The redescription of Malerisaurus robinsonae (Archosauromorpha: Allokotosauria) from the Upper Triassic lower Maleri Formation, Pranhita‐Godavari Basin, India

The Anatomical Record, Год журнала: 2024, Номер 307(4), С. 1315 - 1365

Опубликована: Янв. 26, 2024

Abstract Allokotosauria, a clade of non‐archosauriform archosauromorphs with broad diversity body plans, plays crucial role in better understanding the evolutionary history early diverging stem‐archosaurs. Here we provide detailed redescription Malerisaurus robinsonae , malerisaurine allokotosaur from middle Carnian—lowermost Norian lower Maleri Formation, Pranhita‐Godavari Basin, India. The new anatomical information available recently discovered and well‐preserved skeletons various allokotosaurs, such as A zendohsaurus madagaskarensis Shringasaurus indicus Puercosuchus traverorum ‐like taxa, their comparison enriches our anatomy this species. To reassess phylogenetic relationships revised its scorings included eight additional allokotosaurian species to already most comprehensive dataset focused on Permo‐Triassic archosauromorphs. We modified 70 for analysis recovered at base Malerisaurinae group earliest branch Azendohsauridae. Pamelaria dolichotrachela is found non‐malerisaurine azendohsaurid sister taxon + Azendohsaurus spp. clade. Trilophosaurid interrelationships are well resolved, Teraterpeton hrynewichorum Coelodontognathus ricovi Rutiotomodon tytthos successive earliest‐branching position Anisodontosaurus greeri Variodens inopinatus bolsters long ghost lineages Late Triassic trilophosaurid record. disparity tooth crown morphology shows that Allokotosauria disparate archosauromorph clade, exploring almost complete range basic morphologies. Trilophosaurids occupy an area dental morphospace unique among

Язык: Английский

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New insights into the postcranial anatomy of Exaeretodon riograndensis (Eucynodontia: Traversodontidae): phylogenetic implications, body mass, and lifestyle

Journal of Mammalian Evolution, Год журнала: 2025, Номер 32(1)

Опубликована: Янв. 24, 2025

Язык: Английский

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Triassic terrestrial tetrapod faunas of the Central European Basin, their stratigraphical distribution, and their palaeoenvironments

Earth-Science Reviews, Год журнала: 2025, Номер unknown, С. 105085 - 105085

Опубликована: Март 1, 2025

Язык: Английский

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An annotated checklist of Australian Mesozoic tetrapods

Alcheringa An Australasian Journal of Palaeontology, Год журнала: 2023, Номер 47(2), С. 129 - 205

Опубликована: Апрель 3, 2023

In 2020, the Australasian palaeontological association Palaeontologists (AAP) joined Australian government-supported National Species List (auNSL) initiative to compile first Fossil (auFNSL) for region. The goal is assemble comprehensive systematic data on all vertebrate, invertebrate and plant fossil taxa described date, present information both within a continuously updated open-access online framework, as series of primary reference articles in AAP's flagship journal Alcheringa. This paper spearheads these auFNSL Alcheringa publications with an annotated checklist Mesozoic tetrapods. Complete synonymy, type material, source locality, geological age bibliographical are provided 111 species formally named 2022. addition, chronostratigraphically arranged inventories documented tetrapod occurrences presented illustrations significant, exceptionally preserved and/or diagnostic specimens. most diverse order-level clades include temnospondyl amphibians (34 species), saurischian (13 species) ornithischian (12 dinosaurs (excluding ichnotaxa), plesiosaurian marine reptiles (11 species). However, numerous other groups collectively span earliest Triassic (earliest Induan) Late Cretaceous (late Maastrichtian) incorporate antecedents modern lineages, such chelonioid chelid turtles monotreme mammals. Although scarce comparison records from continents, Australia's assemblages globally important because they constitute higher-palaeolatitude faunas that evince terrestrial ecosystem evolution near ancient South Pole. pace research has also accelerated substantially over last 20 years, serves promote geoheritage asset scientific, cultural economic development. augments accessibility utility resources provides foundation ongoing exploration into unique natural history.Stephen F. Poropat [[email protected]], Western Organic Isotope Geochemistry Centre, School Earth Planetary Science, Curtin University, Bentley, Australia 6102, Australia, Age Dinosaurs Museum Natural History, Lot 1 Dinosaur Drive, Winton, Queensland 4735, Australia; Phil R. Bell [[email protected]], Palaeoscience Research Environmental Rural University New England, Armidale, Wales 2351, Lachlan J. Hart [[email protected]], Sustainability Science Biological, Sciences (BEES), Wales, Kensington, 2052, Institute, William Street, Sydney, 2010, Steven W. Salisbury [[email protected]] Biological Sciences, Queensland, Brisbane, 4072, Benjamin P. Kear [[email protected]] Evolution, Uppsala Norbyvägen 16, SE-752 36, Sweden.

