First finds of early bajocian Leptosphinctes (ammonoidea: Perisphinctidae) in the North Caucasus, Russia

Cover Page

Cite item

Full Text

Open Access Open Access
Restricted Access Access granted
Restricted Access Subscription Access

Abstract

This paper discusses Early Bajocian Leptosphinctes found for the first time in the interfluve of the Kuban and Urup rivers (Karachay-Cherkessia). A microconch of L. (Kubanoceras) bolshensis sp. nov. is described. Fragments of macroconch shells recovered from the same nodule containing the holotype of the new species were identified as L. (Leptosphinctes) cf. garnieri Pavia; the holotype of this species comes from the Lower Bajocian Blagdeni Subzone of the Humphriesianum Zone in France. The new data are important for understanding the initial stage of the evolution of the family Perisphinctidae.

Full Text

Restricted Access

About the authors

V. V. Mitta

Borissiak Paleontological Institute, Russian Academy of Sciences; Cherepovets State University

Author for correspondence.
Email: mitta@paleo.ru
Russian Federation, Moscow; Cherepovets

References

  1. Безносов Н.В., Митта В.В. Позднебайосские и батские аммонитиды Северного Кавказа и Средней Азии. М.: Недра, 1993. 347 с.
  2. Безносов Н.В., Митта В.В. Каталог аммонитид и ключевые разрезы верхнего байоса – нижнего бата Северного Кавказа // Бюлл. КФ ВНИГНИ. 1998. № 1. С. 1–70.
  3. Безносов Н.В., Михайлова И.А. Систематика среднеюрских лептосфинктин и зигзагицератин // Палеонтол. журн. 1981. № 3. С. 47–60.
  4. Затворницкий А.Я. Среднеюрские глины по р. Кубани // Изв. Геол. ком-та. 1914. Т. 33. Вып. 250. С. 525–558.
  5. Кахадзе И.Р., Зесашвили В.И. Новый среднеюрский род Kubanoceras gen. nov. // Сообщ. АН Груз. ССР. 1955. Т. 16. № 9. С. 707–709.
  6. Кахадзе И.Р., Зесашвили В.И. Байосская фауна долины р. Кубани и некоторых ее притоков // Тр. Геол. ин-та АН Груз. ССР. Сер. геол. 1956. Т. 9 (14). Вып. 2. 55 c.
  7. Митта В.В. Род Keppleritiana gen. nov. (Stephanoceratidae, Ammonoidea) из верхнего байоса Северного Кавказа // Палеонтол. журн. 2017. № 3. С. 26–35.
  8. Митта В.В. О древнейших Leptosphinctes (Ammonoidea: Perisphinctidae) зоны Niortense верхнего байоса (средняя юра) Северного Кавказа // Палеонтол. журн. 2021а. № 1. С. 39–47.
  9. Митта В.В. О первых находках Infragarantiana (Ammonoidea: Perisphinctidae) в зоне Niortense верхнего байоса (средняя юра) Северного Кавказа // Палеонтол. журн. 2021б. № 6. С. 33–39.
  10. Митта В.В. Род Lissoceras (Ammonoidea: Lissoceratidae) в верхнем байосе (средняя юра) Северного Кавказа // Палеонтол. журн. 2022а. № 5. С. 37–43.
  11. Митта В.В. Род Cadomites (Ammonoidea: Stephanoceratidae) в верхнем байосе – нижнем бате (средняя юра) бассейна р. Кубань (Северный Кавказ) // Палеонтол. журн. 2022б. № 6. С. 33–41.
  12. Митта В.В., Бакарюкина Ю.А. Новые данные о байос–батских Parkinsoniidae (Аmmonoidea, Perisphinctoidea) // Палеонтол. журн. 2020. № 3. С. 32–42.
  13. Arkell W.J. Jurassic Ammonitina // Treatise on Invertebrate Paleontology. Pt. L. Mollusca. N.Y. – Lawrence: Geol. Soc. Amer.; Univ. Kansas Press, 1957. P. L232–L344.
  14. Buckman S.S. Type Ammonites. Bd III. L.: Wheldon & Wesley, 1919–1921. P. 1–64.
  15. Dietl G. Die Ammoniten-Gattung Leptosphinctes aus dem südwestdeutschen Subfurcaten-Oolith (Bajocium, Mittl. Jura) // Stuttg. Beitr. Naturk. Ser. B. 1980. № 66. S. 1–49.
  16. Énay R., Howarth M.K. Systematic descriptions of the Perisphinctoidea // Treatise Online Nr. 120. Pt L, revised. V. 3B. Chapt. 7. Paleontol. Inst. Univ. Kansas, 2019. 184 p.
  17. Fernández-López S. El Bajociense en la Cordillera Ibérica. Madrid: Univ. Complut. Madrid, 1985. Pt. 1 (p. 1–532), pt. 2 (p. 533–850), pt. 3 (atlas, 27 p., 67 pl.).
  18. Galácz A. Early perisphinctid ammonites from the early/late Bajocian boundary interval (Middle Jurassic) from Lókút, Hungary // Geobios. 2012. T. 45. P. 285–295.
  19. Mitta V.V. Ammonites and stratigraphy of the Upper Bajocian Strenoceras niortense Zone in the interfluve between the Kuban and Urup rivers (Northern Caucasus) // Paleontol. J. 2021. V. 55. № 12. P. 1458–1475.
  20. Mitta V.V. Superfamily Perisphinctoidea (Ammonoidea) in the Bajocian – Lower Bathonian of the Kuban River basin (Northern Caucasus, Russia) // Paleontol. J. 2024. V. 58. № 1. P. 44–55.
  21. Pavia G. Ammoniti del Baiociano superiore di Digne (Francia SE, Dip. Basses-Alpes) // Boll. Soc. Paleontol. Ital. 1973 (1971). V. 10. № 2. P. 75–142.
  22. Pavia G. Ammoniti e biostratigrafia del Baiociano inferiore di Digne (Francia S.E., Dip. Alpes-Haute Provence) // Mus. Reg. Sci. Nat. Torino. 1983. Monogr. II. P. 1–254.
  23. Rioult M., Contini D., Elmi S., Gabilly J. Bajocien // Biostratigraphie du Jurassique ouest-européen et méditerranéen / Coord. Cariou É., Hantzpergue P. Pau, 1997. P. 51–54 (Bull. Centre Rech. Elf Explor.-Prod. Mém. 17).
  24. Wetzel W. Uber einige stammesgeschichtlich interessante Ammonitenarten des obersten Bajocien // N. Jb. Miner. Geol. Paläontol. Abt. B. 1936. Beil.-Bd 75. S. 527–542.
  25. Wetzel W. Die Bielefelder Garantianen, Geschichte einer Ammonitengattung // Geol. Jb. 1954. Bd 68. S. 547–586.

