Re: Tiny, elaborate creature at Stradbroke Island, Queensland

March 17, 2009
From: Paul Stewart

Concerning message #21205:

Hi Bill,

With reference to the email above I wonder if the animal is in fact Glaucilla marginata

In Glaucus the cerata are arranged in a single row in each arch while in Glaucilla there are multiple rows.

In the link below I have photographed both species for comparison.

http://www.flickr.com/photos/29056374@N04/3344062842/


Paul Stewart (flicker username paulhypnos)

hypnos1@live.com.au

Stewart, P. A., 2009 (Mar 17) Re: Tiny, elaborate creature at Stradbroke Island, Queensland. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/22333

Dear Paul,

It's possible the photo you refer to is Glaucilla but I can only see one row of cerata in the photo of the washed up animal. There are limits to what you can do from a single photo. I usually say 'I think' or 'I am pretty sure' when I identify such photos but as the Fact Sheets of both species link to each I am sure that if Ken wanted further information he could find it easily.

I note the last paragraph on your Flicker page is a direct copy from the Forum's Glaucilla marginata Fact Sheet.

Both Glaucus and Glaucilla appear to be "monotypic" genera. That is each genus has only one species. The main external difference is that in Glaucus the cerata are arranged in a single row in each arch while in Glaucilla there are multiple rows.

I don't mind my work being used - that's what it is there for, and I am grateful for your link to the Glaucus atlanticus Fact Sheet, but when paragraphs are just copied complete as you have here, then the original author should be cited.

Best wishes,
Bill Rudman

Rudman, W.B., 2009 (Mar 17). Comment on Re: Tiny, elaborate creature at Stradbroke Island, Queensland by Paul Stewart. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/22333

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