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Taxonomy and distribution of the Ordovician conodontDrepanodus arcuatus Pander, 1856, and related species

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Zusammenfassung

Drepanodus arcuatusPander, 1856, ist eine der am weitesten verbreiteten Conodontenarten des Ordo-viziums, und ihre stratigraphische Reichweite umfasst nahezu das gesamte Ordovizium. Zur besseren Definition und Ab-grenzung dieser Art wurde Material aus derPrioniodus-ele-gans-Zone untersucht, das vonPander’s Typlokalitat in der Nahe von St. Petersburg stammt. Umfangreiche Sammlungen vonD. arcuatus, die aus dem ZeitabschnittPaltodus-deltifer-Zone (Tremadoc) bis in die basalePygodus-serra-Zone (Dar-riwilian) stammen, wurden untersucht, um die Variationsbrei-te innerhalb der Spezies zu dokumentieren. Das meiste Material vonD. arcuatus kommt aus dem Arenigium. Im Rahmen dieser Revision wurden zwei weitere Arten vonDrepanodus in den schwedischen Sammlungen identifiziert. Zu-mindest eine dieser Arten,Drepanodus reclinatus (LlND-STROM, 1955), besitzt eine weite Verbreitung und ist aus Nordamerika und Siidkina bekannt. Diese Spezies ist wieDrepanodus parformis n. sp. viel seltener alsD. arcuatus, beide Arten scheinen jedoch dieselbe stratigraphische Reichweite wieD. arcuatus zu besitzen. Sowohl biofazielle als auch pala-obiogeographische Aspekte der hier diskutierten Arten wer-den dokumentiert.

Abstract

Drepanodus arcuatusPander, 1856, is one of the geographically most widely distributed conodont species in the Ordovician, and has been reported to range practically throughout the entire Ordovician System. Topotype material from thePrioniodus elegans Zone in the St. Petersburg area of Russia has been studied in order to better define the species, and largeD. arcuatus collections from Sweden, ranging in age from the TremadocianPaltodus deltifer Zone and into the basalPygodus serra Zone in the Darriwilian, have been examined to estimate the limits of variation. Most of the investigated material is of Arenigian age. In this process, two additional speciesof Drepanodus were identified in the Swedish collections, and at least one of these,Drepanodus reclinatus (Lindström, 1955), also has a rather wide distribution in North America and southern China. This species and the new species,Drepanodus parformis n. sp., are much less common thanD. arcuatus in the great majority of the investigated samples, but they seem to have largely the same stratigraphical range asD. arcuatus. Biofacies patterns as well as palaeogeo-graphic distribution of the taxa discussed are documented.

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  1. Tatiana Ju. Tolmacheva

    Present address: VSEGEI, Sredni prospekt 74, 199026, St. Petersburg, Russia

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  1. Department of Geology, Lund University, Sölvegatan 13, 223 62, Lund, Sweden

    Anita M. Lofgren

  2. Department of Earth Sciences, Historical Geology and Paleontology, Uppsala University, Norbyvägen 22, 752 36, Uppsala, Sweden

    Tatiana Ju. Tolmacheva

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Lofgren, A.M., Tolmacheva, T.J. Taxonomy and distribution of the Ordovician conodontDrepanodus arcuatus Pander, 1856, and related species. Paläontol Z 77, 203–221 (2003). https://doi.org/10.1007/BF03004569

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  • DOI: https://doi.org/10.1007/BF03004569

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