An unusual conchorhynch from the upper Maastrichtian of the southeast Netherlands and the distinction between nautiloid and ammonoid conchorhynchs (Mollusca, Cephalopoda)

Mironenko, Aleksandr A.; Jagt, John W.M.; Jagt‐Yazykova, Elena A.

doi:10.1016/j.cretres.2021.105037

Cited by 3 publications

(3 citation statements)

References 15 publications

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“…introduced by Teichert et al (1964) and Teichert and Spinosa (1971) for rhyncholites and by Mironenko et al (2022) for conchorhynchs (fig. 2).…”

Section: Methodsmentioning

confidence: 98%

“…Some specimens were CT-scanned using a General Electric Phoenix V|tome|XS nanotube high-resolution CT scanner at the Microscopy and Imaging Facility of the American Museum of Natural History. We used the terminology and morphological parameters introduced by Teichert et al (1964) and Teichert and Spinosa (1971) for rhyncholites and by Mironenko et al (2022) for conchorhynchs (fig. 2).…”

Section: Methodsmentioning

confidence: 99%

“…Thus, identifying the exact taxon that isolated rhyncholite/ conchorhynch specimens belong to is often difficult. Therefore, the concept of parataxonomy is usually applied when describing and classifying rhyncholites and conchorhynchs (Mironenko et al, 2022). Rhyncholite and conchorhynch fossils are relatively common, in particular in the Cretaceous of Europe (Riegraf and Schmitt-Riegraf, 1995).…”

Section: Introductionmentioning

confidence: 99%

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New Discovery of Rhyncholites and Conchorhynchs (Cephalopod Jaw Elements) from the Upper Cretaceous Mount Laurel Formation of Delaware

Tajika

Landman

Koyasu

et al. 2023

American Museum Novitates

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Rhyncholites and Conchorhynchs are the calcitic elements of upper and lower jaws of cephalopods, respectively. Rhyncholites and conchorhynchs occur in relatively high abundance and are widely distributed, with a long geological range, extending from the Triassic to the Miocene. While rhyncholites and conchorhynchs are relatively common in Europe, there are only a few reports from North America. Here, we document 24 specimens of rhyncholites and 12 specimens of conchorhynchs from the Upper Cretaceous Mount Laurel Formation in Delaware. The specimens were found in isolation and, thus, identifying the taxon to which the rhyncholites and conchorhynchs belong is difficult. However, the Cretaceous nautilid Eutrephoceras occurs in the same formation, suggesting that the rhyncholites and conchorhynchs may belong to this taxon. We performed a morphometric analysis of these structures based on linear measurements. Our results reveal that some morphological parameters in rhyncholites are correlated with size. Additionally, our specimens exhibit high intraspecific variation, which may have been overlooked in previous studies.

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“…introduced by Teichert et al (1964) and Teichert and Spinosa (1971) for rhyncholites and by Mironenko et al (2022) for conchorhynchs (fig. 2).…”

Section: Methodsmentioning

confidence: 98%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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New Discovery of Rhyncholites and Conchorhynchs (Cephalopod Jaw Elements) from the Upper Cretaceous Mount Laurel Formation of Delaware

Tajika

Landman

Koyasu

et al. 2023

American Museum Novitates

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

Mitta,

Mironenko

2024

Paleontol. J.

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The Maastrichtian type area (Netherlands–Belgium): a synthesis of 250+ years of collecting and ongoing progress in Upper Cretaceous stratigraphy and palaeontology

Jagt

Claessens

Fraaije

et al. 2023

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Cretaceous limestones near Maastricht (south-east Netherlands) have been quarried at least since Roman times. In the late eighteenth century, scientific interest developed in their macrofossil content and specimens were illustrated for the first time. Amongst the early discoveries was a partial skull of a large predatory vertebrate that would play an important role in the emergence of modern palaeontology and our understanding of the concept of extinction. After decades of scientific debate, this animal was recognised as a large extinct marine relative of monitor lizards (varanoids) and named Mosasaurus. A detailed lithostratigraphy of Upper Cretaceous (Santonian-Maastrichtian) rocks was established in the Maastrichtian type area during the mid-1970s, which resulted in a renewed interest in fossil hunting by professional and amateur palaeontologists alike. During recent decades, both micro- and macrofossils have enabled a refinement of biozonations, correlations within the basin and with sections elsewhere, a greater insight into taphonomic processes and updated taxonomic interpretations. A new age model and chemostratigraphical framework is the most recent addition, permitting the placement of geoheritage in a larger frame and intensifying outreach to the public, including also virtual and augmented reality and hands-on experience to visitors of museum and (disused) quarries alike.

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An unusual conchorhynch from the upper Maastrichtian of the southeast Netherlands and the distinction between nautiloid and ammonoid conchorhynchs (Mollusca, Cephalopoda)

Cited by 3 publications

References 15 publications

New Discovery of Rhyncholites and Conchorhynchs (Cephalopod Jaw Elements) from the Upper Cretaceous Mount Laurel Formation of Delaware

New Discovery of Rhyncholites and Conchorhynchs (Cephalopod Jaw Elements) from the Upper Cretaceous Mount Laurel Formation of Delaware

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

The Maastrichtian type area (Netherlands–Belgium): a synthesis of 250+ years of collecting and ongoing progress in Upper Cretaceous stratigraphy and palaeontology

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