Hexabranchus 'aureomarginatus' from Hawaii

July 30, 2001
From: Scott Johnson

Hi Bill,

As promised, here is some information on the 'species' or 'form' Ostergaard named Hexabranchus aureomarginatus. They are common in Hawaii, but less so than the larger Hexabranchus sanguineus. Those that fall into the aureomarginatus form always have several features in common that distinguish them from sanguineus. These are the yellow margin, opaque white frosty-like patches on the dorsum, and orange (rather than red) rhinophores. While I have not looked extensively, I have not noticed any consistent differences between the radulae of H. sanguineus and H. aureomarginatus, but one other interesting difference is in the egg masses. Typical H. sanguineus produce large, dark pink, ruffled egg masses similar to that pictured in David Harasti's message. The aureomarginatus form produces much smaller, much less ruffled, and light pink egg masses as shown in the attached photo. Adding more confusion to the issue is another Hawaiian Hexabranchus described by Ostergaard, H. pulchellus. More on that in another message.

Scott

johnson@kmr.ll.mit.edu

Johnson, S., 2001 (Jul 30) Hexabranchus 'aureomarginatus' from Hawaii. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/4953

Dear Scott,
I wondered how long before the colour 'forms' of Hexabranchus became a talking point on the Forum. I'll keep them all under the 'umbrella' of Hexabranchus sanguineus, but as Bernard Picton would almost surely say, this is a question we might invite the molecular chemists to have a look at. I like the egg mass difference.
best wishes,
Bill Rudman

Rudman, W.B., 2001 (Jul 30). Comment on Hexabranchus 'aureomarginatus' from Hawaii by Scott Johnson. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/4953

Factsheet

Hexabranchus sanguineus

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