An Exceptionally Large Lower Jaw of Lytoceratoidea from the Upper Bajocian (Middle Jurassic) of Northern Caucasus

Cover Page

Cite item

Full Text

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

Abstract

A large-sized upper jaw of an ammonite from the Niortense Zone of the Upper Bajocian of the Kuban basin (Karachay-Cherkessia) is described. In its anterior part it has a pointed calcified structure (rhyncholite). Judging by its shape and size, the upper jaw belonged to a species of the genus Lytoceras (family Lytoceratidae), the lower jaw of which was already described from the same area immediately below in the section. The presence of a rhyncholite allows us to attribute the new finding to the rhynchaptychus type of ammonoid jaw apparatus. This is the earliest known complete jaw of this type and, to date, the only known upper jaw of Lytoceratina. Probably, calcification of the anterior part of the jaw apparatus of ammonoids of the suborders Lytoceratina and Phylloceratina was a normal process occurring as the mollusk matured.

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, 117647; Cherepovets, 162602

A. A. Mironenko

Geological Institute, Russian Academy of Sciences

Email: paleometro@yandex.ru
Russian Federation, Moscow, 119017

References

  1. Безносов Н.В. Юрские аммониты Северного Кавказа и Крыма. Phylloceratina и Lytoceratina. Л.: Гостоптехиздат, 1958. 118 с.
  2. Комаров В.Н. Ринхолиты Горного Крыма. М.: ООО “ТИИЦ”, 2021. 210 с.
  3. Мироненко А.А., Комаров В.Н. Новые находки ринхолитов в средней и верхней юре Крыма // Изв. высш. учебн. заведений. Геол. и разведка. 2019. № 1. С. 5–15.
  4. Мироненко А.А., Митта В.В. О новых находках челюстей цефалопод в верхнем байосе (средняя юра) Северного Кавказа (Карачаево-Черкесия) // Палеонтол. журн. 2020. № 5. С. 38–48.
  5. Митта В.В. Род Spiroceras (Spiroceratidae, Ammonoidea) в верхнем байосе Северного Кавказа // Палеонтол. журн. 2017а. № 2. С. 26–34.
  6. Митта В.В. Род Keppleritiana gen. nov. (Stephanoceratidae, Ammonoidea) из верхнего байоса Северного Кавказа // Палеонтол. журн. 2017б. № 3. С. 26–35.
  7. Митта В.В. Необычайно крупная нижняя челюсть Lytoceratoidea из верхнего байоса (средняя юра) Северного Кавказа // Палеонтол. журн. 2021. № 2. С. 29–32.
  8. Митта В.В., Шерстюков М.П. О находках остатков челюстного аппарата аммонитов в средней юре Карачаево-Черкесии // Современные проблемы изучения головоногих моллюсков. Морфология, систематика, эволюция, экология и биостратиграфия. М.: ПИН РАН, 2018. С. 80–83.
  9. Шиманский В.Н. О систематическом положении ринхолитов // Тр. Палеонтол. ин-та АН СССР. 1949. Т. 20. С. 199–208.
  10. Blainville M.H.D. de. Mémoire sur les Belemnites, considérées zoologiquement et géologiquement. P.: F.G. Levrault, 1827. 136 p.
  11. Engeser T., Keupp H. Phylogeny of the aptychi-possessing Neoammonoidea (Aptychophora nov., Cephalopoda) // Lethaia. 2002. V. 34. P. 79–96.
  12. Kanie Y. Cretaceous tetragonitid ammonite jaws: a comparison with modern Nautilus jaws // Trans. Proc. Palaeontol. Soc. Japan. N. ser. 1982. V. 25. P. 239–258.
  13. Landman N.H., Kennedy W.J., Cobban W.A. et al. A new species of Hoploscaphites (Ammonoidea: Ancyloceratina) from cold methane seeps in the Upper Cretaceous of the US Western Interior // Amer. Mus. Novit. 2013. № 3781. P. 1–39.
  14. Lehmann U., Tanabe K., Kanie Y., Fukuda Y. Über den Kieferapparat der Lytoceratacea (Ammonoidea) // Paläontol. Z. 1980. Bd 54. S. 319–329.
  15. Meek F.B., Hayden F.V. Palaeontology of the Upper Missouri Invertebrates. Pt I // Smithson. Contrib. to Knowledge. 1864. V. 172. P 118–121.
  16. Mironenko A., Gulyaev D. Middle Jurassic ammonoid jaws (anaptychi and rhynchaptychi) from Dagestan, North Caucasus, Russia // Palaeogeogr., Palaeoclimatol., Palaeoecol. 2018. V. 489. P. 117–128.
  17. Mironenko A.A., Jagt J.W.M., Jagt-Yazykova E.A. An unusual conchorhynch from the upper Maastrichtian of the southeast Netherlands and the distinction between nautiloid and ammonoid conchorhynchs (Mollusca, Cephalopoda) // Cret. Res. 2022. V. 130. Р. 105037.
  18. Mironenko A.A., Mitta V.V. The first record of jaws of Boreal Valanginian ammonites (Cephalopoda, Polyptychitidae) // Cret. Res. 2023. V. 142. Р. 105370.
  19. Mironenko A.A., Rogov M.A. Ammonoid lower jaws of rhynchaptychus type from the Cretaceous of Crimea // Cret. Res. 2018. V. 91. P. 350–361.
  20. 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.
  21. Mitta V.V., Schweigert G. A new morphotype of lower jaw associated with Calliphylloceras (Cephalopoda: Ammonoidea) from the Middle Jurassic of the northern Caucasus // Paläontol. Z. 2016. V. 90. № 2. P. 293–297.
  22. Mitta V.V., Schweigert G., Sherstyukov M.P., Dietze V. First finds of ammonite aptychi of Leioceras and Bredyia (Ammonoidea, Hildoceratoidea) in the Aalenian of Northern Caucasus, Russia // Paläontol. Z. 2018. V. 92. № 4. P. 605–615.
  23. Naugolnykh S.V., Mitta V.V. A discovery of the reproductive organ of bennettitalean affinity from the Middle Jurassic of Northern Caucasus, Russia // N. Jb. Geol. Paläontol. Abh. 2023. Bd 308. H. 1. P. 33–43.
  24. Naugolnykh S.V., Mitta V.V. A first record of possible caytonialean pteridosperms from the Upper Bajocian (Middle Jurassic) of Northern Caucasus, Russia // N. Jb. Geol. Paläontol. Abh. 2024. Bd 310. H. 2. P. 133–146.
  25. Owen R. Memoir on the Pearly Nautilus (Nautilus Pompilius, Linn.) with Illustrations of Its External Form and Internal Structure. L.: Direction Council, 1832. 122 p.
  26. Quenstedt F.A. Petrefactenkunde Deutschlands. 1. Abt. 1: Cephalopoden. Tübingen: Fues, 1849. S. 1–580.
  27. Riegraf W., Moosleitner G. Barremian rhyncholites (Lower Cretaceous Ammonoidea: calcified upper jaws) from the Serre de Bleyton (Departement Drome, SE France) // Ann. Naturhist. Mus. Wien. 2010. V. 112. P. 627–657.
  28. Saunders W.B., Spinosa C., Teichert C., Banks R.C. The jaw apparatus of recent Nautilus and its palaeontological implications // Palaeontology. 1978. V. 21. P. 129–141.
  29. Tanabe K., Fukuda Y., Kanie Y., Lehmann U. Rhyncholites and conchorhynchs as calcified jaw elements in some Late Cretaceous ammonites // Lethaia. 1980. V. 13. P. 157–168.
  30. Tanabe K., Kruta I., Landman N.H. Ammonoid buccal mass and jaw apparatus // Ammonoid Paleobiology: from Anatomy to Ecology / Eds: Klug C., Korn D., De Baets K. et al. Dordrecht: Springer, 2015. P. 439–494 (Topics in Geobiology. V. 43).
  31. Tanabe K., Landman N.H. Morphological diversity of the jaws of Cretaceous Ammonoidea // Abh. Geol. Bundesanst. Wien. 2002. V. 57. P. 157–165.
  32. Tanabe K., Shigeta Y. Lower jaws of two species of Menuites (Pachydiscidae, Ammonoidea) from the middle Campanian (Upper Cretaceous) in the Soya area, northern Hokkaido, Japan // Bull. Nat. Mus. Natur. Sci. 2019. V. 45. P. 19–27.
  33. Till A. Die Cephalopodengebisse aus dem schlesischen Neokom // Jb. Kais.-konigl. Geol. Reichsanst. 1906. Bd 56. H. 1. S. 89–154.
  34. Till A. Die fossilen Cephalopodengebisse. // Jb. Kais.-konigl. Geol. Reichsanst. 1907. Bd 57. H. 3. S. 535–682.
  35. Till A. Über einige neue Rhyncholithen // Verhandl. Kais.-konigl. Geol. Reichsanst. 1911. № 16. S. 360–365.
  36. Trauth F. Aptychenstudien. I. Über die Aptychen im Allgemeinen // Ann. Naturhist. Mus. Wien. 1927. Bd 41. S. 171–259.

