Macroscaphitidae
Temporal range: Lower Barremian – Lower Cenomanian
Specimen of Macroscaphites yuani Meek 1876, from the Aptian (Early Cretaceous), Malenowit, Friedek, Schlesien.[1]
Scientific classification
Kingdom:
Animalia
Phylum:
Mollusca
Class:
Cephalopoda
Subclass:
†Ammonoidea
Superfamily:
†Ptychoceratoidea
Family:
†Macroscaphitidae

Hyatt, 1900
Type genus
†Macroscaphites (Macroscaphites)
Meek, 1876
Subgenera
  • †Macroscaphites (Macroscaphites) Meek, 1876
  • †Macroscaphites (Costidiscus) Uhlig, 1883

Macroscaphitidae[2] (Greek μακρός, long and σκάφος, boat) is an extinct family of ptychoceratoid cephalopods from the subclass Ammonoidea that lived from the Lower Barremian to the Lower Cenomanian stages of the Cretaceous. Fossils of Macroscaphitidae were found all around the world although the abundance of found fossils is rather limited. Known fossils from collections were found largely in Europe (e.g. Italy, France, Czech Republic), South America (Mexico, Venezuela) and Africa (e.g. Mozambique).[3] It is known for some species of which complete specimens were found that these animals developed a hetermorphic shell, i.e. the coiling of the shell was not regular, such that the first whirls formed a planispirally coiled evolute section as seen in homomorphic ammonites, but had an additional straight middle part and a presumably upwards facing aperture. Due to their odd morphology the taxonomic classification of Macroscaphitidae changed often over time since their discovery and may not be finally settled even now.

Classification

The Macroscaphitidae comprise a family in the subclass of Ammonoidea in the class of Cephalopoda in the phylum Mollusca. Due to their curious morphology multiple attempts to classify them into a superfamily were made. While the Macroscaphitidae were at first assigned to Hamitaceae in the 1950s,[4] this was revised in 2000 when they were classified as belonging to the superfamily Ancyloceratoidea.[5] However, in 2007 it was proposed to assign Macroscaphitidae to the superfamily Ptychoceratiodea,[6] where Macroscaphitidae still belong today.

Phylogeny of Ammonitida with emphasis on Macroscaphitidae (own figure based on a dataset by Raia et al. (2015)[7] and created with the R paleotree package[8])

Taxa

The family includes merely one genus (Macroscaphites Meek 1876) with two subgenera, the nominative (or type) genus Macroscaphites (Macroscaphites) Meek 1876 and the other subgenus Macroscaphites (Costidscus) Uhlig 1883.[9] Some sources suggest more genera, such as Acantholytoceras Spath 1932, Ivaldiceras Delanoy 2010 or Rugacrioceras Vermeulen 2007, but the viability of such claims remains questionable.[10] The type genus Macroscaphites (Macroscaphites) Meek 1876 contains four species, whereof Macroscaphites yuani Puzos 1831 constitutes the type species. The subgenus Macroscaphites (Costidiscus) Uhlig 1883 solely contains one species, Macroscaphites (Costidscus) reticostatus d’Orbigny 1840.

Fm. †Macroscaphitidae Hyatt 1900

G. †Macroscaphites Meek 1876
Subg. †Macroscaphites (Costidiscus) Uhlig 1883
†Macroscaphites (Costidiscus) recticostatus d'Orbigny 1840
Subg. †Macroscaphites (Macroscaphites) Meek 1876
†Macroscaphites perforatus Avram 1984
†Macroscaphites soaresi Da Silva 1962
†Macroscaphites striatisulcatus d'Orbigny 1841
†Macroscaphites yuani Puzos 1831

Morphology

Costidiscus recticostatus (d'Orbigny, 1840)[11]

Due to the scarce amount of fossils found of members of Macroscaphitidae, final remarks about their morphology are difficult to infer. Additionally, just few fossils have been preserved entirely. Nevertheless, a couple of specimens suggest that a wide range of sizes, up to tens of centimeters (e.g. Macroscaphites yuani, see picture at the top). While the general anatomy of members of Macroscaphitidae is supposed to largely follow the one of homomorphic ammonites (i.e. aragonitic shell, supposedly complex suture lines etc.) much remains yet unknown, due to the small number of specimens. However, some complete specimens infer that the shells of Macroscaphites can be more or less divided into three parts: the planispirally coiled phragmocone (as in homomorphic ammonites), a straight part of the living chamber and a hook with an almnost 180 degree bend at the end where the aperture is located. Apart from that little is known about further morphological features.

