Late late Albian (Early Cretaceous) shark teeth from Annopol, Poland

Siversson, Mikael; Machalski, Marcin

doi:10.1080/03115518.2017.1282981

Cited by 16 publications

(15 citation statements)

References 44 publications

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“…Genus-level taxonomy was recently commented upon by Siversson and Machalski (2017, p. 453, 454) and Shimada and Everhart (2019). The types of the first two described species of Cretodus — Cretodus semiplicatus (Münster in Agassiz, 1843) from the Turonian of Germany and Cretodus crassidens from the Turonian of the UK—are each based on isolated and poorly preserved teeth (Shimada and Everhart, 2019).…”

Section: Discussionmentioning

confidence: 99%

“…The types of the first two described species of Cretodus — Cretodus semiplicatus (Münster in Agassiz, 1843) from the Turonian of Germany and Cretodus crassidens from the Turonian of the UK—are each based on isolated and poorly preserved teeth (Shimada and Everhart, 2019). The syntypes of Cretodus semiplicatus are considered marginally diagnostic for their poor preservation state and position (lateroposterior tooth, generally conservative in morphology among lamniforms and thus less taxonomically informative; Siversson and Machalski, 2017; Shimada and Everhart, 2019). Furthermore, being almost coeval, they could be conspecific with the type specimen of Cretodus crassidens (see Siversson and Machalski, 2017).…”

Section: Discussionmentioning

confidence: 99%

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Morphology and paleobiology of the Late Cretaceous large-sized sharkCretodus crassidens(Dixon, 1850) (Neoselachii; Lamniformes)

et al. 2022

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The definition of the Cretaceous shark genus Cretodus Sokolov, 1965 is primarily based on isolated teeth. This genus includes five species. Among these, Cretodus houghtonorum Shimada and Everhart, 2019 is the only species based on a partially preserved skeleton. Here, the taxonomic attribution of a virtually complete skeleton of Cretodus from the Turonian of northeastern Italy is discussed, together with a few specimens from the Turonian of England. One of the latter is investigated through micropaleontological analysis to determine its stratigraphic position. The material is referred to Cretodus crassidens (Dixon, 1850), the diagnosis of which is emended herein. The dentition is tentatively reconstructed, exhibiting strong similarities with congeneric species, although it differs in having strong vertical folds on the main cusp labial face, a mesiodistally broad tooth aspect, weak and well-spaced ‘costulae’ at crown base, and a different dental formula in the number of parasymphyseal and lateral rows. Some tooth malformations are interpreted as feeding-related or senile characters. The Italian specimen suggests that Cretodus crassidens had a wide and laterally expanded mouth and head, a stout body, and attained a gigantic size. Cretodus crassidens was a moderate-speed swimming shark ecologically like the extant tiger shark Galeocerdo cuvier (Péron and Lesueur in Lesueur, 1822). The age estimate from vertebral-band counting suggests that the Italian individual was at least 23 years old and the growth model indicates a longevity of 64 years and a maximum attainable total length of 9–11 m. Cretodus crassidens occurs both in Boreal and Tethyan domains, implying a broad paleobiogeographic distribution and a preference toward offshore settings.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Morphology and paleobiology of the Late Cretaceous large-sized sharkCretodus crassidens(Dixon, 1850) (Neoselachii; Lamniformes)

et al. 2022

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“…The exceptional richness in fossil vertebrates (Ichthyosauria, Plesiosauria and Chondrichthyes) of the documented site compared to other known Albian sites (Amédro, 2008;Bardet et al, 2014;Siversson and Machalski, 2017) could bring invaluable ecological constraints on the evolutionary history of two major groups of marine reptiles (Ichthyosauria and Plesiosauria). Marine strata of Albian age have yielded numerous marine reptile specimens worldwide.…”

Section: The Albian-cenomanian Fossil Record Of Ichthyosauria and Plementioning

confidence: 91%

Paleoenvironmental context and significance of a partial elasmosaurid skeleton from the Albian of Haute-Provence, France