Supplementary files

Supplementary Files
Action
1. JATS XML
Download
2. Fig. 1. Location of the location: a – the general scheme, the frame shows the outline of a detailed map; b – a detailed map, indicating the location of 17.

Download (64KB)
Indexing metadata
3. Fig. 2. The right bank of the Kyafar River below art. Storozhevaya, part of location 17; the arrow shows the excavation from the extracted siltstone nodule with the find described in the work.

Download (116KB)
Indexing metadata
4. Fig. 3. Section of the Strenoceras niortense zone on the right bank of the Kafar River (location 17) (according to: Mitta, 2021) and the level of discovery of the described jaw.

Download (53KB)
Indexing metadata
5. Fig. 4. Lytoceras maxilla (Thysanolytoceras) sp., ex. Very, No. 5546/404: a – from above, b – from the side, c – the front part is larger; Karachay-Cherkessia, Zelenchuksky District, S. Berit Ave. Kyafar S. voloske. Storozhevaya, location No. 17; upper Bajocian, Strenoceras niortense zone, baculatum Baculatoceras subzone, baculatum faunal horizons. Notation: R – whether of a different scale ruler. m. 10.

Download (133KB)
Indexing metadata
6. 5. EDX spectra of various parts of the jaw of Lytoceras (Thysanolytoceras) sp.: a – pyriticized area in the middle of the jaw, b – phosphatized main part of the jaw, c – calcitic rhincholite, d – carbonated areas in the grooves on the sides of the central part of the jaw.

Download (37KB)
Indexing metadata

Copyright (c) 2024 Russian Academy of Sciences