Life and ecology

It is likely that Macroscaphites lived similar to other, better known, heteromorphic ammonites. One assumption is that the whole living chamber was filled with the softbody to deduce the center of mass and buoyancy of the ammonite.[12] This commonly used model suggests for hetermorphic ammonites that the center of mass lies vertically below the center of buoyancy (to keep the animal stable in the water column) and thus predicts that the aperture of Macroscaphites was probably facing upwards.[13] In addition to that it has been proposed for other heteromorphic ammonites that there was a second stable position with the aperture tilted toward the sea floor to prey on bottom dwellers. However, this remains controversial for Macroscaphitidae since e.g. specimens of Macroscaphites yuani suggest an aperture facing towards the phragmocone, a so-called ancyclocone, and thus preventing it from being tilted towards the sea floor.[14] Thus the exact feeding behavior of Macroscaphites remains unknown. While it is proposed that members of Macroscaphitidae were fast-moving nektonic carnivores due to there hydrodynamic anatomy, studies of other heteromorphic ammonites suggest a rather nektobenthonic lifestyle.[15][16] Foraminifera, crustaceans and ostracods found in the guts of some species provide evidence that some heteromorphic ammonites fed on benthic animals,[17] making a epifaunal lifestyle rather likely. Furthermore, all heteromorphic ammonite lack the hyponomic sinus e.g. found in recent Nautilius that is used for manoeuvreable jetting, thus making a comparable lifestyle to Nautilus unlikely. In addition most fossil remnants of heteromorphic ammonites, including those of the Macroscaphitidae, were found in clay or marl rather than sandy facies suggesting a substrate dependend lifestyle.[18] It was thus concluded that probably most heteromorphic ammonites, including Macroscaphitidae were bottom dwelling, like a small octopus with a mobile burrow.[19]

Fossils and distribution

Fossil distribution of Macroscaphitidae

Compared to other ammonoid families just very few fossil specimens of Macroscaphitidae are known from collections. While some specimens are well preserved and provide information about the morphology and potentially about the way of living of Macroscaphites, others are merely partly preserved making a comprehensive analysis of the morphology difficult. Fossils of members of Macroscaphitidae have been found in Europe (France,[20] Italy,[21] Serbia, Bulgaria,[22] the Czech Republic,[23] Spain,[24] Georgia[25]), Africa (Egypt,[26] South Africa[27] and Mozambique[27]) and South America (Mexico[28] and Venezuela[29]). The fossils have been found in the form of casts, molds, impressions and replacement[30][31][32] and occurred mainly in limestone[33]

