Re: Growth stages in Dolabella auricularia

January 2, 2003
From: Alicia Hermosillo

Dear Bill,
I was looking at Mary Jane´s pictures of growth stages of Dolabella auricularia. Please compare her number 3 image with my unknown Aplysiid. Would you say that is what my unknown species is? May be I have solved one unidentified..
Cheers and a happy branching New Year!!!
Ali

gueri25@hotmail.com

Dear Ali,
Thanks for the New Year greetngs and thanks for thinking about the 'unidentified'. I had assumed from your photos that your animal had two Aplysia-like parapodia, but on having a second look it seems the parapodial cavity is closed except for an anterior siphon? I have copied one of your photos alongside. If this is so, then I wouldn't be surprised if your animal - and probably Mary Jane's - is Notarchus rather than Dolabella. I will have to check through my field notes but I am pretty sure the flattened disc at the back of Dolabella is quite obvious in small juveniles, which is rather different from both your animal and Mary Jane's. One noticeable feature of Notarchus is its spectacular swimming behaviour, where it squirts water out of its single siphon to 'jet' around in a tumbling motion. Did you see any indication of that?

Thanks for drawing your 'unidentified' to my attention, and making me have a second look at Mary Jane's photos. I'll move your animal temporarily to the Dolabella page until I hear from you, but I am pretty sure Notarchus is a better id. You mention they were quite common. Did they grow any bigger?
Best wishes,
Bill Rudman

Rudman, W.B., 2003 (Jan 2). Comment on Re: Growth stages in Dolabella auricularia by Alicia Hermosillo. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/8768

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