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Article: Middle Triassic (Anisian, Bithynian) gastropods from North Dobrogea (Romania) and their significance for gastropod recovery from the end‐Permian mass extinction event

Papers in Palaeontology - Volume 4 Part 4 - Cover
Publication: Palaeontology
Volume: 4
Part: 4
Publication Date: November 2018
Page(s): 477 512
Author(s): Alexander Nützel, Andrzej Kaim, and Eugen Grădinaru
DOI: 10.1002/spp2.1115
Addition Information

How to Cite

NüTZEL, A., KAIM, A., GRăDINARU, E. 2018. Middle Triassic (Anisian, Bithynian) gastropods from North Dobrogea (Romania) and their significance for gastropod recovery from the end‐Permian mass extinction event. Papers in Palaeontology, 4, 4, 477-512. DOI: /doi/10.1002/spp2.1115

Author Information

  • Alexander Nützel - SNSB‐Bayerische Staatssammlung für Paläontologie und Geologie Department of Earth & Environmental Sciences, Palaeontology & Geobiology GeoBio‐Center LMU Richard‐Wagner‐Str. 10 80333 München Germany
  • Andrzej Kaim - Institute of Paleobiology Polish Academy of Sciences ul. Twarda 51/55, 00‐818 Warszawa Poland
  • Eugen Grădinaru - Department of Geology Faculty of Geology & Geophysics University of Bucharest Bd. Bălcescu Nicolae 1 RO‐010041 Bucharest Romania

Publication History

  • Issue published online: 03 November 2018
  • Manuscript Accepted: 28 February 2018
  • Manuscript Received: 07 November 2017

Funded By

UEFISCDI . Grant Number: CNCSIS PNCDI‐II‐ID‐1960/2009‐2010

Online Version Hosted By

Wiley Online Library
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Abstract

A new early middle Anisian (Bithynian) gastropod fauna is described from the Mahmudia quarry in North Dobrogea, Romania. At least 22 species are reported, nearly all of them from Tubiphytes‐limestones which represent a microbial buildup. Twenty species from Tubiphytes‐buildup limestones are characterized, ten of which in open nomenclature due to insufficient preservation. One genus (Murchisonietta gen. nov) and ten species are described as new. The new species are Euryalox applanatus, Rasatomaria multistriata, Sisenna inaequistriata, Worthenia (Worthenia) dobrogeana, Worthenia (Humiliworthenia) microstriata, Worthenia (Humiliworthenia) anisica, Marmolatella iordanae, Ladinaticella simionescui, Murchisonietta acuta and Coelostylina micropunctata. The present fauna is one of the most diverse Anisian gastropod faunas known to date and sheds light on the pattern of ongoing recovery from the end‐Permian mass extinction event. It is dominated by Neritimorpha, Caenogastropoda and Pleurotomariida both in abundance and number of species. Diversity of Pleurotomariida strongly exceeds that of any known Early Triassic gastropod fauna and suggest a pronounced rebound of this group. High‐spired smooth caenogastropods (Omphaloptycha and Polygyrina) are relatively abundant but for the most part not enough well preserved for species identification. The present gastropod fauna is part of a diverse invertebrate fauna probably comprising more than 50 species with gastropods being the most diverse followed by bivalves and brachiopods. They were microbial‐buildup dwellers while metazoan frame‐builders, especially corals, were still absent as consequence of the end‐Permian mass extinction event. The Mahmudia fauna suggests that metazoan reefs recovered more slowly than benthic faunas.

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