See also

References

  1. ↑ Gall, Larry (2022). "Invertebrate Paleontology Division, Yale Peabody Museum". Yale University Peabody Museum. doi:10.15468/nqheui. {{cite journal}}: Cite journal requires |journal= (help)
  2. ↑ "Macroscaphitidae". GBIF Backbone Taxonomy (Checklist dataset). GBIF. doi:10.15468/39omei. Retrieved 2022-04-30.
  3. ↑ "Macroscaphitidae in The Paleobiology Database". Global Biodiversity Information Facility (database query result). 2022.
  4. ↑ Wright, C. W. (1952). A classification of the Cretaceous ammonites. Journal of Paleontology, 213-222.
  5. ↑ G. Landra, F. Cecca, and Z. Vasicek. 2000. Early Aptian ammonites from the top of the Maiolica and the anoxic "Selli level" (Lombardy, Southern Alps). Bollettino della Societa Paleontologica Italiana 39(1):29-45
  6. ↑ J. Klein, R. Busnardo, M. Company, G. Delanoy, M. Kakbadze, S. Reboulet, P. Ropol, Z. Vasicek, and J. Vermeulen. 2007. Fossilium Catalogus. I: Animalia. Pars 144: Lower Cretaceous Ammonites III. Bochianitoidea, Protancyloceratoidea, Ancyloceratoidea, Ptychoceratoidea 1-381
  7. ↑ Raia, P., Passaro, F., Carotenuto, F., Maiorino, L., Piras, P., Teresi, L., ... & Fortelius, M. 2015. Cope’s rule and the universal scaling law of ornament complexity. The American Naturalist, 186(2), 165-175.
  8. ↑ Bapst, David W. (2012). paleotree: an R package for paleontological and phylogenetic analyses of evolution. Methods Ecol. Evol. 3:803-807.
  9. ↑ "Macroscaphitidae". Paleobiology Database. Retrieved 2022-09-13.
  10. ↑ Bagni Liggia (ed.). "Family: Macroscaphitidae". Worldwide Mollusc Species Database. Retrieved 2022-02-10.
  11. ↑ Chagnoux S (2023). "The fossil collection (F) of the Muséum national d'Histoire naturelle (MNHN – Paris)". doi:10.15468/fjjmkb. {{cite journal}}: Cite journal requires |journal= (help)
  12. ↑ Trueman A. E. 1941. The ammonite body-chamber, with special reference to the buoyancy and mode of life of the living ammonite. Quarterly Journal of the Geological Society of London, 384: 339-383.
  13. ↑ Kakabadzé M. V, and Sharikadzé M. Z. 1993. On the mode of life of heteromorph ammonites heterocone, ancyclocone, ptychocone), p. 209-215. In S. Elmi, C. Mangold and Y. Almeras (eds.), 3-eme Symposium international sur le Cephalopodes actuels et fossiles. Geobios Memoire Special 15.
  14. ↑ Monks, N., & Young, J. R. (1998). Body position and the functional morphology of Cretaceous heteromorph ammonites. Palaeontologia Electronica, 1(1), 15.
  15. ↑ Ebel K. 1992. Mode of life and soft body shape of heteromorph ammonites. Lethaia, 25: 179-193.
  16. ↑ Klinger, H. C. 1980. Speculations on Buoyancy Control and Ecology in some Heteromorph Ammonites, p. 337-355. In House, M. R. and Senior, J. R. (eds.), The Ammonoidea. Systematics Association Special Volume 18. Academic Press, London, UK.
  17. ↑ Lehmann U. & Weitschat W, 1973. Zur Anatomie und Okologie von Ammoniten: Funde von Kropf und Kiemen. Paläontologische Zeitschrift, 47: 69-76.
  18. ↑ Marcinowski R. & Wiedmann J. 1990. The Albian ammonites of Poland. Palaeontologica Polonica, 50: 1-94.
  19. ↑ Monks, Neale and Young, Jeremy R. 1998. Body position and the functional morphology of Cretaceous Heteromorph ammonites, Palaeontologia Electronica Vol. 1, Issue 1; 1A; 15p. https://doi.org/10.26879/98001 palaeo-electronica.org/content/1-1-hetemorph-ammonites
  20. ↑ A. Kroh, A. Lukeneder, and G. Moosleitner. 2010. The invertebrate fauna from the Barremian of Serre de Bleyton (Drôme, SE France). Annalen des Naturhistorischen Museums in Wien, Serie A 112:569-574
  21. ↑ F. Cecca, G. Pallini, E. Erba, I. Permoli-Silva, and R. Coccioni. 1994. Hauterivian-Barremian chronostratigraphy based on ammonites, nannofossils, planktonic foraminifera and magnetic chrons from the Mediterranean domain. Cretaceous Research 15:457-467
  22. ↑ J. R. Manolov. 1962. New ammonites from the Barremian of north Bulgaria. Palaeontology 5:527-539
  23. ↑ J. Michalik and Z. Vasicek. 1989. Lower Cretaceous Stratigraphy and Paleogeography of the Czechoslovakian Western Carpathians. In J. Wiedmann (ed.), Cretaceous of the Western Tethys. Proceedings 3rd International Cretaceous Symposium, Tuebingen 1987:505-523
  24. ↑ M. Company, J. Sandoval, and J. M. Tavera. 1995. Lower Barremian ammonite biostratigraphy in the Subbetic Domain (Betic Cordillera, southern Spain). Cretaceous Research 16(2-3):243-256
  25. ↑ E. V. Kotetishvili. 1989. Biofacies Characteristics of Lower Cretaceous Deposits of Georgia. In J. Wiedmann (ed.), Cretaceous of the Western Tethys. Proceedings 3rd International Cretaceous Symposium, Tuebingen 1987:543-550
  26. ↑ H. Douvillé. 1916. Les terrains secondaires dans le massif du Moghara à l’Est de l’isthme de Suez. Mémoire de l’Académie des Sciences, Paris 54(2):1-184
  27. 1 2 W. J. Kennedy, H. C. Klinger, and M. V. Kakabadze. 2009. Macroscaphites Meek, 1876, a heteromorph ammonite from the Lower Aptian of southern Mozambique and northern KwaZulu-Natal. African Natural History 5:37-41
  28. ↑ R. Barragán, J. A. Moreno-Bedmar, F. Núñez-Useche, L. F. Álvarez-Sánchez, and G. Delanoy. 2021. Ammonite biostratigraphy of two stratigraphic sections of the La Peña Formation (Aptian, Lower Cretaceous) in Nuevo León State, northeast Mexico. Cretaceous Research 125(104862)
  29. ↑ O. Renz. 1982. The Cretaceous ammonites of Venezuela 1-132
  30. ↑ E. Böse. 1923. Algunas faunas cretácias de Zacatecas, Durango y Guerrero. Boletín del Instituto Géologica de México 42:1-219
  31. ↑ Z. Vasicek, D. Rabrenovic, V. J. Radulovic, B. V. Radulovic, and I. Mojsic. 2013. Ammonoids (Desmoceratoidea and Silesitoidea) from the Late Barremian of Boljetin, eastern Serbia. Cretaceous Research 41:39-54
  32. ↑ Z. Vasicek, D. Rabrenovic, P. Skupien, V. J. Radulovic, B. V. Radulovic and I. Mojsic. 2014. Ammonites (Phylloceratina, Lytoceratina and Ancyloceratina) and organic-walled dinoflagellate cysts from the Late Barremian in Boljetin, eastern Serbia. Cretaceous Research 47:140-159
  33. ↑ G. Delanoy, J. A. Moreno-Bedmar, J.J. Ruiz and D. Tolós Lládser. 2013. Xerticeras gen. nov., a new genus of micromorphic heteromorph ammonite (Ancyloceratina, Ancyloceratidae)from the lower Aptian of Spain. Carnets de Géologie [Notebooks on Geology] CG2013_A02:89-103
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