Eubranchus olivaceus? from British Columbia

March 5, 2008
From: Laura McLeod


I thought I'd add another specimen into the Eubranchus mix. I think this is Eubranchus olivaceus, having used the Kozloff Marine Invertebrates key for the Pacific Northwest. It was collected on hydroids growing off the docks and these pictures were taken in the lab. I have also included a shot of the radula, taken under a light microscope at 40x with a scale bar of 20um.

Locality: Bamfield , 0.5 m, British Columbia, Canada, Pacific Ocean, 15 July 2007, On hydroids on the docks. Length: 2 mm. Photographer: Laura McLeod.

Laura McLeod

McLeod, L.E., 2008 (Mar 5) Eubranchus olivaceus? from British Columbia. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from

Dear Laura,

Aren't these little devils fun. Yes indeed this is Eubranchus rupium (Moller, 1842), previously E. olivaceus(O'Donoghue, 1922). I cannot make out the lateral teeth in your radula prep, although the 5-6 denticles on the rachidian tooth are obvious. Bottom line, the very distinctive coloration on the body gives it away.

Best wishes,
Dave Behrens

Behrens, D.W., 2008 (Mar 5). Comment on Eubranchus olivaceus? from British Columbia by Laura McLeod. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from


Eubranchus rupium

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