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Frasnian bryozoans (Late Devonian) from the Khoshyeilagh Section, Alborz Mountains (northern Iran)

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Abstract

A bryozoan fauna containing seven species is described from the Upper Frasnian (Upper Devonian) rocks in the Khoshyeilagh Section, Alborz Mountains (northern Iran). The studied bryozoan assemblage includes one new trepostome species, Eridotrypella alborzensis sp. nov., an additional four species identified at species level: two trepostomes, Minussina akkayaensis Volkova, 1974 and Leptotrypella inaudita Morozova, 1961, and two rhabdomesine cryptostomes, Bigeyella mariae (Morozova, 1961) and Saffordotaxis multispinata (Morozova, 1955). Furthermore, two species are described in open nomenclature: the trepostome Schulgina sp. and the rhabdomesine cryptostome Nicklesopora sp. The studied fauna shows a close similarity at the species level between northern Iran and the Altai-Sayan Folded Belt (Russia), south China, and Transcaucasia.

Kurzfassung

Es wird eine Bryozoenfauna von sieben Arten aus dem Oberfrasnium (Oberdevon) von der Lokalität Khoshyeilagh, Alborz-Gebirge (Nordiran) beschrieben. Die untersuchte Bryozoenassoziation enthält eine neue trepostome Art, Eridotrypella alborzensis sp. nov, und vier Arten sind auf Artniveau bestimmbar: zwei trepostome Bryozoen, Minussina akkayaensis Volkova, 1974 und Leptotrypella inaudita Morozova, 1961, sowie zwei rhabdomesine cryptostome Bryozoen, Bigeyella mariae (Morozova, 1961) und Saffordotaxis multispinata (Morozova, 1955). Des Weitern werden zwei Arten in offener Nomenklatur beschrieben: trepostome Schulgina sp. und rhabdomesine cryptostome Nicklesopora sp. Die erforschte Fauna zeigt paläobiogeographische Beziehungen zum Altai (Russland), Südchina und dem Kaukasus auf dem Artniveau.

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Acknowledgments

We are grateful to Patrick Wyse Jackson, Dublin and Caroline Buttler, Cardiff for linguistic corrections and helpful comments on the manuscript. Hans Arne Nakrem, Oslo and an anonymous reviewer are thanked for helpful reviews and comments.

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Authors and Affiliations

  1. Kuzbass State Pedagogical Academy, Kuznetsov Str., 6, 654041, Novokuznetsk, Russia

    Zoya Tolokonnikova

  2. Institut für Geowissenschaften der Christian-Albrechts-Universität zu Kiel, Ludewig-Meyn-Str. 10, 24118, Kiel, Germany

    Andrej Ernst

  3. Department of Geology, Faculty of Science, Islamic Azad University of Zahedan, Zahedan, Iran

    Hamed Yarahmadzahi

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  1. Zoya Tolokonnikova
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Correspondence to Zoya Tolokonnikova.

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Tolokonnikova, Z., Ernst, A. & Yarahmadzahi, H. Frasnian bryozoans (Late Devonian) from the Khoshyeilagh Section, Alborz Mountains (northern Iran). Paläontol Z 85, 393–405 (2011). https://doi.org/10.1007/s12542-011-0107-z

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