Re: Elysia tomentosa from Heron Id (2)

December 10, 2001
From: Kathe R. Jensen

Dear Bill & Julie,
The specimens from Heron Island look very similar to my specimens from the Abrolhos Islands - especially the shape of the papillae along the parapodial margins. It is difficult to discern any coloured lines along the parapodial margins, but this could be due to reflected light. The general body colour of the larger specimen is almost identical to my specimens of E. tomentosa. I am a little disturbed about finding the animals on Halimeda. My animals were all on Caulerpa.

It is not possible to see the renopericardial ridge on these photos, but in E. tomentosa there is a long renopericardial ridge with 6-7 pairs of branching vessels. None of my specimens had a white pericardium - in fact the parapodia completely covered the pericardium in the living animals.

I would like to see more specimens from the Indian Ocean and maybe Indonesia and the Philippines, indicating a continuous distribution of one species - or if all West Pacific specimens have the white pericardium and Indian Ocean specimens do not, then there might be 2 species. So I think the "safe" solution is to keep the specimens with a white pericardium as "cf. tomentosa".
Cheers,
Kathe

jensen@ait.ac.th

Jensen, K.R., 2001 (Dec 10) Re: Elysia tomentosa from Heron Id (2). [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/5789

Thanks Kathe,
Bill Rudman

Factsheet

Elysia cf. tomentosa

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