Re: Favorinus mirabilis from Red Sea

March 17, 2008
From: Binyamin Koretz

Concerning message #13273:

Dear Bill,

In the years since Oren first photographed what you called Favorinus sp. 7, it's become a common visitor in the late winter to early spring when the Eilat coastline gets inundated with filamentous algae. They are generally in the 6 to 8 mm range.

This year we upgraded our photographic ability with a macro lens (actually 2) and we were able to document the species a lot more clearly. The accompanying photographs were taken with the animal crawling on my glove, as it was not possible to get satisfactory results in the algae.

Having seen the details, I was wondering whether this species would fall within the variability of Favorinus mirabilis. What do you think?

best regards

Locality: Eilat, Tables South, 18 m, Israel, Red Sea (Gulf of Eilat), 22 February 2008, sandy slope, some corals, all covered with filmentous algae. Length: 6 mm. Photographer: Binyamin and Shulamit Koretz.

Koretz, B., 2008 (Mar 17) Re: Favorinus mirabilis from Red Sea. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from

Dear Binyamin,

Yes from these nice photos I think it is pretty clear that this is F. mirabilis. So we no longer need Favorinus sp. 7. It is interesting to note the yellow mark on each side of the head - something we don't normally see in photos taken from above.

Best wishes,
Bill Rudman

Rudman, W.B., 2008 (Mar 17). Comment on Re: Favorinus mirabilis from Red Sea by Binyamin Koretz. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from

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