Re: Acanthodoris hudsoni or Cadlina?

February 22, 2008
From: Brian K. Penney

Concerning message #21109:

Paul and Dave-

I would guess Cadlina luteomarginata: in the lower photo, many of the yellow dots look like they are under the skin, indicating they are chemical defense glands, or Mantle Dermal Formations (MDFs).

In my years in British Columbia (1997-2002), I found scaleworms in the mantle margins of the larger dorids with some frequency (I count almost thirty cases in my notes), including Cadlina luteomarginata. A labmate was an expert on polychaetes, and identified one scaleworm as an Arctonoe species, though I don't recall if it was A. vittata, A. fragilis, or other. A. vittata is a commensal on keyhole limpets and gumboot chitons, so it would make sense if it extended its reach to nudibranchs.

Locality: Barkley Sound, 0-15 m, British Columbia, Canada, Pacific Ocean, rocky, cobble

Best
Brian

bpenney@anselm.edu

Penney, B.K., 2008 (Feb 22) Re: Acanthodoris hudsoni or Cadlina?. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/21390

Thanks Brian,

From your comments and Leslie's [#21389], I think we have identified the worm but it looks like the nudibranch is the problem. From your comments and Dave's I think we should move it to Cadlina luteomarginata.

Best wishes,
Bill Rudman

Rudman, W.B., 2008 (Feb 22). Comment on Re: Acanthodoris hudsoni or Cadlina? by Brian K. Penney. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/21390

Factsheet

Cadlina luteomarginata

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