Re: Siraius immonda from sthn Queensland [2]
May 26, 2007
From: Bruce Wilkie
Concerning message #19930:
Hi Bill,
Here is another Siraius immonda for the Forum.
I found this one on the same day that Gary's original message was posted.
Locality: Flat rock, Point lookout, Nth Stradbroke island, 9 metres, Queensland, Australia. , Pacific ocean., 21 May 2007, Rocky reef, hard and soft corals, sponger. Length: 25 mm. Photographer: Bruce Wilkie.
Many thanks,
Bruce Wilkie.
brucedwilkie@yahoo.com
Wilkie, B, 2007 (May 26) Re: Siraius immonda from sthn Queensland [2]. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/19953
Dear Bruce,
I haven't seen such a red specimen before. As soon as I saw your photo it reminded me of Halgerda rubicunda Baba 1949, which has long puzzled me as it does not appear to be a species of Halgerda. In Baba's original description he published two paintings, one with Halgerda-like ridges and the other with tubercles [see image alongside Pl. 25, figs 94-5]. He describes the mantle as having 'finely reticulate ridges with distinct knobs at the points'.
Although there are appear to be some differences in the denticulation of the outer radular teeth, I wouldn't be at all surprised if Halgerda rubicunda turns out to be another synonym of Siraius immonda.
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Baba, K (1949) Opisthobranchia of Sagami Bay collected by His Majesty The Emperor of Japan. Iwanami Shoyen, Tokyo. 194pp
Best wishes,
Bill Rudman
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