Hypselodoris kanga from Bali

December 13, 2005
From: Erwin Kodiat

Hi Bill,
Actually I'm not so sure if it is H. obscura or H. infucata. Can you help me ID this?

Locality: Seraya, Bali, Indonesia. Lombok Strait. Depth: 12 meters. Length: 50 mm. 20 November 2005. Rocky. Photographer: Erwin Kodiat

Thanks,
Erwin Kodiat

ungu@terong.com

Kodiat, E., 2005 (Dec 13) Hypselodoris kanga from Bali. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/15444

Dear Erwin,
I am afraid it is neither of those species. It does belong to this group of similarly colored species, but H. obscura is only found in south- eastern Australia, which counts it out, and the wide-spread H. infucata has simple gills

This is an 'all spotted' form of Hypselodoris kanga [see message #8722]. I have discussed the difference between it and H. infucata in an earlier message [#14188]. Sometimes H. kanga can have dark blue diagonal lines on the mantle while at other times it can have dark blue spots. Its most distinguishing feature is the shape and colour of the gills, which are triangular in cross-section, and have a series of yellow (or cream) spots on the smooth outside face of each gill. The three edges of each gill are lined with blue (basally) and red (apically) although in different animals one or the other of these colours can dominate.

In your photo, the swollen oral tube can be seen protruding from the mouth, a sure sign that it is feeding. Unfortunately I can't see any sign of its sponge food, but I guess it has found a small colony of Dysidea,  the only sponge it is known to eat.

Best wishes,
Bill Rudman

Rudman, W.B., 2005 (Dec 13). Comment on Hypselodoris kanga from Bali by Erwin Kodiat. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/15444

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