Язык: Английский

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A new archosauriform species from the Panchet Formation of India and the diversification of Proterosuchidae after the end-Permian mass extinction

Royal Society Open Science, Год журнала: 2023, Номер 10(10)

Опубликована: Окт. 1, 2023

Proterosuchidae represents the oldest substantial diversification of Archosauromorpha and plays a key role in understanding biotic recovery after end-Permian mass extinction. was long treated as wastebasket taxon, but recent revisions have reduced its taxonomic content to five valid species from latest Permian Russia earliest Triassic (Induan) South Africa China. In addition these occurrences, several isolated proterosuchid bones been reported Induan Panchet Formation India for over 150 years. Following re-study historical specimens newly collected material this unit, we erect new Samsarasuchus pamelae , which is represented by most presacral vertebral column. We also describe cf. cranial, girdle limb that are not referred . Phylogenetic analyses recovered within clade Chasmatosuchinae. The diversity substantially expanded here, with at least 11 nominal currently unnamed specimens, biogeographical range encompassing present-day Africa, China, Russia, India, Brazil, Uruguay Australia. This indicates broader taxonomic, phylogenetic biogeographic than previously thought aftermath

Язык: Английский

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A redescription of Trachelosaurus fischeri from the Buntsandstein (Middle Triassic) of Bernburg, Germany: the first European Dinocephalosaurus-like marine reptile and its systematic implications for long-necked early archosauromorphs

Swiss Journal of Palaeontology, Год журнала: 2024, Номер 143(1)

Опубликована: Март 15, 2024

Abstract Some of the earliest members archosaur-lineage (i.e., non-archosauriform archosauromorphs) are characterised by an extremely elongated neck. Recent fossil discoveries from Guanling Formation (Middle Triassic) southern China have revealed a dramatic increase in known ecomorphological diversity these long-necked archosauromorphs, including fully marine and viviparous Dinocephalosaurus orientalis . These recent merit reinvestigation enigmatic Triassic diapsid fossils contemporaneous European deposits housed historical collections. Here, we provide redescription Trachelosaurus fischeri , represented single, disarticulated specimen first described 1918. Due to its unique morphology, which includes short, bifurcating cervical ribs, high presacral vertebral count, this taxon has been referred either as “protorosaurian” archosauromorph or sauropterygian. Our revision clearly shows that represents unambiguous -like outside Formation. finding important systematic implications. Trachelosauridae Abel, 1919 senior synonym for recently identified Dinocephalosauridae Spiekman, Fraser Scheyer, 2021. Based on our phylogenetic analyses, employ two extensive datasets, also corroborate previous findings tanystropheids trachelosaurids represent families within larger monophyletic group among non-crocopodan is here named Tanysauria (clade nov.). minimally composed Pectodens zhenyuensis Austronaga minuta but one analyses found probably taxonomically broader clade may include Gracilicollum latens Fuyuansaurus acutirostris considerably expands spatial temporal range Anisian Central Basin. add growing evidence presence diverse reptiles during Middle Tanysauria. possess flipper-like limbs, counts, elongate necks, thus superficially resembling Jurassic Cretaceous plesiosaurs some regards.

Язык: Английский

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‘Birds’ of two feathers: Avicranium renestoi and the paraphyly of bird-headed reptiles (Diapsida: ‘Avicephala’)

Zoological Journal of the Linnean Society, Год журнала: 2024, Номер unknown

Опубликована: Май 11, 2024

Abstract The anatomy of Late Triassic drepanosauromorphs is re-examined, with a focus on the previously published surface models holotype Avicranium renestoi from Norian North America. We comment cranial this taxon and propose new reconstruction skull mandible. Contrary to previous interpretations, entire rostrum most palate are not preserved in specimen. also suggest that some proposed plesiomorphic characters may result incomplete ossification due immaturity. These observations compiled into morphological phylogenetic dataset designed address monophyly ‘Avicephala’, group comprising Permian gliding reptiles Weigeltisauridae, chameleon-like Drepanosauromorpha. recover Weigeltisauridae as stem-saurian diapsids Drepanosauromorpha sister-group Trilophosauridae among archosauromorphs, thus implying paraphyly ‘Avicephala’. Drepanosauromorphs trilophosaurids recovered sister-taxa for first time, supported by several postcranial synapomorphies. This position reduces group’s ghost lineage now does necessarily cross Permian–Triassic boundary. However, much remains unknown early history drepanosauromorphs, evolution arboreality archosauromorph reptiles.

