Re: Three? Halgerda from Japan

March 20, 2000
From: C. Carlson & P.J.Hoff


Atsushi's 5mm Halgerda appears to be H. diaphana.  The only thing we would question might be the size of the spotting on branchia and rhinophores.  I have a number of H. diaphana photos (courtesy of Bob Bolland) and all except the smallest 29mm specimen have fine spotting.  The 29mm specimen has larger spots more widely spaced.

I have included two scans of some not so good shots of H. guahan

Clay & Patty Jo

Carlson, C. & Hoff, P.J., 2000 (Mar 20) Re: Three? Halgerda from Japan. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from

Dear Clay & patty Jo,
Thanks for the photos and for clarifying the juvenile photo.
Best wishes,
Bill Rudman.


Halgerda diaphana

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