New records of nautiloid and ammonoid cephalopod fossils in peninsular Thailand

Tongtherm, Kittichai; Nabhitabhata, Jaruwat; Srisuk, Paladej; Nutadhira, Thammarat; Tonnayopas, Danupon

doi:10.1007/s13358-015-0108-8

Cited by 3 publications

(4 citation statements)

References 15 publications

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“…The 16 specimens listed as holotypes and paratypes by Schastlivceva ( 1988 ) from different parts of Russia and Kazakhstan do not exceed diameters of 17 mm. The few known Japanese orthoceratoids have diameters below 10 mm (Niko & Ehiro, 2020 ; Niko et al, 2016 ) and the fragmentary specimens from Thailand are even smaller (Tongtherm & Nabhitabhata, 2018 ; Tongtherm et al, 2016 ). Quenstedt’s ( 1849 ) specimens with a diameter of “7/4 inch” (ca.…”

Section: Resultsmentioning

confidence: 99%

“…Remarks : The only known specimen was first described as Tienoceras sp. A in Tongtherm et al ( 2016 ) and later established as new species and genus by Tongtherm and Nabhitabhata ( 2018 ). However, the holotype is relatively poorly preserved, and judging by the illustrations, it is possible that the reported depressed cross section is a result of compaction or erosion.…”

Section: Systematic Palaeontologymentioning

confidence: 98%

“…Michelinoceras sp. A in Tongtherm et al ( 2016 ) from the Anisian of Thailand possibly belongs to Paratrematoceras due to its narrow siphuncle and orthochoanitic septal necks. Several species from Olenekian to Anisian deposits have been assigned to Paratrematoceras by Grădinaru et al ( 2007 ), but since they were not accompanied by illustrations, they represent nomina nuda and the presence of the genus in these rocks is unconfirmed.…”

Section: Systematic Palaeontologymentioning

confidence: 99%

“…While their species definitions involve clear diagnoses and adequate illustrations of the type material, comparisons with other species of Trematoceras are restricted to few species only, making differentiation between the species with overlapping definitions difficult. The new genus Phatthalungoceras was recently established based on material from Thailand (Tongtherm & Nabhitabhata, 2018 ; Tongtherm et al, 2016 ). However, the only known specimen of this genus is relatively poorly preserved and its validity difficult to assess without additional material.…”

Section: History Of Research On Triassic Orthoceratoidsmentioning

confidence: 99%

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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: Resultsmentioning

confidence: 99%

Section: Systematic Palaeontologymentioning

confidence: 98%

Section: Systematic Palaeontologymentioning

confidence: 99%

Section: History Of Research On Triassic Orthoceratoidsmentioning

confidence: 99%

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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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Karst Geoheritage of the Red Stone Forest in the Xiangxi UNESCO Global Geopark: Chromogenic Factors, Microgeomorphology and Dissolution Behaviour

Wu,

Zhang,

Wang

et al. 2024

Geoheritage

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Ordovician geology of the Sibumasu Block, SE Asia

Agematsu

2023

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This paper describes the Ordovician stratigraphy of the Sibumasu Block, which formed part of equatorial peri-Gondwana during the early Palaeozoic, and summarizes the palaeoenvironmental conditions that prevailed during that time. Upper Cambrian sequences are commonly dominated by coarse-grained clastic rocks of shallow marine origin. Lithology of the Lower Ordovician varies from region to region, with fine-grained clastic rocks in Shan Plateau, shallow-marine clastic rocks in northern to western Thailand, and shallow-marine carbonate rocks in southern Thailand to northwestern Malaysia. Middle Ordovician strata consist entirely of shallow- to deeper-water carbonate rocks, with the exception of tubidites in midwestern Malaysia. Upper Ordovician rocks show an overall deeper environment, and the uppermost Ordovician consists of pelagic and deeper, fine-grained clastic rocks. On the basis of palaeobiogeographical data, the Sibumasu Block was adjacent to Western Australia throughout the early Palaeozoic. Upper Cambrian rhyolitic rocks in Shan Plateau and Lower to Middle Ordovician volcanics in midwestern Malaysia may have formed as a result of tectonomagmatism associated with subduction of the Proto-Tethys Ocean plate into the northern Gondwanan margin. The close similarity of Late Ordovician fossil assemblages from Sibumasu and South China may be due to a sea level rise during this time.

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New records of nautiloid and ammonoid cephalopod fossils in peninsular Thailand

Cited by 3 publications

References 15 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

Karst Geoheritage of the Red Stone Forest in the Xiangxi UNESCO Global Geopark: Chromogenic Factors, Microgeomorphology and Dissolution Behaviour

Ordovician geology of the Sibumasu Block, SE Asia

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