Treatise Online no. 171: Part M, Coleoidea. Chapter 23F: Systematic descriptions: Decabrachia

Fuchs, Dirk

doi:10.17161/to.vi.21456

Cited by 3 publications

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References 75 publications

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“…It is possible that this pattern is caused by taphonomic processes; however, one would expect them to be preserved since recrystalised shell remains are not uncommon (Rieber, 1973 ). The coleoids described by Rieber ( 1970 , 1973 , 1974 ) and in this study show that Triassic coleoids need more research, because even though their global diversity seems to be lower than in later Mesozoic coleoids (e.g., Fuchs, 2020 , 2023 ), they show considerable variability. Breviconoteuthis is a member of the Phragmoteuthida, which are considered to possibly comprise putatitve stem-octobrachians and therefore are of high relevance in deciphering the early evolution of the Coleoidea (Fuchs & Donovan, 2018 ).…”

Section: Discussionmentioning

confidence: 60%

Orthoceratoid and coleoid cephalopods from the Middle Triassic of Switzerland with an updated taxonomic framework for Triassic Orthoceratoidea

Pohle,

Klug

2024

Swiss J Palaeontol

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Orthoconic cephalopods are subordinate, but persistent, widespread and regionally abundant components of Triassic marine ecosystems. Here, we describe unpublished specimens from the Anisian (Middle Triassic) Besano Formation at Monte San Giorgio, Switzerland. They can be assigned to two major but unrelated lineages, the Coleoidea and the Orthoceratoidea. The orthoceratoids belong to Trematoceras elegans (Münster, 1841) and occur regularly within the Besano Formation, are uniform in size, and have few available morphological characters. In contrast, coleoids are more diverse and appear to be restricted to shorter intervals. A new coleoid is described as Ticinoteuthis chuchichaeschtli gen. et sp. nov. To better put the orthoceratoids of the Besano Formation into perspective, we also synthesise the current taxonomy of Triassic orthoceratoids on a global scale. The currently used scheme is largely outdated, with very little taxonomic progress in the past 100 years. Despite previous research showing the distinctness of Triassic orthoceratoids from Palaeozoic taxa, they are still commonly labelled as “Orthoceras” or “Michelinoceras”, which are confined to the Palaeozoic. We show that Triassic orthoceratoids probably belong to a single lineage, the Trematoceratidae, which can be assigned to the Pseudorthocerida based on the embryonic shell and endosiphuncular deposits. Many Triassic species can probably be assigned to Trematoceras, but there are at least two additional Triassic orthoceratoid genera, Paratrematoceras and Pseudotemperoceras. Finally, we review the palaeobiogeographic and stratigraphic distribution of the group and outline possible future research directions.

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Section: Discussionmentioning

confidence: 60%

Orthoceratoid and coleoid cephalopods from the Middle Triassic of Switzerland with an updated taxonomic framework for Triassic Orthoceratoidea

Pohle,

Klug

2024

Swiss J Palaeontol

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Beloptera Longa Naef, 1922 (Cephalopoda: Coleoidea) From the Late Eocene (Palaeogene) of Ukraine

Dernov

2024

Actapalrom

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Beloptera longa Naef, 1922 and Beloptera aff. longa Naef, 1922 have been described from the Priabonian Mandrykivka Beds of the Rybalsky Quarry Konzentrat-Lagerstätte in addition to previously known Beloptera belemnoidea de Blainville, 1825, B. cf. longa Naef, 1922, Belosaepia blainvillei (Deshayes, 1835) and Vasseuria occidentalis Munier-Chalmas, 1880. The geographical and stratigraphic distribution of the species Beloptera longa, which was previously recorded only in the Bartonian of England, has been expanded. Cephalopod assemblages from the Priabonian of Ukrainian consist of the genera Beloptera, Vasseuria, Belosaepia, Aturia and Eutrephoceras.

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Beloptera Longa Naef, 1922 (Cephalopoda: Coleoidea) From the Late Eocene (Palaeogene) of Ukraine

Dernov

2024

Actapalrom

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Treatise Online no. 171: Part M, Coleoidea. Chapter 23F: Systematic descriptions: Decabrachia

Cited by 3 publications

References 75 publications

Orthoceratoid and coleoid cephalopods from the Middle Triassic of Switzerland with an updated taxonomic framework for Triassic Orthoceratoidea

Orthoceratoid and coleoid cephalopods from the Middle Triassic of Switzerland with an updated taxonomic framework for Triassic Orthoceratoidea

Beloptera Longa Naef, 1922 (Cephalopoda: Coleoidea) From the Late Eocene (Palaeogene) of Ukraine

Beloptera Longa Naef, 1922 (Cephalopoda: Coleoidea) From the Late Eocene (Palaeogene) of Ukraine

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