. However from the general shape of the body I am pretty sure your animal is a species of Costasiella. I have checked the known species of the genus and cannot find a description that fits your species. One problem is that many of the species have been described from one or very few specimens, so without any knowledge of the colour variation in each species it is impossible to know whether your photo represents a new species or a colour variation of a named species. At present I will call it Costasiella sp. 3.
Best wishes,
Bill Rudman

Rudman, W.B., 2003 (Mar 15). Comment on Costasiella from Indonesia by Takako Uno. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/9199

Factsheet

Costasiella sp. 3

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