Re: Janolus fuscus from Puget Sound

September 30, 2005
From: Jack Connick


Concerning the comments [#14196] on my message.  Sorry, but there is no way this was a Hermissenda crassicornis, they are quite totally different. Although Hermissenda are supposed to be in these waters, I've never observed them or seen photos taken within Puget Sound, maybe out on the coast.

I was wrong about the jellyfish, it is a "scrambled egg" jelly. maybe it was eating something on the jelly? There werre two of them seemingly doing the same activity.

I'm attaching another Janolus fuscus shot [upper ] at Little Patos Island in the San Juans near the southern Strait of Georgia. Also attached is a Hermissenda shot [lower ] at San Miguel Island, California, they are quite common in August.

Locality: [for Janolus fuscus]  Little Patos Island, San Juan Islands, Boundary Pass, Washington, USA. Depth: 20 feet. Length: 2". 8 August 2005. shallow ground kelp. Photographer: Jack Connick

Jack

JackConnick@Yahoo.com

Connick, Jack, 2005 (Sep 30) Re: Janolus fuscus from Puget Sound. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/14856

Dear Jack,
Thanks for the beautiful photos for the 'identity parade'. I'm afraid that without the animal, or a photo of its head, there is no easy solution to this puzzle. Your photo [#14142 ], certainly looked to me like Janolus fuscus, but I have no experience of the fauna of your coastline. However Jeff Goddard, who does know the fauna well, explained why he believed it to be Hermissenda crassicornis [message #14196 ]. All I can say is that your animals had a distinct white line down each ceras from the tip, and a white line around the edge of the foot. I don't know of any Janolus fuscus with such white lines, yet we have two messages on the Forum [#11055, #11719 ] with photos of animals from quite close to Puget Sound [British Columbia] with such lines, and they are definitely Hermissenda crassicornis. Certainly Californian specimens of Hermissenda, as in your photo, look quite different from J. fuscus, but northern ones look quite quite similar

If anyone else can contribute, please do.
Best wishes,
Bill Rudman

Rudman, W.B., 2005 (Sep 30). Comment on Re: Janolus fuscus from Puget Sound by Jack Connick. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/14856

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Hermissenda crassicornis

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