Runcina adriatica from France

September 16, 2005
From: Marina Poddubetskaia Ossokine

Dear Bill,

Here are some more photos of Runcina adriatica for the Forum. I found this tiny cephalaspidean in French Mediterranean and Lucas Cervera identified it for me.

Locality: 'La digue', Port-Leucate , France. Mediterranean. Depth: 2 m. Length: 3 mm. 12 September 2005. Photographer: Marina Poddubetskaia Ossokine

To be perfectly frank, I know nothing about this species. So, if you could provide me and other participants with some additional information about it, it would be great.

All the best,
Nembro website

Poddubetskaia Ossokine, M., 2005 (Sep 16) Runcina adriatica from France. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from

Dear Marina,
We don't know much about the biology of most of the runcinids or their relatives. They are all herbivores, feeding on filamentous green algae. They look quite like aglajids, but they don't have a separate head shield. Internally they have a large grinding gizzard, as do the haminoeids, but they differ in having 4 plates not three. They are all very small, seldom reaching more than 5 mm, and are often quite abundant. Some species have a small internal shell which is reduced to a thin calcified plate. Apart from the few papers I have listed on the Fact Sheet, I don't think much has been published on Runcina adriatica.

  • Rudman,WB (1971): Structure and functioning of the gut in the Bullomorpha (Opisthobranchia) Part 1. Herbivores. Journal of Natural History 5(6): 647-675, 18 figs.

Best wishes,
Bill Rudman

Rudman, W.B., 2005 (Sep 16). Comment on Runcina adriatica from France by Marina Poddubetskaia Ossokine. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from


Runcina adriatica

Related messages

  1. Runcina adriatica from the Azores
    From: Terry Gosliner, December 16, 2008

Show factsheet and all related messages