Revised anatomy, taxonomy and biostratigraphy of <i>Notochampsa istedana</i> Broom, 1904, a Lower Jurassic crocodyliform from the Clarens Formation (Stormberg Group), and its implications for early crocodyliform phylogeny

Dollman, Kathleen N.; Clark, James M.; Viglietti, Pia A.; Browning, Claire; Choiniere, Jonah N.

doi:10.1080/14772019.2021.1948926

Cited by 6 publications

(2 citation statements)

References 69 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…"Protosuchia" includes monophyletic groups Notochampsoidea, Gobiosuchidae, and Shartegosuchoidea. The interrelationships found among these groups are generally consistent with other prior analyses (Clark, 2011;Dollman et al, 2018Dollman et al, , 2021Osm olska et al, 1997) but are summarized below. Within Notochampsoidea in four of the six MPTs, Notochampsidae is a sister group to Protosuchidae.…”

Section: Phylogenetic Resultssupporting

confidence: 86%

Palate evolution in early‐branching crocodylomorphs: Implications for homology, systematics, and ecomorphology

Dollman

Choiniere

2022

The Anatomical Record

Self Cite

View full text Add to dashboard Cite

Living crocodylomorphs have an ossified secondary palate with a posteriorly positioned choana that enables their semi-aquatic, predatory ecology. In contrast, the earliest branching members of Crocodylomorpha have an open palate with anteriorly positioned choanae. The evolution of an ossified secondary palate and a posteriorly positioned choana features strongly in hypotheses of broad-scale phylogenetic relationships within Crocodylomorpha. Renewed investigations into palatal morphology among extinct members of the clade show surprising variability in the anatomy of the palate, with at least one and potentially a second independent occurrence of "eusuchian-type" palate outside of Eusuchia. Understanding the trajectory of crocodylomorph palatal evolution is, therefore, a key to inferring crocodylomorph interrelationships and ecomorphology. To document early-branching crocodylomorph palatal anatomy, we developed an anatomical comparative dataset using computed tomography scan data and literature, comprising 12 early-branching crocodylomorph taxa. To understand discrete phenotypic changes in palatal structure, we compiled a phylogenetically broadly sampled character-taxon matrix from the existing literature, and revised its palatal characters, adding 10 new palatal characters. Our comparative anatomical investigations allow us to propose an adapted hypothesis for the closure of the palate and the posterior migration of the choana. Our phylogenetic findings corroborate previous research showing that non-crocodyliform crocodylomorphs ("sphenosuchians") are paraphyletic, with the exclusion of the clade Hallopodidae. Non-mesoeucrocodylian crocodyliforms ("protosuchians") are paraphyletic, but form three monophyletic clades: Notochampsoidea, Shartegosuchoidea, and Gobiosuchidae. We find a potential association between secondary palate development and dietary shifts, particularly with regard to hypothesized origins of herbivory. Grant sponser(s): NRF AOP grants (98800 and 118794), DSI-

show abstract

Section: Phylogenetic Resultssupporting

confidence: 86%

Palate evolution in early‐branching crocodylomorphs: Implications for homology, systematics, and ecomorphology

Dollman

Choiniere

2022

The Anatomical Record

Self Cite

View full text Add to dashboard Cite

show abstract

“…'Protosuchia ' Mook 1934 is a paraphyletic group formed by the most primitive crocodyliforms (Benton and Clark 1988). Following the Lower Jurassic, protosuchians have only been discovered in the Northern Hemisphere (e.g., Fiorelli and Calvo 2007;Martínez et al 2018;Dollman et al 2021), with the only exception of Neuquensuchus universitas from the Santonian (Upper Cretaceous) of the Bajo de la Carpa Formation in Argentina (Fiorelli and Calvo 2007). The authors found the species to be a member of an Asian clade and proposed an early Cretaceous dispersal event from said continent to explain its presence in what is now South America.…”

Section: 'Protosuchia'mentioning

confidence: 99%

isolated Mesoeucrocodylian tooth crown from the lower Cretaceous cerro La Isla pterosaur site in the Atacama region, northern Chile

Bajor¹,

Muñoz

Catalán³

et al. 2022

Boletín MNHN

View full text Add to dashboard Cite

We describe the first crocodyliform fossil found in continental deposits from the Lower Cretaceous of the Quebrada Monardes Formation on Cerro La Isla, Atacama region, northern Chile. The material consists of a single, poorly preserved tooth crown (SGO.PV 1160), whose enamel surfaces bear tightly-packed apicobasal ridges. Our comparisons of SGO.PV 1160 with the dental morphology of possible taxa that it may belong to suggest a hitherto unknown pholidosaurid, or, more likely, notosuchian. Therefore, the tooth crown is here provisionally identified as Mesoeucrocodylia indet., pending future discoveries of more complete material. This find increases the known biodiversity in the Lower Cretaceous deposits of Cerro La Isla, as well as the importance of the fossil site, since pholidosaurids have not been reported from Chile, and if it proves to be notosuchian, it may represent the earliest known taxon of this group from South America, and the second earliest in the world.

show abstract

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

Pochat‐Cottilloux

2024

The Anatomical Record

View full text Add to dashboard Cite

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.

show abstract

Revised anatomy, taxonomy and biostratigraphy of Notochampsa istedana Broom, 1904, a Lower Jurassic crocodyliform from the Clarens Formation (Stormberg Group), and its implications for early crocodyliform phylogeny

Cited by 6 publications

References 69 publications

Palate evolution in early‐branching crocodylomorphs: Implications for homology, systematics, and ecomorphology

Palate evolution in early‐branching crocodylomorphs: Implications for homology, systematics, and ecomorphology

isolated Mesoeucrocodylian tooth crown from the lower Cretaceous cerro La Isla pterosaur site in the Atacama region, northern Chile

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

Contact Info

Product

Resources

About