Umbraculum mediterraneum from Croatia

May 16, 2006
From: Andrej Jaklin

Dear Bill,
In the comment on how to (possibly) distinguish two species of Umbraculum (message #8411 ) you mentioned "whitish radial marks on the edge of the tubercles".
I think attached picture shows/confirms that very nicely.

Locality: Korcula Island, unknown, Croatia, Middle Adriatic Sea, 28 April 2004, night dive. Length: unknown. Photographer: Miljenko Marukic.

Best regards,
aj

jaklin@cim.irb.hr

Jaklin, A., 2006 (May 16) Umbraculum mediterraneum from Croatia. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/16603

Dear Andrej,

It definitely does, but since then it has become clear that  Indo-West Pacific animals [see message 12844] can also have this radiating pattern. I think it is caused by grooves around the tubercles which get deeper and shallower depending on the 'inflation'  of the tubercles. I also suspect the whitish coloration to be glandular secretions - possibly defensive.

Best wishes,
Bill Rudman

Rudman, W.B., 2006 (May 16). Comment on Umbraculum mediterraneum from Croatia by Andrej Jaklin. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/16603

Factsheet

Umbraculum mediterraneum

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