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Co-existence of interarea and palintrope: contribution of a new pentameride brachiopod from the Upper Ordovician of Sweden

Published online by Cambridge University Press:  01 September 2007

Anthony D. Wright
Affiliation:
Department of Geology, University of Leicester, University Road, Leicester LE1 7RH, UK. E-mail: adw11@le.ac.uk
Rong Jia-Yu
Affiliation:
State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, Nanjing 210008, People’s Republic of China. E-mail: jyrong@nigpas.ac.cn

Abstract

A new genus of pentameride brachiopod, Costilamnulella, described herein from the middle Ashgill of Sweden, is particularly interesting in that the ventral valve possesses both an interarea and a palintrope. Brachiopods normally have one or the other, but both structures do occur amongst the pentamerides, e.g. in Clorinda, Anastrophia and Brevilamnulella. The presence of these structures in three separate pentameride families indicates the persistence of the more primitive condition of an interarea whilst the more advanced palintrope is becoming established. Costilamnulella is interpreted as a restricted side line of the main development of the more widely occurring Brevilamnulella, which survived the end-Ordovician event and may have shared its ancestry with the ubiquitous Clorinda.

Type
Research Article
Copyright
Copyright © Royal Society of Edinburgh 2008

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