Lingulates of the Monograptus belophorus Biozone (Motol Formation, Sheinwoodian, Wenlock) of the Barrandian area, Czech Republic: insight into remarkable lingulate brachiopod diversity in the Silurian

 

Authors: Mergl M

Published in: Bulletin of Geosciences, volume 99, issue 1; pages: 1 - 42; Received 27 November 2023; Accepted in revised form 3 March 2024; Online 14 April 2024

Keywords: Sheinwoodian, Silurian, organophosphatic brachiopods, Barrandian,

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Abstract

Lingulate brachiopods are described from the mid-Sheinwoodian “Miraspis” Limestone in the famous Loděnice Špičatý vrch locality near Loděnice in the Barrandian area. Twenty-three species have been determined, some only identified to generic or family rank due to rarity or poor preservation. Two new genera Platylops (Subfamily Elliptoglossinae) and Praethele (Family Orbiculoideidae) and three new species are described: Schizotreta elegantia sp. nov., Praethele postvexata sp. nov., and Orbaspina involuta sp. nov. Several poorly known species erected by Joachim Barrande in l879 are redescribed and their taxonomic rank and stratigraphic occurrences are elucidated. Species assigned to genera Pseudolingula, Barrandeoglossa, Kacakiella, Wadiglosella, Lingulops, Schizocrania, Schizobolus, Acrosaccus, Sterbinella, Artiotreta, Acrotretella, Havlicekion and Opsiconidion are described. The brachiopods come from sediments where Cooksonia barrandei and other earliest land plants have been observed. The unexpectedly high taxonomic diversity indicates a favourable marine environment in the surroundings of a volcanic island(s). The common presence of the widespread acrotretid brachiopods and small but remarkably diverse discinid brachiopods corroborate the dominance of the epibenthic or epiphytic life habit of lingulates over the burrowing style of the pedunculate forms.

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