Chromodoris geometrica - copepod parasites
June 11, 2008
From: Teresa Zuberbühler
Concerning message #21340:
Dear Bill
The enclosed picture shows copepods in the gills of Chromodoris geometrica. This seems to be their favorite place to attach, since I have seen it several times, specially on Chromodoris geometrica.
Locality: Lembeh, 15-20m, Sulawesi, Indonesia, Pacific, July 05, sand and rubble. Length: 4-5cm. Photographer: Teresa (Zubi) Zuberbühler.
Greetings from Switzerland
Zubi
webmaster@starfish.ch
Zuberbühler, T., 2008 (Jun 11) Chromodoris geometrica - copepod parasites. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/21605Dear Teresa or Zubi,
As you can see in the top photo on the symbiosis page, commensal and parasitic copepods associated with nudibranchs have a pair of large egg sacs attached to their rear end. The orange sacs in your photo are these egg sacs. In the case of C. geometrica - and many other nudibranchs - the copepods, don't just crawl around on the outside of the animal as in the symbiosis photo, but bury deep into the animal and feed off it. In dorids they are often found in the gill pocket like this.
Best wishes,
Bill Rudman
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