<i>DOLICHURANUS PRIMAEVUS</i> (THERAPSIDA: ANOMODONTIA) FROM THE MIDDLE TRIASSIC OF NAMIBIA AND ITS PHYLOGENETIC RELATIONSHIPS

Damiani, R; Vasconcelos, Cecilio C.; Renaut, Alain; Hancox, John; Yates, Adam M.

doi:10.1111/j.1475-4983.2007.00727.x

Cited by 26 publications

(25 citation statements)

References 27 publications

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“…The monophyly of Kannemeyeriiformes has been recovered in all subsequent analyses [27], [70]: inclusion of “ Dicynodon ”-grade taxa in phylogenetic analyses demonstrates that these taxa lie outside of Kannemeyeriiformes, rather than representing basal members of the kannemeyeriiform subclades. Here we define Kannemeyeriiformes as Kannemeyeria simocephalus (Weithofer, 1888) [71] and all taxa more closely related to it than to Lystrosaurus murrayi (Huxley, 1859) [72] or Dicynodon lacerticeps Owen, 1845 [73].…”

Section: Discussionmentioning

confidence: 90%

“…Previous phylogenetic analyses of kannemeyeriiform taxa [26], [68]–[70] produced conflicting topologies and included only a fraction of kannemeyeriiform diversity. Although the current analysis includes almost all valid kannemeyeriiform taxa, relationships within the clade remain weakly supported, and it is likely that they will continue to change in future studies.…”

Section: Discussionmentioning

confidence: 99%

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On the Validity and Phylogenetic Position of Eubrachiosaurus browni, a Kannemeyeriiform Dicynodont (Anomodontia) from Triassic North America

2013

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The large dicynodont Eubrachiosaurus browni from the Upper Triassic Popo Agie Formation of Wyoming is redescribed. Eubrachiosaurus is a valid taxon that differs from Placerias hesternus, with which it was previously synonymized, by greater anteroposterior expansion of the scapula dorsally and a very large, nearly rectangular humeral ectepicondyle with a broad supinator process. Inclusion of Eubrachiosaurus in a revised phylogenetic analysis of anomodont therapsids indicates that it is a stahleckeriid closely related to the South American genera Ischigualastia and Jachaleria. The recognition of Eubrachiosaurus as a distinct lineage of North American dicynodonts, combined with other recent discoveries in the eastern USA and Europe, alters our perception of Late Triassic dicynodont diversity in the northern hemisphere. Rather than being isolated relicts in previously therapsid-dominated regions, Late Triassic stahleckeriid dicynodonts were continuing to disperse and diversify, even in areas like western North America that were otherwise uninhabited by coeval therapsids (i.e., cynodonts).

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Section: Discussionmentioning

confidence: 90%

Section: Discussionmentioning

confidence: 99%

On the Validity and Phylogenetic Position of Eubrachiosaurus browni, a Kannemeyeriiform Dicynodont (Anomodontia) from Triassic North America

2013

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“…Angielczyk & Kurkin () were the first to analytically recover a cryptodont clade containing oudenodontids, rhachiocephalids and geikiids to the exclusion of dicynodontoids, and this group has also been recovered by most subsequent analyses (with the exception of the highly aberrant topology of Damiani et al . (), who recovered oudenodontids and geikiids nested deeply within Dicynodontoidea and Rhachiocephalus as the sister‐taxon of Cistecephalus + Myosaurus ). For instance, the primary analysis of Kammerer et al .…”

Section: Discussionmentioning

confidence: 99%

“…; Angielczyk & Kurkin , b; Damiani et al . ; Fröbisch ; Fröbisch & Reisz ; Angielczyk & Rubidge , ) consistently pulled these groups apart, instead finding Pylaecephalidae (usually called ‘Robertiidae’ in this literature) to be one of the earliest‐diverging clades of dicynodonts. Unexpectedly, Pylaecephalidae jumped back to being the sister‐taxon of Emydopoidea in the later, substantially expanded analysis of Kammerer et al .…”

Section: Discussionmentioning

confidence: 99%

The cranial morphology, phylogenetic position and biogeography of the upper Permian dicynodontCompsodon helmoedivan Hoepen (Therapsida, Anomodontia)

