Hypselodoris infucata & H. kanga

July 4, 2005
From: Bob Whorton

Hi Bill,

Came across this pretty Hypselodoris in Lembeh last year. First time I'd seen the blue variety. Plenty of the green version tho'

Locality: Jahir dive site, Sulawesi, Lembeh Strait, Indonesia. Depth: 12 m. Length: 6 cm. September 2004. Black Sand. Photographer: Bob Whorton

Bob

drbob.whorton@btinternet.com

Whorton, R., 2005 (Jul 4) Hypselodoris infucata & H. kanga. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/14188

Dear Bob,
The bright blue animal is a colour form of Hypselodoris infucata. Have a look at Sabine Noack's message [#9508] for the same colour form from Bali. The reason I am considering it a colour form of H. kanga are the triangular patterns at the edge of the mantle. If you look at other photos on the Forum of more typical colour forms of H. infucata [see message #9133] you will see darker green or blue diamond shaped marks at the edge of the mantle. I think the triangular marks in your animal are the outer half of the diamond pattern.

The green animal you mention [lower left photo] is a different species, Hypselodoris kanga, which can be distinguished by the shape and colour of the gills. I have discussed this in more detail in a separate message [#14186]. It is possible that H. infucata has evolved this blue colour form to mimic H. kanga much as occurs in the red-spotted chromodorids of southeastern Australia, but we would need a lot more information to demonstrate that.

Best wishes,
Bill Rudman

Rudman, W.B., 2005 (Jul 4). Comment on Hypselodoris infucata & H. kanga by Bob Whorton. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/14188

Factsheet

Hypselodoris infucata

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