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 3 publications

(2 citation statements)

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“…"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

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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-

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Section: Phylogenetic Resultssupporting

confidence: 86%

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

Dollman

Choiniere

2022

The Anatomical Record

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“…'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

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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.

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Origins of slow growth on the crocodilian stem lineage

Botha,

Weiss,

Dollman

et al. 2023

Current Biology

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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 3 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

Origins of slow growth on the crocodilian stem lineage

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