Angielczyk

Kammerer

2017

Papers in Palaeontology

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Compsodon helmoedi is an obscure dicynodont originally described based on a single specimen from the upper Permian of the Karoo Basin. The discovery of three new specimens of Compsodon from the Luangwa Basin of Zambia and two additional specimens from South African museum collections facilitates a reassessment of its cranial morphology and phylogenetic position. Compsodon is diagnosed by an autapomorphic secondary palate morphology: medial depression at anterior end of premaxillary secondary palate; medial anterior palatal ridges absent; lateral anterior palatal ridges prominent and extend to posterior end of secondary palate; Y-shaped anterior end of posterior median palatal ridge; embayment of palatal rim anterior to caniniform process divided into two depressions by a posteromedially-trending ridge. Other important characters include the presence of maxillary 'postcanines' and a postcaniniform keel; long interpterygoid vacuity; palatine pad smooth and pierced by a foramen; pineal foramen flanked by swollen eminences of parietals; parietals fused and narrowly exposed between broad postorbitals on dorsal surface of skull; and pocket-like depression on lateral surface of maxilla. Phylogenetic analysis demonstrates that Compsodon is a member of Emydopoidea, but underscores major outstanding problems in our understanding of Permian dicynodont phylogeny that require further attention. The cranial morphology of Compsodon converges on that of cryptodonts like Tropidostoma, and as such represents a unique emydopoid morphotype. The stratigraphic range of Compsodon probably spans the upper Cistecephalus and lower Daptocephalus assemblage zones, and its presence in South Africa and Zambia reinforces a pattern of small Permian dicynodonts with wide geographical ranges in southern Gondwana.

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“…, 2009). The topology for Permian taxa is primarily based on Angielczyk (2007), Fröbisch (2007), and Fröbisch & Reisz (2008), whereas that for the Triassic taxa is modified from several sources (Maisch, 2001; Vega‐Dias, Maisch & Schultz, 2004; Surkov, Kalandadze & Benton, 2005; Ray, 2006; Damiani et al. , 2007; Surkov & Benton, 2008).…”

Section: Methodsmentioning

confidence: 99%

Do extraordinarily high growth rates in Permo-Triassic dicynodonts (Therapsida, Anomodontia) explain their success before and after the end-Permian extinction?

Botha‐Brink¹,

Angielczyk²

2010

Zoological Journal of the Linnean Society

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Dicynodonts were the most diverse and abundant herbivorous therapsids of the Permo-Triassic. They include Lystrosaurus, one of the few taxa known to survive the end-Permian extinction and the most abundant tetrapod during the Early Triassic postextinction recovery. Explanations for the success of Lystrosaurus and other dicynodonts remain controversial. This study presents an assessment of dicynodont growth patterns using bone histology, with special focus on taxa associated with the end-Permian extinction event. Bone histological analysis reveals a high cortical thickness throughout the clade, perhaps reflecting a phylogenetic constraint. Growth rings are absent early in ontogeny, and combined with high vascular density, indicate rapid, sustained growth up to the subadult stage. Extraordinarily enlarged vascular channels are present in the midcortex of many dicynodonts, including adults, and may have facilitated a more efficient assimilation of nutrients and rapid bone growth compared to other therapsids. Both increased channel density and enlarged vascular channels evolved at or near the base of major radiations of dicynodonts, implying that the changes in growth and life history they represent may have been key to the success of dicynodonts. Furthermore, this exceptionally rapid growth to adulthood may have contributed to the survival of Lystrosaurus during the end-Permian extinction and its dominance during the postextinction recovery period.

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DOLICHURANUS PRIMAEVUS (THERAPSIDA: ANOMODONTIA) FROM THE MIDDLE TRIASSIC OF NAMIBIA AND ITS PHYLOGENETIC RELATIONSHIPS

Cited by 26 publications

References 27 publications

On the Validity and Phylogenetic Position of Eubrachiosaurus browni, a Kannemeyeriiform Dicynodont (Anomodontia) from Triassic North America

On the Validity and Phylogenetic Position of Eubrachiosaurus browni, a Kannemeyeriiform Dicynodont (Anomodontia) from Triassic North America

The cranial morphology, phylogenetic position and biogeography of the upper Permian dicynodontCompsodon helmoedivan Hoepen (Therapsida, Anomodontia)

Do extraordinarily high growth rates in Permo-Triassic dicynodonts (Therapsida, Anomodontia) explain their success before and after the end-Permian extinction?

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