Hypselodoris kanga laying eggs in Lembeh

July 28, 2007
From: Mike Krampf

Dear Bill

I thought you might find these pictures interesting. I struggling telling the difference between Hypselodoris infucata and H. kanga but I'm guessing these to be H. kanga.

Locality: Dive Site - Jahir 2 in Lembeh Strait, 40 ft, North Sulawesi, Indonesia, Molucca Sea, 01 July 2007, Sandy bottom. Length: 3 cm. Photographer: Mike Krampf.

Cheers,
Mike

mtkrampf@yahoo.com

Krampf, M., 2007 (Jul 28) Hypselodoris kanga laying eggs in Lembeh. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/20163

Dear Mike,
The easiest external distinguishing character between these two species is the shape and colour of the gills. If you can imagine a cross-section through one of the gills in this photo it would be a triangle, which means that each gill has a flat outer edge, and gill leaflets down each side. Hypselodoris kanga has gills like this. On the other hand, in H. infucata, the gills have only two sides, each lined with leaflets, so in cross-section it would be a single plane. In both species the edges are lines with red or orange, so in H. infucata there is a single red line up the inside and a single red line up the outside edge. In H. kanga, there is a single red line up the inside edge, and a red line up the two outside edges. Usually the space between the  two outside red lines contains a  row of white or yellow spots which makes the difference between the two species very obvious.

As luck would have it, your animals don't show the spots very well but I assume the few white spots we can see are all that are present in these animals. The spots are possibly defensive glands, so they could recently have has their contents expelled.

Best wishes,
Bill Rudman

Rudman, W.B., 2007 (Jul 28). Comment on Hypselodoris kanga laying eggs in Lembeh by Mike Krampf. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/20163

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