Middle Jurassic (Upper Bathonian and Lower Callovian) jaws of Kosmoceratid ammonites of Central Russia


Elements of the jaw apparatuses of the ammonite genus Kepplerites (Ammonoidea: Stephanoceratoidea, Kosmoceratidae, Keppleritinae) are described from two Upper Bathonian and one Lower Callovian localities of the Russian Platform. The lower jaws (aptychi), based on their size and shape can be assigned to two groups and certainly belonged to the co-occurring macroconchs K. (Kepplerites) and theirs microconchs K. (Toricellites). It is established that the presence or absence of tuberculate ornamentation on the surface calcite layer in the studied kosmoceratid aptychi (and accordingly the assignment of the aptychi of kosmoceratids to Granulaptychus-type or Praestriaptychus-type) is a result of burial and fossilization in different settings. Most likely all Kosmoceratidae had lower jaws of the Granulaptychus-type, apparently like the related subfamily Garantianinae (family Stephanoceratidae). For the first time, upper jaws of cephalopods supposedly also belonging to the ammonites of genus Kepplerites are described from the Bathonian Stage.

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  1. Arkell, W.J. 1957. Aptychi. In Treatise on Invertebrate Paleontology. Pt. L. Mollusca, ed. R.C. Moore, L437–L441. New York, N.Y.: Geological Society of America and Lawrence, Kans.: University of Kansas Press.

  2. Dietl, G. 1983. Die Ammonitengattung Strenoceras aus dem südwestdeutschen Subfurcaten-Oolith (Bajocium), Mittl. Jura. Stuttgarter Beiträge zur Naturkunde (Ser. B) 90: 1–37.

  3. Doguzhaeva, L.A., and I.A. Mikhailova. 2002. The jaw apparatus of the heteromorphic ammonite Australiceras whitehouse, 1926 (Mollusca: Cephalopoda) from the Aptian of the Volga region. Doklady Biological Sciences 382: 38–40.

    Article  Google Scholar 

  4. Engeser, T., and H. Keupp. 2002. Phylogeny of the aptychi-possessing Neoammonoidea (Aptychophora nov., Cephalopoda). Lethaia 34: 79–96. https://doi.org/10.1111/j.1502-3931.2002.tb00070.x.

    Article  Google Scholar 

  5. Fischer, A.G., and R.O. Fay. 1953. A spiny aptychus from the Cretaceous of Kansas. Kansas Geological Survey Bulletin 102: 77–92.

    Google Scholar 

  6. Gulyaev, D.B. 2001. Infrazonal ammonite scale for the Upper Bathonian-Lower Callovian of Central Russia. Stratigraphy and Geological Correlation 9(1): 65–92.

    Google Scholar 

  7. Howarth, M.K. 2017. Systematic descriptions of the Stephanoceratoidea and Spiroceratoidea. In Treatise online 84, Pt L, revised, vol. 3B, chapt. 6, 1–101. Lawrence, Kans.: University of Kansas. https://doi.org/10.17161/to.v0i0.6521

  8. Keupp, H., R. Hoffmann, K. Stevens, and R. Albersdörfer. 2016. Key innovations in Mesozoic ammonoids: the multicuspidate radula and the calcified aptychus. Palaeontology 59(6): 775–791. https://doi.org/10.1111/pala.12254.

    Article  Google Scholar 

  9. Keupp, H., and V. Mitta. 2013. Cephalopod jaws from the Middle Jurassic of central Russia. Neues Jahrbuch für Geologie und Paläontologie, Abhandlungen 270(1): 23–54. https://doi.org/10.1127/0077-7749/2013/0356

  10. Kiselev, D.N., and M.A. Rogov. 2011. Ammonite succession of the Bathonian-Callovian boundary beds of the Middle Volga region. In Jurassic system of Russia: problems of stratigraphy and paleogeography, 102–120. Yaroslavl: Yaroslavl State Pedagogical University. (in Russian).

  11. Kruta, I., N. Landman, I. Rouget, F. Cecca, and P. Tafforeau. 2011. The role of ammonites in the Mesozoic marine food web revealed by jaw preservation. Science 331(6013): 70–72. https://doi.org/10.1126/science.1198793.

    Article  Google Scholar 

  12. Kruta, I., I. Rouget, N.H. Landman, K. Tanabe, and F. Cecca. 2009. Aptychi microstructure in Late Cretaceous Ancyloceratina (Ammonoidea). Lethaia 42(3): 312–321. https://doi.org/10.1111/j.1502-3931.2009.00154.x

  13. Mironenko, A.A. 2018. Microstructure of aptychi of Upper Jurassic (Upper Oxfordian) ammonites from Central Russia. Lethaia 51: 75–85. https://doi.org/10.1111/let.12223.

