Polycera quadrilineata from Turkey

May 29, 2003
From: Haluk Akbatur

Dear Bill,
Here is another nudi from Uc Adalar, East coast of Turkey. I have read the different messages and replies about the difference between Polycera quadrilineata and ,Polycera aurantiomarginata recently. I have some difficulty in identifying this dorid. Is it a Roboastra luteolineata or Polycera sp.? Specimens were seen on 18 May 2003, Dive site: Uc adalar (South-west of Turkey, Mediterranean coast,] Size: 1.5 cm, Depth:3-5m.

There are some yellow marks along the edge of the foot. Could you confirm it is Polycera quadrilineata please?

Haluk Akbatur

Lasergoz@ttnet.net.tr

Akbatur, H., 2003 (May 29) Polycera quadrilineata from Turkey. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/10053

Dear Haluk,
Firstly, the long papillae or tentacles around the front of the head are a sign that it is most probably a species of Polycera rather than a species of Roboastra. As to which species you have. As you say P. aurantiomarginata always has an orange border to the foot as its name suggests. But if you look at Jean-Pierre Bielecki's message, it seesm a few yellow spots along the edge of the foot are sometimes present in P. quadrilineata.

The two species can also be distinguished in the colour of the rhinophore club - in P. aurantiomarginata at least the upper half, but not the tip is bluish-black, and in P. quadrilineata, yellow or orange. Similarly the apical part of the gills are black in P. aurantiomarginata and yellow in P. quadrilineata. In you animal, both these characters match the colour pattern for P. quadrilineata. See also the discussion concerning Baki's photos from the same locality
Best wishes,
Bill Rudman

Rudman, W.B., 2003 (May 29). Comment on Polycera quadrilineata from Turkey by Haluk Akbatur. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/10053

Factsheet

Polycera quadrilineata

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