Supplementary files

Supplementary Files
Action
1. JATS XML
Download
2. Fig. 1. Location of sites: a – general scheme, the outline of the detailed map is shown in the frame; b – map of the mentioned outcrops (31, 31a).

Download (505KB)
Indexing metadata
3. Fig. 2. Outcrop 31a (left bank of the Kyafar River below the mouth of the Bizhgon River): a – general view, vegetation on the left is developed at the mouth of the ravine (location 31), b – Cadomites (Cadomites) cf. lissajousi Roché, in situ.

Download (762KB)
Indexing metadata
4. Fig. 3. Bajocian section on the left bank of the Kyafar River, localities No. 31 and 31a (after: Mitta, 2021, with modifications and additions). Designations: 1 - silty-sandy clays, 2 - argillite-like clays, 3 - lenses, 4 - concretions; 5, 6 - levels of ammonite finds: 5 - in autochthonous burial, 6 - in redeposited concretions.

Download (529KB)
Indexing metadata
5. Fig. 4. Leptosphinctes (Kubanoceras) aff. cleistus Buckman, specimen PIN, No. 5546/413, an adult shell with a complete body chamber and aperture with preserved ears: a – ventral side, b – lateral side; the asterisk (*) marks the beginning of the body chamber; Karachay-Cherkessia, Zelenchuksky District, the Kyafar River below the mouth of the Bizhgon River, locality 31a; talus of the lower Upper Bajocian; author's collection, 2024. Length of scale bar is 10 mm.

Download (162KB)
Indexing metadata
6. Fig. 5. Leptosphinctes (Kubanoceras) bolshensis sp. nov., holotype PIN, no. 5546/410, an adult shell with a complete body chamber and an aperture with partially preserved ears; the asterisk (*) marks the beginning of the body chamber: a – from the aperture, b – from the side, c – from the ventral side; Karachay-Cherkessia, Zelenchuksky District, the Kyafar River below the mouth of the Bizhgon River, locality 31a; layer 1, from a redeposited lower Bajocian concretion; author's collection, 2023. Designation: J – ammonoid jaw. Scale bar length is 10 mm.

Download (157KB)
Indexing metadata
7. Fig. 6. Leptosphinctes (Leptosphinctes) cf. garnieri Pavia: a – specimen PIN, no. 5546/410, incompletely preserved juvenile shell from the side, buried together with the holotype of L. (Kubanoceras) bolshensis sp. nov. [m] (in the background); b – specimen PIN, no. 5546/411, fragment of body chamber from the side; c – specimen PIN, no. 5546/412, part of internal whorls from the side; Karachay-Cherkessia, Zelenchuksky District, Kyafar River below the mouth of the Bizhgon River, locality 31a; all – layer 1, from one redeposited lower Bajocian concretion; author’s collection, 2023. Scale bar length is 10 mm.

Download (189KB)
Indexing metadata

Copyright (c) 2024 Russian Academy of Sciences