Re: Acanthodoris hudsoni or Cadlina?

February 22, 2008
From: Leslie Harris

Concerning message #21109:

Hi Dave, Paul, and Bill --

The hitchhiker is a juvenile Arctonoe vittata. Since Jim Lyle brought nudi-riding worms to my & Bill's attention in 2005 (messages #14298 & #14447)I've seen several more cases so it's probably not uncommon - just unseen because they're small & fairly transparent. Arctonoe vittata, A. pulchra, and A. fragilis (probably the worm in message #14447) are all well known commensals but until Jim first photographed the association they were not reported to be on nudibranchs. There's usually only one adult Arctonoe per host. Small ones would be unable to compete with a adult so it makes sense that they would seek out smaller organisms as hosts.

Cheers,
Leslie

lharris@nhm.org

Harris, L.H., 2008 (Feb 22) Re: Acanthodoris hudsoni or Cadlina?. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/21389

Thanks Leslie,
I am so glad that we have a participant with broader interests than most of us. It is great to be able to get some background information on some of the many organisms that interact with sea slugs. The identity of the nudibranch is still somewhat tentative, and probably impossible to resolve just from photos, but on the basis of feedback from Dave Behrens and Brian Kenney I have moved it to Cadlina luteomarginata.

Best wishes,
Bill Rudman

Rudman, W.B., 2008 (Feb 22). Comment on Re: Acanthodoris hudsoni or Cadlina? by Leslie Harris. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/21389

Factsheet

Cadlina luteomarginata

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