Variation in Thuridilla hopei

February 20, 2000
From: Erwin Koehler


Hi Bill,
here are some more colour variants of Thuridilla hopei (Vérany, 1853) from the Mediterranean.

My impression is, that the very dark blue form with no yellow spots, or very few, and dark orange/red lines at the edge of the parapodia live rather deep. For example the upper right specimen in Miquel Pontes message was at 15 m, my EK061905 was taken at 57 m depth in Croatia, Balun Is., July 1996 - length 2,5 cm.

In shallow waters the variant like EK075804 is very common - this one was taken in Italy, Elba Is., Capoliveri, divesite "Yellow Wall" size 2 cm, depth 11m, July 07, 1997. It would be great to hear, if other divers and/or scientists made the same or other observations...

The greenish variant (EK071601) is from Malta, divesite "Blue Grotto", 12 mm, depth 6 m, May 08, 1997 - the only sight of this variant.
Erwin.

Medslugs.Koehler@t-online.de

Koehler, E., 2000 (Feb 20) Variation in Thuridilla hopei. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/1934

Dear Erwin,
Thanks for the observations. It will be interesting to hear what others have to say.
Best wishes,
Bill Rudman.

Factsheet

Thuridilla hopei

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