Two colour forms of Lomanotus genei

July 20, 2006
From: Wilfried Bay-Nouailhat


Dear Bill,

Thanks for your information about Cadlina laevis [message #16923 ]
Here is a photo of the two colour varieties of the nudibranch Lomanotus genei on the same hydroïd, Nemertesia ramosa

Locality: Pen Marmouset, Iles Glénan, Finistère sud, 18 metres, France, Atlantic Ocean, 14 may 2006, On hydroid. Length: 70 mm. Photographer: Wilfried Bay-Nouailhat.

Best wishes
Anne and Wilfried Bay-Nouailhat

contact@mer-littoral.org

Bay-Nouailhat, W., 2006 (Jul 20) Two colour forms of Lomanotus genei. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/17144

Thanks Willy,
When I saw your photo the thing that struck me, other than the two colour forms, was how large the animals were in relation to the hydroid polyps they eat. It didn't seem probable that they would delicately nip of one polyp at a time. Then I noticed the photos on the Fact Sheet which show Lomanotus on long bare knobbed stalks. I had wondered what they were and now realise they are stalks of Nemertesia with all the polyp-bearing side branches missing. Lomanotus apparently strips off all the side branches and eats them polyps and all. I assume the knobs on the central stalk of the Nemertesia are the gonotheca, specialised polyps which are for breeding not feeding. Very interesting

Best wishes,
Bill Rudman

Rudman, W.B., 2006 (Jul 20). Comment on Two colour forms of Lomanotus genei by Wilfried Bay-Nouailhat. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/17144

Factsheet

Lomanotus genei

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