Glaucus atlanticus and Glaucilla marginata

Paul Stewart

Wahroonga,, Australia

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Blue Glaucus, Sea Lizard or Blue Dragon. NSW – AUSTRALIA

We have a little cabin on a cliff by the sea. We listened to the storm all night as the waves crashed on the rocks below us. The next morning many ocean drifters had been washed onto the sand and into rock pools. I spent the morning photographing these amazing animals.

They can eat the stinging cells of other sea creatures and secrete them onto their skin. People who picked them up were stung severely.

This was a morning I will always remember.

I have not seen the creatures again.

“ A day in such serene enjoyment spent,
Is worth an age of splendid discontent.”
Moliere (pseudonym of Jean Baptiste Poquelin), Tartuffe (act IV, sc. 5)

On the left is Glaucus atlanticus. It is a species of medium-sized, floating, blue sea slug, a pelagic aeolid nudibranch, a marine opisthobranch gastropod mollusk in the family Glaucidae

The right of the photo is Glaucilla marginata.

"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."
The paragraph above is copied complete from the link below at sea slug forum. The original author is Bill Rudman.

Reference:
• Bergh, L.S.R. (1860). Om Forekomsten af Neldefiim hos Mollusker. Vidensk. Meddel. Naturh. Foren. Kjöbenhavn, p. 309-331, pl. 8

Authorship details
Rudman, W.B., 1998 (November 6) Glaucilla marginata Bergh, 1860. [In] Sea Slug Forum. Australian Museum, Sydney. Available from <a href="http://www.seaslugforum.net/factsheet.cfm?base=...">www.seaslugforum.net/factsheet.cfm?base=glaumar...

<a href="http://www.seaslugforum.net/factsheet.cfm?base=...">www.seaslugforum.net/factsheet.cfm?base=glauatl...

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