Ontogenetic and intraspecific variation in the late Emsian – Eifelian (Devonian) conodonts Polygnathus serotinus and P. bultyncki in the Prague Basin (Czech Republic) and Nevada (western U.S.)

Klapper, G.; Vodrážková, S.

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Tytuł artykułu

Ontogenetic and intraspecific variation in the late Emsian – Eifelian (Devonian) conodonts Polygnathus serotinus and P. bultyncki in the Prague Basin (Czech Republic) and Nevada (western U.S.)

Autorzy

Klapper G. , Vodrážková S.

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Abstrakty

Samples from populations of Polygnathus serotinus Telford 1975 and P. bultyncki Weddige 1977 from the Prague Basin and Nevada display normal variation for Devonian conodont species. A considerable number of previous authors, however, have proposed unnecessary synonyms of these two species, primarily because they have not recognized ontogenetic variation. In contrast, we interpret the variation as ontogenetic as well as intraspecific and present detailed synonymies as a result. A third species, P. praetrigonicus Bardashev 1992, which has been carried in open nomenclature for many years, is an important indicator of the basal costatus Zone in the Prague Basin, New York, and Nevada. We review the stratigraphic distribution of these three species and the conodont zonation across the Emsian-Eifelian (Lower-Middle Devonian) boundary. Polygnathus pseudocostatus sp. nov. (partitus-costatus zones, central Nevada) is described herein. We have observed a decrease in the pit size during ontogeny in P. bultyncki although we have not observed enough specimens to rule out intraspecific versus ontogenetic variation.

Słowa kluczowe

Devonian Emsian-Eifelian conodont zonation ontogenetic and intraspecific variation taxonomic revision

dewon ontogeneza zmiana wewnątrzgatunkowa rewizja taksonomiczna

Wydawca

Faculty of Geology of the University of Warsaw
Komitet Nauk Geologicznych PAN

Czasopismo

Acta Geologica Polonica

Rocznik

2013

Tom

Vol. 63, no. 2

Strony

153--174

Opis fizyczny

Bibliogr. 101 poz., il.

Twórcy

autor

Klapper G.

g-klapper@northwestern.edu

Department of Earth and Planetary Sciences, Northwestern University, Evanston, IL 60208, USA.

autor

Vodrážková S.

stana.vodrazkova@seznam.cz

GeoZentrum Nordbayern, Fachgruppe Paläoumwelt, Friedrich-Alexander-Universität Erlangen-Nürnberg, Loewenichstr. 28, Erlangen, Germany and Czech Geological Survey, P.O.B. 85, 118 21 Prague 1, Czech Republic.

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