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Article: First report of ostracods (Crustacea) associated with Bithynian (Anisian, Middle Triassic) Tubiphytes‐microbial reef in the North Dobrogean Orogen (Romania)

Papers in Palaeontology - Volume 4 Part 2 - Cover Image
Publication: Palaeontology
Volume: 4
Part: 2
Publication Date: May 2018
Page(s): 211 244
Author(s): Marie‐Béatrice Forel, and Eugen Grădinaru
DOI: 10.1002/spp2.1103
Addition Information

How to Cite

FOREL, M., GRăDINARU, E. 2018. First report of ostracods (Crustacea) associated with Bithynian (Anisian, Middle Triassic) Tubiphytes‐microbial reef in the North Dobrogean Orogen (Romania) . Papers in Palaeontology, 4, 2, 211-244. DOI: 10.1002/spp2.1103

Author Information

  • Marie‐Béatrice Forel - CR2P UMR7207 Muséum national d'Histoire naturelle 8 Rue Buffon Paris 75005 France
  • Eugen Grădinaru - Department of Geology Faculty of Geology & Geophysics University of Bucharest Bucharest Romania

Publication History

  • Issue published online: 07 May 2018
  • Manuscript Accepted: 03 November 2017
  • Manuscript Received: 27 July 2017

Funded By

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

Online Version Hosted By

Wiley Online Library
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Abstract

The Mahmudia Quarry is located in the North Dobrogean Orogen (Romania), representing the western tip of the Palaeotethys‐issued Cimmeride Orogenic System. One sample from the Tubiphytes‐microbial reef exposed in the quarry yielded an abundant well‐preserved ostracod assemblage of Bithynian, early Middle Anisian, Middle Triassic age. We report the occurrence of 56 ostracod species distributed among 23 genera. Ten species are newly described: Acratia caeracella sp. nov., Bairdia mandruella sp. nov., Bliviae sp. nov., Hungarella mahmudiaensis sp. nov., Kempfina tineriella sp. nov., Liuzhinia antalyaformis sp. nov., Lbithynica sp. nov., L. edvardgriegi sp. nov., Microcheilinella? contrariella sp. nov., Paracypris oanaella sp. nov. One species is renamed, Bairdia monostorii nom. nov. and the diagnosis of the genus Palaeocypridina is emended to include the central muscle scars pattern. The Tubiphytes ecosystem is complex with a multi‐layer food chain, as shown by the presence of diversified carnivorous nekto‐benthic ostracods, being both prey and predators of other organisms. The palaeoenvironmental requirements of the main ostracod taxa indicate a deposition in an open marine environment, on the outer platform‐upper slope zone, in accordance with information provided by other proxies. We discuss the relationship between ostracods and microbial mats during the Triassic and conclude that the composition of assemblages is related both to the characteristics of this chemosynthetically‐driven habitat and to bathymetry. However, some taxa, such as the genus Liuzhinia, are typical of Triassic microbial ecosystems. We perform the first analysis of ostracod provincialism during the Anisian and identify a distinct peri‐Palaeo‐Tethyan province.

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