Re: Janolus fuscus from Puget Sound

July 6, 2005
From: Jeff Goddard

Hi Bill,
The specimen in Jack Connick's photo [message #14142 ] is Hermissenda crassicornis. Janolus fuscus never has a bluish white line on the foot, nor white stripes on the cerata, and is not known to eat cnidarians. One color form of Hermissenda consistently has a white stripe on each ceras (e.g., see photo by Glen Miller and Jackie Hildering in their message #11055). Hermissenda is also a generalist and opportunistic predator quite capable of feeding on scyphozoans if it can reach them; I once found specimens with bright blue guts in the process of feeding on the chondrophore Velella velella stranded in tidepools.

Without a good view of the head or dorsal surface, these two species can be confused for each other.

Best wishes,
Jeff Goddard

goddard@lifesci.ucsb.edu

Goddard, J.H.R., 2005 (Jul 6) Re: Janolus fuscus from Puget Sound. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/14196

Thanks Jeff,
I felt something was wrong with either the identification or the food. I forgot about the ubiquitous Hermissenda!
Best wishes,
Bill Rudman

Rudman, W.B., 2005 (Jul 6). Comment on Re: Janolus fuscus from Puget Sound by Jeff Goddard. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/14196

Factsheet

Hermissenda crassicornis

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