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<p>The article is a review of the main morphological and taxonomic features, stratigraphic ranges and diversity dynamics of Famennian pelekysgnathids. Descriptions of 23 species of <i>Pelekysgnathus</i>, including a new species, <i>Pelekysgnathus pazukhini</i>, and the listing of 3 species as <i>Pelekysgnathus</i>? have been made. <i>Pelekysgnathus pazukhini</i> is known from the uppermost Famennian and is one of the latest representatives of the genus. Based on the taxonomic revision, a taxonomic key was developed. <i>Pelekysgnathus</i> species share the ecological specialisation of shallow-water dwellers and can be used for biostratigraphy in the carbonate platform facies. The first appearance data of <i>Pel. talenti</i> and <i>Pel. australis</i> are roughly comparable to the lower boundary of the Famennian, and can therefore be considered as a potentially useful auxiliary tool for its diagnosis. <i>Pelekysgnathus pazukhini</i>, <i>Pel. ornamentalis</i>, <i>Pel. soarae</i>, <i>Pel. firmus</i> and <i>Pel.</i>? <i>guizhouensis</i> can be used as markers to indicate the Devonian–Carboniferous pre-boundary interval, as they are distributed in the uppermost Famennian (Middle <i>expansa</i>–Upper <i>praesulcata</i> (= <i>Bispathodus aculeatus aculeatus</i>-base of <i>Protognathodus kockeli</i>) zonal interval). The diversity of the Famennian pelekysgnathids increased stepwise to a maximum in the Upper <i>marginifera</i> Zone (= <i>Palmatolepis marginifera utahensis</i> Zone) and then gradually decreased throughout the Famennian. These diversity variations are similar to the diversity dynamics of the Famennian conodonts in general. </p>

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Famennian (Late Devonian) conodonts of the genus Pelekysgnathus

  • 期刊论文

  • 发表日期：

    2025年9月11日

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  • A. N. Plotitsyn,
  • A. V. Zhuravlev,
  • Yu. A. Gatovsky,
  • V. M. Nazarova

摘要

The article is a review of the main morphological and taxonomic features, stratigraphic ranges and diversity dynamics of Famennian pelekysgnathids. Descriptions of 23 species of Pelekysgnathus, including a new species, Pelekysgnathus pazukhini, and the listing of 3 species as Pelekysgnathus? have been made. Pelekysgnathus pazukhini is known from the uppermost Famennian and is one of the latest representatives of the genus. Based on the taxonomic revision, a taxonomic key was developed. Pelekysgnathus species share the ecological specialisation of shallow-water dwellers and can be used for biostratigraphy in the carbonate platform facies. The first appearance data of Pel. talenti and Pel. australis are roughly comparable to the lower boundary of the Famennian, and can therefore be considered as a potentially useful auxiliary tool for its diagnosis. Pelekysgnathus pazukhini, Pel. ornamentalis, Pel. soarae, Pel. firmus and Pel.? guizhouensis can be used as markers to indicate the Devonian–Carboniferous pre-boundary interval, as they are distributed in the uppermost Famennian (Middle expansa–Upper praesulcata (= Bispathodus aculeatus aculeatus-base of Protognathodus kockeli) zonal interval). The diversity of the Famennian pelekysgnathids increased stepwise to a maximum in the Upper marginifera Zone (= Palmatolepis marginifera utahensis Zone) and then gradually decreased throughout the Famennian. These diversity variations are similar to the diversity dynamics of the Famennian conodonts in general.