A new drepanosauromorph, Ancistronychus paradoxus n. gen. et sp., from the Chinle Formation of Petrified Forest National Park, Arizona, USA

@article{Gonalves2019AND,
  title={A new drepanosauromorph, Ancistronychus paradoxus n. gen. et sp., from the Chinle Formation of Petrified Forest National Park, Arizona, USA},
  author={Gabriela Ribeiro Gonçalves and Christian A. Sidor},
  journal={PaleoBios},
  year={2019},
  url={https://api.semanticscholar.org/CorpusID:210142302}
}
Ancistronychus paradoxus is described from the Chinle Formation in Petrified Forest National Park, Arizona based on the ungual phalanx of the second digit of the manus and suggests that different drepanosauromorphs used their enlarged second manual unGuals for distinct functions enabling them to fill different ecological niches.
[PDF] Semantic Reader
5 Citations
Highly Influential Citations
2
Background Citations
2
Results Citations
1

Figures from this paper

5 Citations

A New Drepanosauromorph (Diapsida) from East–Central New Mexico and Diversity of Drepanosaur Morphology and Ecology at the Upper Triassic Homestead Site at Garita Creek (Triassic: Mid-Norian)

The identification of isolated and three-dimensional drepanosauromorph fossils expands the diversity of the clade and demonstrates the usefulness of incorporating microvertebrate data into assemblage studies.

Using Manual Ungual Morphology to Predict Substrate Use in the Drepanosauromorpha and the Description of a New Species

The results support the inference of arboreality in some drepanosauromorph species and find that the manual unguals of Ancistronychus paradoxus and Skybalonyx skapter fit within the range of variation of modern fossorial and subterranean taxa, which expands the functional diversity of the Drepanosaurusomorpha within the Chinle Formation.

The femora of Drepanosauromorpha (Reptilia: Diapsida): Implications for the functional evolution of the thigh of Sauropsida

Several characteristics of drepanosauromorph femora, including a hemispherical proximal articular surface, prominent asymmetry in the proximodistal length of the tibial condyles, and a deep intercondylar sulcus, are plesiomorphies shared with early diapsids, and suggest an increased capacity for femoral adduction and protraction relative to most other Permo‐Triassic diapids.

DIFFERENCES IN THE HINDLIMB ANATOMY IN THE TWO SPECIES OF THE LATE TRIASSIC DREPANOSAUROMORPH DIAPSID MEGALANCOSAURUS INDICATE HABITAT PARTITIONING WITHIN THE ARBOREAL ENVIRONMENT

A re-examination of the hindlimb architecture of both Megalancosaurus species indicates that M. preonensis and M. endennae exploited different microhabitats within the arboreal environment as for many extant species belonging to the same genus, like caribbean Anoles.

Masticatory mechanisms, dental function, and diet in Triassic trilophosaurids (Reptilia: Allokotosauria)

This study is among the first to infer the diet of Late Triassic trilophosaurid reptiles from southwestern North America within a quantitative comparative framework, and may suggest previously unknown craniomandibular specializations.

49 References

New insights into Late Triassic dinosauromorph-bearing assemblages from Texas using apomorphy-based identifications

Author(s): Lessner, Emily J.; Parker, William G.; Marsh, Adam D.; Nesbitt, Sterling J.; Irmis, Randall B.; Mueller, Bill D. | Abstract: The Upper Triassic Dockum Group of Garza County, Texas (lower,…

The Phylogeny of Living and Extinct Pangolins (Mammalia, Pholidota) and Associated Taxa: A Morphology Based Analysis

The fossil record of pangolins would seem to support a European origin for the modern forms, with subsequent dispersal into sub-Saharan African and then to southern Asia, and the phylogeny produced in this analysis is consistent with such a scenario.

The Late Triassic Archosauromporph Trilophosaurus as an Arboreal Climber

The functional morphology of Trilophosaurus was reexamined using a qualitative functional morphological analysis of the skeleton, a quantitative examination of claw curvature, and a quantitativeexamination of manus/trunk and pes/ trunk rarios, providing ample evidence to suggest that Trilphosaurus was arboreal.

A novel archosauromorph from Antarctica and an updated review of a high-latitude vertebrate assemblage in the wake of the end-Permian mass extinction

A novel archosauromorph from Antarctica and an updated review of a high-latitude vertebrate assemblage in the wake of the end-Permian mass extinction are presented.

Scaptochelys: Generic Revision and Evolution of Gopher Tortoises

The homologies of the chelonian carpus and those of land tortoises in particular are reevaluated utilizing newly acquired data from Eocene and Oligocene testudinids.

Dolabrosaurus aquatilis, a small lepidosauromorph reptile from the Upper Triassic Chinle Formation of north-central New Mexico

Comparison with other Triassic reptiles indicates that D. aquatilis is most closely related to Drepanosaurus unguicaudatus, a small, enigmatic lepidosauromorph from the Upper Triassic Zorzino Formation of the Italian Alps, and both species are assigned to a new family, Drepanosauridae.

A New and Unusual Aquatic Reptile from the Lockatong Formation of New Jersey (Late Triassic, Newark Supergroup)

Abstract Hypuronector limnaios (n. gen., n. sp.) is a small reptile described from the Late Triassic (Late Carnian) age Lockatong Formation of the Newark basin of New Jersey. It occurs in the…

A bird-like skull in a Triassic diapsid reptile increases heterogeneity of the morphological and phylogenetic radiation of Diapsida

The phylogenetic position of drepanosaurids indicates the presence of archaic Permian clades among Triassic small reptile assemblages and that morphological convergence produced a remarkably bird-like skull nearly 100 Myr before one is known to have emerged in Theropoda.

The Origin, Early History and Diversification of Lepidosauromorph Reptiles

The reptilian group Lepidosauria diversified through the Mesozoic, survived the end-Cretaceous extinction relatively unscathed, and has more than 7,000 living species. Although originally constituted…

Kyrgyzsaurus bukhanchenkoi gen. et sp. nov., a new reptile from the triassic of southwestern Kyrgyzstan

The most prominent features of the new form are the shortened lower jaw, numerous teeth, granular body osteoderms, large supraorbital shelflike skin folds, and thick and extensive throat sac.