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Frasnian species of the Late Devonian conodont genus Ancyrognathus

Published online by Cambridge University Press:  14 July 2015

Gilbert Klapper
Gilbert Klapper*
Affiliation:
Department of Geology, The University of Iowa, Iowa City 52242
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Abstract

Detailed qualitative analysis of the Pa element and multielement analysis emphasizing the associated Pb element have led to the present revision of the Frasnian species of Ancyrognathus. Diagnostic characters of the Pa element, such as the platform outline, carinal pattern, and shape of the pit, as well as salient features of the Pb element, are the basis of this revision. As a consequence, the restriction in the definition of A. triangularis, formerly a heterogeneous concept including several discrete species, has in turn led to the recognition of a substantially increased number of species of Ancyrognathus.

The lowest occurrence of Ancyrognathus primus is used here to delimit the base of Zone 6 of the Montagne Noire Frasnian sequence. The exact relationship of the Montagne Noire zonation to the published standard zonation is problematical. For example, the base of the range of A. triangularis is possibly above the zone for which it is the nominal species in the standard zonation. Two new species are named herein, A. coeni and A. seddoni, both of which have been widely illustrated in the literature, and three new species are recognized in open nomenclature.

Type
Research Article
Information
Journal of Paleontology , Volume 64 , Issue 6 , November 1990 , pp. 998 - 1025
Copyright
Copyright © The Journal of Paleontology 

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