A new paralligatorid (Crocodyliformes, Neosuchia) from the mid-Cretaceous of Jilin Province, northeastern China

Rummy, Paul; Wu, Xiaochun; Clark, James M.; Zhao, Qi; Chen, Jin; Shibata, Masateru; Jin, Fen; Xu, Xing

doi:10.1016/j.cretres.2021.105018

Cited by 5 publications

(1 citation statement)

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“…bonapartei because evidence of uncinate processes or uncinate scars was lacking from a total of 13 wellpreserved vertebral ribs observed in two individuals (MCZ 4037, 4038). The ancestral state reconstruction (ASR) was performed using RStudio 4.1.2, using an informal species-level cladogram (supertree) compiled from the results of 23 phylogenetic studies of varying scope across Archosauria [45][46][47][48][49][50][51][52][53][54][55][56][57][58][59][60][61][62][63] . To add a phylogenetic tree to the informal cladogram, at least one common taxon present in both trees was used as a topological landmark, and the phylogenetic tree was grafted onto the informal cladogram at the phylogenetic position of the common taxon.…”

Section: Methodsmentioning

confidence: 99%

Deep reptilian evolutionary roots of a major avian respiratory adaptation

2023

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Vertebral ribs of the anterior thorax in extant birds bear bony prongs called uncinate processes, which improve the mechanical advantage of mm. appendicocostales to move air through the immobile lung and pneumatic air sacs. Among non-avian archosaurs, broad, cartilaginous uncinate processes are present in extant crocodylians, and likely have a ventilatory function. Preserved ossified or calcified uncinate processes are known in several non-avian dinosaurs. However, whether other fossil archosaurs possessed cartilaginous uncinate processes has been unclear. Here, we establish osteological correlates for uncinate attachment to vertebral ribs in extant archosaurs, with which we inferred the presence of uncinate processes in at least 19 fossil archosaur taxa. An ancestral state reconstruction based on the infer distribution suggests that cartilaginous uncinate processes were plesiomorphically present in Dinosauria and arguably in Archosauria, indicating that uncinate processes, and presumably their ventilatory function, have a deep evolutionary history extending back well beyond the origin of birds.

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Section: Methodsmentioning

confidence: 99%

Deep reptilian evolutionary roots of a major avian respiratory adaptation

2023

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A review of the non‐semiaquatic adaptations of extinct crocodylomorphs throughout their fossil record

Pochat‐Cottilloux

2024

The Anatomical Record

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Crocodylomorphs constitute a clade of archosaurs that have thrived since the Mesozoic until today and have survived numerous major biological crises. Contrary to historic belief, their semiaquatic extant representatives (crocodylians) are not living fossils, and, during their evolutionary history, crocodylomorphs have evolved to live in a variety of environments. This review aims to summarize the non‐semiaquatic adaptations (i.e., either terrestrial or fully aquatic) of different groups from different periods, highlighting how exactly those different lifestyles are inferred for those animals, with regard to their geographic and temporal distribution and phylogenetic relationships. The ancestral condition for Crocodylomorpha seems to have been a terrestrial lifestyle, linked with several morphological adaptations such as an altirostral skull, long limbs allowing a fully erect posture and a specialized dentition for diets based on land. However, some members of this clade, such as thalattosuchians and dyrosaurids display adaptations for an opposite, aquatic lifestyle, interestingly inferred from the same type of morphological observations. Finally, new techniques for inferring the paleobiology of those extinct animals have been put forward in the last decade, appearing as a complementary approach to traditional morphological descriptions and comparisons. Such is the case of paleoneuroanatomical (CT scan data), histological, and geochemical studies.

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Crocodyliform remains from the Upper Cretaceous of Central Asia – evidence for one of the oldest Crocodylia?

Kuzmin

2022

Cretaceous Research

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A new paralligatorid (Crocodyliformes, Neosuchia) from the mid-Cretaceous of Jilin Province, northeastern China

Cited by 5 publications

References 40 publications

Deep reptilian evolutionary roots of a major avian respiratory adaptation

Deep reptilian evolutionary roots of a major avian respiratory adaptation

A review of the non‐semiaquatic adaptations of extinct crocodylomorphs throughout their fossil record

Crocodyliform remains from the Upper Cretaceous of Central Asia – evidence for one of the oldest Crocodylia?

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