A basal ichthyosauriform with a short snout from the Lower Triassic of China

  title={A basal ichthyosauriform with a short snout from the Lower Triassic of China},
  author={Ryosuke Motani and Da-yong Jiang and Guan-bao Chen and Andrea Tintori and Olivier Rieppel and Cheng Ji and Jian-dong Huang},
The incompleteness of the fossil record obscures the origin of many of the more derived clades of vertebrates. One such group is the Ichthyopterygia, a clade of obligatory marine reptiles that appeared in the Early Triassic epoch, without any known intermediates. Here we describe a basal ichthyosauriform from the upper Lower Triassic (about 248 million years ago) of China, whose primitive skeleton indicates possible amphibious habits. It is smaller than ichthyopterygians and had unusually large… 

A primitive ichthyosaur from the Lower Triassic of Zhebao, Guangxi Province, southwestern China (#61178)

  • Medicine
  • 2021
A newly discovered primitive ichthyosaur collected from the Lower Triassic Luolou Formation, Zhebao region, northwest margin of the Nanpanjiang Basin is described, identified to be a basal ichysosaur based on the presence of unique combination features of primitive ICHthyosaurs.

A new basal ichthyosauromorph from the Lower Triassic (Olenekian) of Zhebao, Guangxi Autonomous Region, South China

Here we describe a newly discovered basal ichthyosauromorph from the Lower Triassic of South China, Baisesaurus robustus gen. et sp. nov. The only known specimen of this new species was collected

Early Triassic ichthyopterygian fossils from the Russian Far East

Ichthyopterygia is a major clade of reptiles that colonized the ocean after the end-Permian mass extinction, with the oldest fossil records found in early Spathian substage (late Olenekian, late

A large marine eosauropterygian reptile with affinities to nothosauroid diapsids from the Early Triassic of British Columbia, Canada

Sauropterygia, one of the main clades of Mesozoic marine reptiles, diversified shortly after the Permo-Triassic biotic crisis and afterwards remained one of the major components of Early Triassic

A large aberrant stem ichthyosauriform indicating early rise and demise of ichthyosauromorphs in the wake of the end-Permian extinction

It now appears that ichthyosauriforms evolved rapidly within the first one million years of their evolution, in the Spathian (Early Triassic), and their true diversity has yet to be fully uncovered.

Ichthyosaurs from the Upper Triassic (Carnian–Norian) of the New Siberian Islands, Russian Arctic, and their implications for the evolution of the ichthyosaurian basicranium and vertebral column

The first ichthyosaurian specimens discovered from the Upper Triassic of the Russian Arctic (Kotelny Island, New Siberian Islands) are described and anatomy, indicating toretocnemid or parvipelvian affinities, further supports the previously hypothesised sister-group relationships between these two clades.

A new ichthyosaur from the Late Jurassic of north-west Patagonia (Argentina) and its significance for the evolution of the narial complex of the ophthalmosaurids

It is proposed that the division of the external nares (complete or partly osseous) was related functionally to the separation of the air passage from the outlet of nasal salt glands in such a way that the salt glands could be evacuated underwater, while the air passages could be closed by a valvular system.

Middle–Upper Triassic marine vertebrates of Mallorca (Balearic Islands, western Mediterranean)

An anterior caudal vertebra of a basal ichthyosauriform similar to Grippidia is described from the Ladinian carbonate ramps of the Muschelkalk of Mallorca, which fills a biogeographic gap for the group, hitherto only known from the eastern and western margins of Panthalassa.

The oldest record of Saurosphargiformes (Diapsida) from South China could fill an ecological gap in the Early Triassic biotic recovery

Discovery of Pomolispondylus biani extends the known range of Saurosphargiformes and increases the taxic and ecological diversity of the Nanzhang-Yuan’an Fauna, suggesting this fauna represents a transitional stage during recovery rather than its endpoint.

Ancestral Body Plan and Adaptive Radiation of Sauropterygian Marine Reptiles

This skeleton from the Early Triassic in South China is reported, representing the oldest known complete specimen related to Sauropterygia and provides an evolutionary framework of sauropterygian marine reptiles and highlights the integrations of both convergences and divergences when an emerging animal lineage arises.



Terrestrial Origin of Viviparity in Mesozoic Marine Reptiles Indicated by Early Triassic Embryonic Fossils

The new specimen contains the oldest fossil embryos of Mesozoic marine reptile that are about 10 million years older than previous such records and strongly indicates a terrestrial origin of viviparity, in contrast to the traditional view.

Unexpected skeletal histology of an ichthyosaur from the Middle Jurassic of Patagonia: implications for evolution of bone microstructure among secondary aquatic tetrapods

The compact and dense ribs in these parvipelvian Mollesaurus ribs show that advance ichthyosaurs were ecologically more diverse than previously thought and that the lightening of the skeleton reversed, as also occurred in the evolution of cetacean, at least once along the evolutionary history of ICHthyosaurs.

The Enigmatic Marine Reptile Nanchangosaurus from the Lower Triassic of Hubei, China and the Phylogenetic Affinities of Hupehsuchia

It is found that four lineages of marine reptiles are recognized almost regardless of which of these features were included in the analysis: Hupehsuchia-Ichthyopterygia-Saurosphargidae clade, Thalattosauria, and Helveticosaurus, and the interrelationships among these four depended on the combination of aquatic adaptations to be included.

Hupehsuchus, an Enigmatic Aquatic Reptile from the Triassic of China, and the Problem of Establishing Relationships

The difficulty in determining the relationship of the Hupehsuchia may be attributed to the limited knowledge of the fossil record of diapsid reptiles in the late Permian and early Triassic, as well as the great amount of convergence exhibited by secondarily aquatic reptiles.

Ichthyosaurs (Reptilia, Ichthyosauria) from the Lower and Middle Triassic Sulphur Mountain Formation, Wapiti Lake area, British Columbia, Canada

Ichthyosaurs are found in the Lower and Middle Triassic members of the Sulphur Mountain Formation in the Wapiti Lake area, British Columbia. Three species are recognized: Pessosaurus sp. in the

The Early Triassic Eosauropterygian Majiashanosaurus discocoracoidis, Gen. Et Sp. Nov. (Reptilia, Sauropterygia), from Chaohu, Anhui Province, People's Republic of China

A new sauropterygian specimen was found co-occurring with the ichthyopterygian Chaohusaurus from the Upper Member of the Nanlinghu Formation, of Olenekian (Spathian, Early Triassic) age, for which a new taxon, Majiashanosaurus discocoracoidis, gen. et sp.

Absence of Suction Feeding Ichthyosaurs and Its Implications for Triassic Mesopelagic Paleoecology

It is most likely that Triassic and Early Jurassic ichthyosaurs were ‘ram-feeders’, without any beaked-whale-like suction feeder among them, which matches the fossil record of coleoids, which indicates the absence of soft-bodied deepwater species in the Triassic.

Early Mesozoic thrust tectonics of the northwest Zhejiang region (Southeast China)

The NW Zhejiang region of South China occupies a key tectonic position near the suture zone of the Yangtze and Cathaysian blocks and is of critical importance for the assembly of East Asia.

"Pachyostosis" in aquatic amniotes: a review.

  • A. Houssaye
  • Environmental Science
    Integrative zoology
  • 2009
The functional consequences of "pachyostosis," and notably its importance for buoyancy control in the context of hydrostatic regulation of the body trim, are discussed and opposed to the requirement of improved swimming abilities in the case of a hydrodynamic mode of trim regulation.