Colour variation in Halgerda batangas

October 1, 2008
From: Marcel Tanke

Concerning message #21570:

Dear Bill,

Both pictures attached show, I think, Halgerda batangas. The one in the first picture (Anilao, Philippines, July 2008) shows a fine mazed network of red lines on its mantle. The second one (Lembeh Strait, Indonesia, February 2007) has more parallel red lines.

Best regards,
Marcel

marceltanke@cs.com

Tanke, M.A., 2008 (Oct 1) Colour variation in Halgerda batangas. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/21917

Dear Marcel,

I agree that these are most probably forms of H. batangas. See my comments in message #19119 which has similar variations. Although we don't have actual specimens to compare, photos like yours give us valuable information on the range of colour pattern to be found. Although the extremes of the colour pattern, as illustrated in your two animals, might suggest two species, the intermediates we now have on the Forum, suggest otherwise. In fact the photo in your message #21916  shows lines on the rather elongate tubercles and a network in the spaces.

Best wishes,
Bill Rudman

Rudman, W.B., 2008 (Oct 1). Comment on Colour variation in Halgerda batangas by Marcel Tanke. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/21917

Factsheet

Halgerda batangas

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