Re: Dendronotus dalli from NW Pacific [2]

October 6, 2005
From: Jack Connick

Bill;
Good call on the third photo [message #14898]. I had it as Dendronotus dalli only because of the white tips, but it does appear different. According to Behren's Pacific Coast Nudibranchs, pg 75, the processes and cerata of Dendronotus albus are tipped with orange to red to brown. Perhaps it's Dendronotus diversicolor, but it appears different than those I saw in the area and sent photos of. Behren's photos also shows that the cerata of D.diversicolor' are tipped in yellow. But doesn't specify it in the written description.

Here's another shot.

Locality: Sucia Island, San Juan Islands,  Boundary Pass, Washington, USA. NE Pacific. Depth: 70' Length: 3-4". 11 September 2005. Rocky slope with hydroids. Photographer: Jack Connick

Jack Connick

JackConnick@Yahoo.com

Connick, Jack, 2005 (Oct 6) Re: Dendronotus dalli from NW Pacific [2]. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/14922

Dear Jack,
Both the species I mentioned as possibile identifications have all white colour forms. Have a look at some of the messages on the Forum. One way to separate them is that Dendronotus albus has more than four pairs of cerata (usually 5-7), while D. diversicolor   usually has no more than 4 pairs. Why I couldn't be sure of an identification from your earlier photo was I couldn't see the whole animal and count the cerata. In this photo I can see only 4 pairs of cerata so I assume it is D. diversicolor.
Best wishes,
Bill Rudman

Rudman, W.B., 2005 (Oct 6). Comment on Re: Dendronotus dalli from NW Pacific [2] by Jack Connick. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/14922

Factsheet

Dendronotus diversicolor

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