Vincent¹,

Grosjean

Bert

et al. 2020

Cretaceous Research

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The Early-Late Cretaceous transition (late Albian-early Cenomanian; ~100 Ma) witnessed marked environmental changes and a deep reorganization of the marine fauna. The impact of these environmental and biotic changes on Tethyan marine vertebrates is poorly understood, due to a fragmentary fossil record. Here we report upper Albian marine vertebrate remains, including a partially articulated plesiosaurian skeleton, from a fossiliferous glauconite-rich bed in the Alpes de Haute-Provence, France. The fossiliferous horizon produced a diversified invertebrate fauna including ammonoids and belemnoids. The ammonite fauna is abundant and diversified, indicating the Mortoniceras fallax ammonite Zone. The calcareous nannofossil biomarkers date the bed to the NC10a Zone. The fossiliferous bed consists of glauconitic marls enriched in planktic foraminifera and occurs amongst a monotonous succession of alternating marlstones and limestone beds. The vertebrate fauna consists of chondrichthyans and marine reptiles. Chondrichthyans are represented by five Lamniformes species (dominated by Sphenodus) and comprise predator taxa probably living in open marine temperate waters. The site yielded a large, partial post-cranial plesiosaurian skeleton with articulated elements belonging to an elasmosaurid and representing one of the most complete Albian plesiosaurian specimens known from Europe. The abundance and preservation of the collected fossil remains are best explained by their concentration during a basin-scale episode of very low sedimentation corresponding to a major episode of marine transgression, associated with a lower oxygenation of bottom waters. These findings indicate that the newly discovered fossiliferous bed holds promising clues about the evolutionary history of major groups of marine vertebrates and ammonites near the Early-Late Cretaceous transition.

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“…The vertebrate assemblages from Annopol comprise remains of bony fish, sharks and rays (Siversson and Machalski 2017;Newbrey, Machalski, Siversson and Martin-Abad unpublished), chimaeroids (Popov and Machalski 2014), protostegid turtles (Kapuścińska and Machalski 2015, platypterygiine and ophthalmosaurine ichthyosaurs , pliosaurid and elasmosaurid plesiosaurs , as well as extremely rare and fragmentary remains of pterosaurs (ornithocheiroids and/or azhdarchoids; see Machalski and Martill 2013). Most of these fossils have been collected from unit 3 at the top of the Albian.…”

Section: General Backgroundmentioning

confidence: 99%

“…This material originates from the upper Albian-middle Cenomanian part of the Cretaceous sedimentary succession exposed at Annopol, central Poland. This contribution is an addition to a series of papers on the Cretaceous biota from Annopol, resulting from recent exploration of this important Polish "Fossil-Lagerstätte" (Machalski and Kennedy 2013;Machalski and Martill 2013;Popov and Machalski 2014;Kennedy and Machalski 2015;Kapuścińska and Machalski 2015;Fraaije et al 2015;Machalski and Wilmsen 2015;Bardet et al 2016;Machalski and Olszewska-Nejbert 2016;Dubicka and Machalski 2017;Siversson and Machalski 2017). An important part of the studied material comes from the collection of late Prof. Andrzej Radwański, who was so successfully involved in earlier investigations of the Annopol fossils, depositional environments, and biostratigraphy (Radwański 1968;Radwański 1983, 1989).…”

Section: Introductionmentioning

confidence: 99%

Isolated pliosaurid teeth from the Albian–Cenomanian (Cretaceous) of Annopol, Poland

Madzia¹,

Machalski²

2017

Acta Geologica Polonica

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ABSTRACT:Madzia, D. and Machalski, M. 2017. Isolated pliosaurid teeth from the Albian-Cenomanian (Cretaceous) of Annopol, Poland. Acta Geologica Polonica, 67 (3), 393-403. Warszawa.Brachauchenine pliosaurids were a cosmopolitan clade of macropredatory plesiosaurs that are considered to represent the only pliosaurid lineage that survived the faunal turnover of marine amniotes during the JurassicCretaceous transition. However, the European record of the Early to early Late Cretaceous brachauchenines is largely limited to isolated tooth crowns, most of which have been attributed to the classic Cretaceous taxon Polyptychodon. Nevertheless, the original material of P. interruptus, the type species of Polyptychodon, was recently reappraised and found undiagnostic. Here, we describe a collection of twelve pliosaurid teeth from the upper Albian-middle Cenomanian interval of the condensed, phosphorite-bearing Cretaceous succession at Annopol, Poland. Eleven of the studied tooth crowns, from the Albian and Cenomanian strata, fall within the range of the morphological variability observed in the original material of P. interruptus from the Cretaceous of England. One tooth crown from the middle Cenomanian is characterized by a gently subtrihedral cross-section. Similar morphology has so far been described only for pliosaurid teeth from the Late Jurassic and Early Cretaceous. Even though it remains impossible to precisely settle the taxonomic distinctions, the studied material is considered to be taxonomically heterogeneous.

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Late late Albian (Early Cretaceous) shark teeth from Annopol, Poland

Cited by 16 publications

References 44 publications

Morphology and paleobiology of the Late Cretaceous large-sized sharkCretodus crassidens(Dixon, 1850) (Neoselachii; Lamniformes)

Morphology and paleobiology of the Late Cretaceous large-sized sharkCretodus crassidens(Dixon, 1850) (Neoselachii; Lamniformes)

Paleoenvironmental context and significance of a partial elasmosaurid skeleton from the Albian of Haute-Provence, France

Isolated pliosaurid teeth from the Albian–Cenomanian (Cretaceous) of Annopol, Poland

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