Язык: Английский

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Extreme neck elongation evolved despite strong developmental constraints in bizarre Triassic reptiles—implications for neck modularity in archosaurs

Royal Society Open Science, Год журнала: 2024, Номер 11(5)

Опубликована: Май 1, 2024

The Triassic radiation of vertebrates saw the emergence modern vertebrate groups, as well numerous extinct animals exhibiting conspicuous, unique anatomical characteristics. Among these, members Tanystropheidae (Reptilia: Archosauromorpha) displayed cervical vertebral elongation to an extent unparalleled in any other vertebrate. Tanystropheids were exceptionally ecologically diverse and had a wide spatial temporal distribution. This may have been related their neck anatomy, yet its evolution functional properties remain poorly understood. We used geometric morphometrics capture intraspecific variation between vertebrae comprising column among early archosauromorphs, trace evolutionary history these animals. Our results show that series reptiles can be divided into modules corresponding those extant achieved through somite shift thoracic regions, without presacral count increase—contrary crown archosaurs. suggests peculiar developmental constraint strongly affected tanystropheids. data obtained just at base archosauromorph phylogenetic tree are crucial for further studies on modularity columns not only reptile groups but well.

Язык: Английский

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Widespread azendohsaurids (Archosauromorpha, Allokotosauria) from the Late Triassic of western USA and India

Papers in Palaeontology, Год журнала: 2021, Номер 8(1)

Опубликована: Дек. 10, 2021

Abstract Archosauromorph reptiles underwent rapid lineage diversification, increases in morphological and body size disparity, expansion into new adaptive landscapes. Several of the primary early archosauromorph clades (e.g. rhynchosaurs) are easy to differentiate from others because their characteristic types, whereas more lizard‐like carnivorous forms with long necks tanystropheids) were historically all relegated groups Protorosauria or Prolacertiformes. However, it is now clear that these polyphyletic a lizard‐like, form plesiomorphic for Archosauromorpha, multiple subclades started plan. Among Malerisaurus Upper Triassic India ( M. robinsonae ) south‐western USA langstoni ). In this paper, we critically re‐evaluate genus. We find both species as valid, identify an diverging, but late‐surviving, member Azendohsauridae within Allokotosauria. Our histological analysis assessment ontogenetic changes limb bones small large individuals demonstrate skeletons grew slowly became robust through ontogeny, larger recovered at near maximum taxon. ‐like taxa common members Otischalkian–Adamanian (late Carnian mid‐Norian) faunal assemblages strata south western USA, they absent younger Revueltian holochronozone. Specimens North America show Allokotosauria had near‐Pangaean distribution much Middle Late Triassic.

Язык: Английский

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Interrelationships among Early Triassic faunas of Western Gondwana and Laurasia as illuminated by a new South American benthosuchid temnospondyl

The Anatomical Record, Год журнала: 2024, Номер 307(4), С. 726 - 743

Опубликована: Янв. 19, 2024

Abstract The End‐Permian Mass Extinction marked a critical turning point in Earth's history, and the biological recovery that followed crisis led to emergence of several modern vertebrate invertebrate taxa. Even considering importance Early Triassic biotic for evolution faunas floras, our knowledge this event is still hindered by sparse sampling crucial geological formations. This leaves understanding ecosystems fundamentally biased toward productive historically well‐explored units. Recent surveys poorly known Gondwanan localities, such as those within Sanga do Cabral Formation southern Brazil, have unveiled insights into terrestrial ecosystems, shedding light on diverse previously unknown tetrapod fauna. Here, we report discovery new temnospondyl genus species Lower Formation. taxon can be confidently assigned Benthosuchidae, stereospondyl clade with distribution restricted East European Platform. Phylogenetic analysis confirms relationship trematosaurian lineage, being closely related Benthosuchus . Our results raise questions about biogeographical history stereospondyls after suggest potential connection between Russian South American faunas. Further investigations are needed thoroughly explore dispersal routes may explain seemingly unusual pattern.

Язык: Английский

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