    Article  Google Scholar 

  14. Mironenko, A.A. 2014. Discovery of the jaw apparatus of the upper Volgian ammonite Kachpurites fulgens (Craspeditidae). Paleontological Journal 48(6): 580–586. https://doi.org/10.1134/S0031030114060100

  15. Mitta, V.V. 2000. Ammonites and biostratigraphy of the Lower Callovian of Russian Platform. Byulleten’ kollekcionnogo fonda VNIGNI 3: 1–144. (in Russian).

    Google Scholar 

  16. Mitta, V.V. 2005. Late Bathonian Cardioceratidae (Ammonoidea) from the Middle Reaches of the Volga River. Paleontological Journal 39(5): S629–S644.

    Google Scholar 

  17. Mitta, V.V. 2008. The genus Kepplerites Neumayr et Uhlig (Kosmoceratidae, Ammonoidea) in the Bathonian-Callovian beds (Middle Jurassic) of the Russian platform. Paleontological Journal 42(1): 5–14. https://doi.org/10.1134/S0031030108010024.

    Article  Google Scholar 

  18. Mitta, V.V., G. Dietl, J.H. Callomon, G. Schweigert, and V. Dietze. 2015. The ammonite genus Cadoceras (Cardioceratidae) in the Lower Callovian of the Swabian Alb (Southern Germany). Neues Jahrbuch für Geologie und Paläontologie, Abhandlungen 278(3): 303–321. https://doi.org/10.1127/njgpa/2015/0531.

    Article  Google Scholar 

  19. Mitta, V.V. 1999. The genus Cadochamoussetia in the phylogeny of the Jurassic Cardioceratidae (Ammonoidea). In Advancing research on living and fossil cephalopods, eds. F. Oloriz and F.J. Rodriguez-Tovar, 125–136. New York: Plenum Press.

    Google Scholar 

  20. Mitta, V.V., G. Schweigert, M.P. Sherstyukov, and V. Dietze. 2018. First find of aptychi of Leioceras and Bredyia (Ammonoidea, Hildoceratoidea) in the Aalenian of Northern Caucasus, Russia. PalZ. Paläontologische Zeitschrift 92(4): 605–615. https://doi.org/10.1007/s12542-018-0416-6.

    Article  Google Scholar 

  21. Mitta, V.V. 2004. On the evolution of ammonites and stratigraphy of the Bathonian / Callovian boundary beds in the basin of the Volga. In Ecosystem restructures and the evolution of biosphere 6, 125–136. Moscow: Palaeontological Institute, RAN. (in Russian).

  22. Mitta, V.V. 2009. On the discovery of aptychi in the Upper Bathonian of the Russian platform. In Contributions to Current Cephalopod Research: Morphology, Systematic, Evolution, Ecology and Biostratigraphy, 66–68. Moscow: Paleontological Institute. (in Russian).

  23. Mitta, V.V. 2014. On the Upper Bathonian biostratigraphy of the Russian platform. In Problems of paleoecology and historical geoecology, 91–100. Saratov: Saratov State Technical University. (in Russian).

  24. Mitta, V.V. 2017. The genus Keppleritiana gen. nov. (Stephanoceratidae, Ammonoidea) from the Upper Bajocian of the Northern Caucasus. Paleontological Journal 51(3): 247–257. https://doi.org/10.7868/S0031031X17030060

  25. Mitta, V.V., A.S. Alekseev, and S.M. Shik, eds. 2012. Unified regional stratigraphic scheme of the Jurassic of East European Platform and Explanatory note. Moscow: PIN RAS – VNIGNI. (in Russian).

  26. Mitta, V.V., and H. Keupp. 2004. Ammoniten-Kiefer aus dem Callovium Russlands. Mitteilungen aus dem Geologisch Paläontolo-gischen Institut der Universität Hamburg 88: 125–134.

  27. Mönnig, E. and G. Dietl. 2017. The systematics of the ammonite genus Kepplerites (upper Bathonian and basal Callovian, Middle Jurassic) and the proposed basal boundary stratotype (GSSP) of the Callovian Stage. Neues Jahrbuch für Geologie und Paläontologie, Abhandlungen 286(3): 235–287. https://doi.org/10.1127/njgpa/2017/0697

  28. Nikitin, S. 1884. Die Cephalopodenfauna der Jurabildungen des Gouvernements Kostroma. Verhandlungen der russisch-kaiserlichen mineralogischen Gesellschaft zu St.-Petersburg (2. Serie) 20: 13–88.

  29. Parent, H., and G.E.G. Westermann. 2016. Jurassic ammonite aptychi: functions and evolutionary implications. Swiss Journal of Palaeontology 135(1): 101–108. https://doi.org/10.1007/s13358-015-0102-1.

    Article  Google Scholar 

  30. Parent, H., G.E.G. Westermann, and J.A. Chamberlain Jr. 2014. Ammonite aptychi: functions and role in propulsion. Geobios 47(1–2): 45–55. https://doi.org/10.1016/j.geobios.2013.12.001.

