The First Finds of Representatives of the Order Acrotretida Kuhn from the Frasnian (Upper Devonian) Deposits of Komi Respublic

T. N. Smirnova; Смирнова Т. Н.; E. A. Zhegallo; Жегалло Е. А.

doi:10.31857/S0031031X23020137

The First Finds of Representatives of the Order Acrotretida Kuhn from the Frasnian (Upper Devonian) Deposits of Komi Respublic

Authors: Smirnova T.N.¹, Zhegallo E.A.²
Affiliations:
1. Lomonosov Moscow State University
2. Borissak Paleontological Institute, Russian Academy of Sciences
Issue: No 2 (2023)
Pages: 65-68
Section: Articles
URL: https://rjsvd.com/0031-031X/article/view/673570
DOI: https://doi.org/10.31857/S0031031X23020137
EDN: https://elibrary.ru/LENFVD
ID: 673570

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Abstract

The structure and microstructure of the shell substance Acrotretella sp. on the protegulum, brephic and adult shell. The structure of the secondary layer, represented by interlayers with columnar-lamellar and spherulite structures, is characteristic. Wrinkles are developed along the edges of the shell.

Keywords

Acrotretella, Upper Devonian, Frasnian stage, microstructure, protegulum, columnar-laminae structure, spheroidal layer

About the authors

T. N. Smirnova

Lomonosov Moscow State University

Author for correspondence.
Email: smirnovatatiana77@mail.ru
Russia, 119991, Moscow

E. A. Zhegallo

Borissak Paleontological Institute, Russian Academy of Sciences

Author for correspondence.
Email: ezheg@paleo.ru
Russia, 117647, Moscow

References

Mergl M. Lingulate brachiopods of Silurian and Devonian of the Barrandian (Bohemia, Czech Republic) // Acta Mus. Natl. Pragae, Ser. B. Histor. Natur. Praha. 2001. V. 57. P. 1–49.
Treatise on Invertebrate Paleontology. Pt H. Brachiopoda. Revised. V. 2, 3. Lawrence: Univ. Kansas Press, 2000. 919 p.
Treatise on Invertebrate Paleontology. Pt H. Brachiopoda. Revised. V. 6. Suppl. Lawrence: Univ. Kansas Press, 2007. 956 p.
Williams A., Holmer L. Ornamentation and shell structure of acrotretoid brachiopods // Palaeontology. 1992. V. 35. Pt 3. P. 675–692.