Rostanga pulchra from British Columbia

November 5, 2005
From: Marli Wakeling

Hi Bill,
I'm glad Jeff verified the ID of the Aldisa sanguinea [message #15173]; I did think at first it was Rostanga pulchra, as they are common in the area. They are usually quite a bit smaller however in this locale, and the egg ribbon is thinner. So, here's a Rostanga pulchra from the same area. Although I have seen them in deep red, in Campbell River, they are almost always bright orange.

Locality: Steep Island, Campbell River. British Columbia, Canada. Pacific coast. Depth: 45 feet. Length: 15 mm. 08 October 2005. Rocky Wall. Photographer: Marli Wakeling

Cheers,
Marli

scubamarli@gmail.com

Wakeling, M., 2005 (Nov 5) Rostanga pulchra from British Columbia. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/15178

Dear Marli,
I threw Rostanga pulchra into the discussion about your last animal [message #15161] even though the mantle didn't look quite right, because I thought that both the Aldisa species on the Nth American west coast have dark spots in the midline. I am glad we have had such a quick reponse.

However, I suspect this is not Rostanga pulchra either. The spaced tubercles are like the mantle of your A. sanguinea, and the yellow orange colour and row of small brown spots down the midline, make me think this is Aldisa cooperi. It would be nice to have a photo of the egg ribbon for comparison. Unfortunately the only photos of Rostanga pulchra I have on the Forum don't show the texture of the mantle very well, but if you look at other Rostanga species on the Forum you will see they have a very 'furry' appearance from the bristle-like caryophyllidia which cover their backs.

Brian Penney's message today [#15177] also supports this view, as he never found Rostanga deeper than 5 meters. Obviously I would appreciate some confirmation of my identification
Best wishes,
Bill Rudman

Rudman, W.B., 2005 (Nov 5). Comment on Rostanga pulchra from British Columbia by Marli Wakeling. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/15178

Factsheet

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