    Article  Google Scholar 

  31. Quenstedt, F.A. (1856–1858). Der Jura, 1–842. Tübingen: Laupp.

  32. Rogov, M.A. 2004. Middle and late Callovian aptychi (Ammonoidea) of the Russian Plate. Paleontological Journal 38(1): 27–34.

    Google Scholar 

  33. Rogov, M.A., and A.A. Mironenko. 2016. Patterns of the evolution of aptychi of Middle Jurassic to Early Cretaceous Boreal ammonites. Swiss Journal of Palaeontology 135(1): 139–151. https://doi.org/10.1007/s13358-015-0110-1.

    Article  Google Scholar 

  34. Schweigert, G. 2000. On the Aptychus belonging to the Middle Jurassic ammonite genus Kosmoceras. Neues Jahrbuch für Geologie und Paläontologie, Monatshefte 2000(11): 698–704.

    Article  Google Scholar 

  35. Schweigert, G. 1998. Die Ammonitenfauna des Nusplinger Plattenkalks (Ober-Kimmeridgium, Beckeri-Zone, Ulmense-Subzone, Baden-Württemberg). Stuttgarter Beiträge zur Naturkunde (Serie B: Geologie und Paläontologie) 267: 1–61.

  36. Steinmann, G., and L. Döderlein. 1890. Elemente der Paläontologie, 1–848. Leipzig: W. Engelmann.

    Google Scholar 

  37. Tanabe, K. 1983. The jaw apparatuses of Cretaceous desmoceratid ammonites. Palaeontology 26: 677–686.

    Google Scholar 

  38. Tanabe, K., I. Kruta, and N.H. Landman 2015. Ammonoid buccal mass and jaw apparatus. In Ammonoid paleobiology: from anatomy to ecology, eds. C. Klug, D. Korn, K. De Baets, I. Kruta, and R.H. Mapes, 429–484. Dordrecht: Springer. https://doi.org/10.1007/978-94-017-9630-9_10

  39. Trauth, F. 1927. Aptychenstudien. I. Über die Aptychen im Allgemeinen. Annalen des Naturhistorischen Museums in Wien 41: 171–259.

    Google Scholar 

  40. Trauth, F. 1930. Aptychenstudien. V. Die Aptychen des Dogger. Annalen des Naturhistorischen Museums in Wien 44: 329–411.

    Google Scholar 

  41. Trauth, F. 1937. Die Praestriaptychi und Granulaptychi des Oberjura und der Unterkreide. Paläontologische Zeitschrift 19(1–2): 134–162.

    Article  Google Scholar 

  42. Westermann, G.E.G. 1954. Monographie der Otoitidae (Ammonoidea): Otoites, Trilobiticeras, Itinsaites, Epalxites, Germanites, Masckeites (Pseudotoites, Polyplectites), Normannites. Beihefte zum Geologischen Jahrbuch 15: 1–364.

    Google Scholar 

  43. Wetzel, W. 1954. Die Bielefelder Garantianen: Geschichte einer Ammonitengattung. Geologisches Jahrbuch 68: 547–586.

    Google Scholar 

  44. Wippich, M.G. 2005. Ammonoideen-Kiefer (Mollusca, Cephalopoda) aus Schwarzschiefern des Cenoman/Turon-Grenzbereichs (Oberkreide) im nördlichen Westfalen. Geologie und Paläontologie in Westfalen 65: 77–93.

    Google Scholar 

  45. Ziegler, B. 1974. Uber den Ammonites aporus Oppel. Stuttgarter Beitrage zur Naturkunde – Serie B (Geologie und Palaontologie) 9:1–6

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M. A. Rogov (Geological Institute, Russian Academy of Sciences) provided the aptychi, found by him in the locality Alatyr II for this study. Scanning electron microscope images were made with the assistance of R. A. Rakitov (Paleontological Institute, Russian Academy of Sciences). This work was supported in part by under the Russian Foundation of Basic Research Grant No. 18-05-01070 awarded to A. A. Mironenko. The authors are sincerely grateful to everyone who assisted in this work. Finally, our cordial thanks go to the journal’s referees Isabelle Kruta (Museum National d'Histoire Naturelle, Paris) and Horacio Parent (University of Rosario, Argentina) as well as the responsible editors Simon Schneider (Cambridge, UK) and Mike Reich (SNSB-BSPG Munich, Germany).

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Correspondence to Vasily V. Mitta.

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Handling Editor: Simon Schneider.

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Mitta, V.V., Mironenko, A.A. Middle Jurassic (Upper Bathonian and Lower Callovian) jaws of Kosmoceratid ammonites of Central Russia. PalZ 95, 61–69 (2021). https://doi.org/10.1007/s12542-020-00533-8

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  • Ammonites
  • Cephalopod jaws
  • Aptychi
  • Granulaptychi
  • Kepplerites
  • Bathonian
  • Callovian
  • Central Russia