Systematic position of the brachiopod species  Pugnoides korsakpaica  Nalivkin and  Leiorhynchus kiselicus  Nalivkin (order rhynchonellida)

А. V. Pakhnevich; Пахневич А. В.

doi:10.31857/S0031031X24060063

Systematic position of the brachiopod species Pugnoides korsakpaica Nalivkin and Leiorhynchus kiselicus Nalivkin (order rhynchonellida)

Authors: Pakhnevich А.V.¹^,2
Affiliations:
1. Borissiak Paleontological Institute, Russian Academy of Sciences
2. Joint Institute for Nuclear Research, Moscow Region
Issue: No 6 (2024)
Pages: 56-65
Section: Articles
URL: https://journals.rcsi.science/0031-031X/article/view/284168
DOI: https://doi.org/10.31857/S0031031X24060063
EDN: https://elibrary.ru/QIHSNL
ID: 284168

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Abstract
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Abstract

A revision of the type material of the species Pugnoides korsakpaica Nalivkin, 1937 and Leiorhynchus kiselicus Nalivkin, 1979 was carried out using X-ray microtomography. It was not possible to clarify the systematic position of the species P. korsakpaica, but internal shell structures were discovered: a septum and a large septalium. In the type series of L. kiselicus, specimens belonging to different genera were identified. Most of the specimens are assigned to the species Orbiculatisinurostrum kiselicum. A new species has been described – Paropamisorhynchus lytvensis sp. nov. The punctae were not found in the shell matter of all specimens.

Keywords

Pugnoides korsakpaica, Leiorhynchus kiselicus, Orbiculatisinurostrum, Paropamisorhynchus, Famenian, Tournaisian, X-ray microtomography

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About the authors

А. V. Pakhnevich

Borissiak Paleontological Institute, Russian Academy of Sciences; Joint Institute for Nuclear Research, Moscow Region

Author for correspondence.
Email: alvpb@mail.ru
Russian Federation, Moscow; Dubna

References

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2. Fig. 1. Virtual cross-sections of Orbiculatisinurostrum kiselicum shells (Nalivkin, 1979): a–z – paratype TsNIGR Museum, no. 3085/540; i–p – paratype TsNIGR Museum, no. 3085/538; Urals, bank of the Ryauzyak River; Upper Devonian, Upper Famennian, Lytva Horizon. Designations: zbp – dental plates, zp – hinge plate, k – crurae, ko – crural bases, s – septa, sp – septalium. Scale bar – 1 mm. Next to each section there is a number corresponding to its distance from the umbo of the ventral valve. Circular elements on the sections are rotation artifacts; they are not morphological structures of the shells.