RE: paleonet Conodonts

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Title: Re: paleonet Conodonts

Mark and others,

Thanks, this is exactly what I wanted to know. I had assumed it had to do with the original position, but did not know the details. Unfortunately most of our literature is still out of reach in the New Orleans office, so I could not check it there.

Thanks all!

Shirley van Heck

-----Original Message-----
From: paleonet-owner@nhm.ac.uk [mailto:paleonet-owner@nhm.ac.uk]On Behalf Of Mark Purnell
Sent: Thursday, January 05, 2006 4:56 PM
To: paleonet@nhm.ac.uk
Subject: Re: paleonet Conodonts

Pa and Pb are morphological categories of conodont elements; they are different parts of the conodont skeleton (a single species can have P, M and S elements - notational scheme devised by Sweet and Schonlaub).
Pa elements in many post-Ordovician faunas have serrated blade-shaped or molar like morphologies; Pb are generally arched serrated blade-shaped elements.
We now know the actual positions of these elements in many taxa: P1 elements (= Pa morphologies) were the most posterior parts of the oropharyngeal skeleton, P2 elements (=Pb) lay just in front of them.
More than you wanted to know, probably.

Mark

On 5/1/06 20:55, "van Heck, Shirley SIEP-EPT-SCRT" <Shirley.vanHeck@Shell.Com> wrote:

Can anyone tell me what the abbreviations Pa and Pb mean behind the names of conodonts?

Thanks,

groeten / regards,

Shirley E. van Heck
Staff stratigrapher
Shell International Exploration and Production
200, N. Dairy Ashford
Houston, Texas 77079
USA
Tel: + 1 281 544 2638
Email: Shirley.vanheck@shell.com

Dr Mark A. Purnell
Department of Geology
University of Leicester
University Road
Leicester LE1 7RH
UK
Tel +44 116 252 3645 Fax +44 116 252 3918
www.le.ac.uk/gl/map2/