Re: Elysia tomentosa from Ratnagiri, India

May 13, 2009
From: Cynthia D. Trowbridge

Concerning message #22438:

Hi Bill,

Actually, Vishal's algal identification is correct. He said that the eggs were on Caulerpa scalpelliformis (bottom right photo). For whole-thallus photos, please look here:http://algaebase.org/search/species/detail/?species_id=1411&sk=0&from=results

The other alga (where the slugs are) could be Caulerpa taxifolia or C. sertularioides (see http://algaebase.org/search/species/detail/?species_id=1412&sk=0&from=results). The two are often confused as they are morphologically similar.

Cordially,
Cynthia

sacoglossans@ymail.com

Trowbridge, C.D., 2009 (May 13) Re: Elysia tomentosa from Ratnagiri, India. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/22457

Thanks Cynthia,

What I was trying to say was that without expert advice, some of these species of Caulerpa are very difficult to identify. What interested me was how this Elysia is often found associated with species of Caulerpa which all have a very similar feather-like shape. Your suggestion that Vishal's animals are associated with two different species of very similar shape illustrates this very well. Of course, as we can see on the Forum, E. tomentosa also appears to be associated with other species of Caulerpa, so maybe the reason it is often found on 'feather-shaped' species of Caulerpa is because such species of Caulerpa often occur in large obvious patches.

Best wishes,
Bill Rudman

Rudman, W.B., 2009 (May 13). Comment on Re: Elysia tomentosa from Ratnagiri, India by Cynthia D. Trowbridge. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/22457

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