Etymology of Tylodina perversa

September 4, 1999
From: Josep Mª Dacosta

To: Dr. Bill RUDMAN

I'm the author of the opistobranch site at M@re Nostrum (http://www.marenostrum.org/opistobranquios)

I have read the information about Tylodina corticalis you have published in the Sea Slug Forum. I would like to ask you a question about Tylodina perversa. What is the etimology of this opisthobranch? I can't find any information related to it. Can you help me?
Yours sincerely
Josep Mª Dacosta

jmdacosta@marenostrum.org

Dacosta. J.M., 1999 (Sep 4) Etymology of Tylodina perversa. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/1299

Dear Josep,
It is possible Gmelin explained why he gave it the name perversa but often the early authors did not. In Latin perversum means 'turned the wrong way' so it may refer to the way the protoconch is turned. If Gmelin compared Tylodina with other limpet shells he would have noticed the protoconch coiled sinistrally (as in all opisthobranchs) rather than dextrally (as in all patellogastropods).

But that is just a guess.
Bill Rudman.

Rudman, W.B., 1999 (Sep 4). Comment on Etymology of Tylodina perversa by Josep Mª Dacosta. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/1299

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