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

Kammerer, Christian F.; Fröbisch, Jörg; Angielczyk, Kenneth D.

doi:10.1371/journal.pone.0064203

Cited by 51 publications

(62 citation statements)

References 48 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Kammerer et al . , ; Castanhinha et al . ; although in some analyses Pylaecephalidae is recovered in a more basal position as well, see below).…”

Section: Discussionmentioning

confidence: 99%

See 2 more Smart Citations

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

Angielczyk

Kammerer

2017

Papers in Palaeontology

Self Cite

View full text Add to dashboard Cite

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.

show abstract

“…Kammerer et al . , ; Castanhinha et al . ; although in some analyses Pylaecephalidae is recovered in a more basal position as well, see below).…”

Section: Discussionmentioning

confidence: 99%

“…Kammerer et al . , , , ; Castanhinha et al . ; Angielczyk & Rubidge ; Angielczyk & Cox ; Cox & Angielczyk ; Angielczyk et al .…”

Section: Discussionunclassified

See 1 more Smart Citation

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

Angielczyk

Kammerer

2017

Papers in Palaeontology

Self Cite

View full text Add to dashboard Cite

show abstract

“…Low support values for other dicynodont families are a persistent problem in phylogenetic analyses of Anomodontia (Kammerer et al . , ; Castanhinha et al . ; Cox & Angielczyk ; Boos et al .…”

Section: Discussionmentioning

confidence: 99%

“…(), a recent iteration of the most comprehensive analysis of anomodont phylogeny (modified from Kammerer et al . , ; Castanhinha et al . ).…”

Section: Phylogenetic Analysismentioning

confidence: 99%

A new taxon of cistecephalid dicynodont from the upper Permian Kundaram Formation of India

Kammerer

Bandyopadhyay

Ray

2016

Papers in Palaeontology

Self Cite

View full text Add to dashboard Cite

A new cistecephalid dicynodont, Sauroscaptor tharavati gen. et sp. nov., is described from the upper Permian Kundaram Formation of India. This taxon is represented by specimens formerly referred to the African dicynodont genera Cistecephalus and Emydops. Sauroscaptor can be distinguished from other cistecephalids by the extremely posterior position of the pineal foramen (overhanging the edge of the occiput), bipartite nuchal crest, and relatively narrow skull roof. The recognition of Sauroscaptor as a distinct cistecephalid taxon adds to the increasing evidence for high levels of basinal endemism in this family. However, dicynodont biogeographical patterns are complex, and there is no simple relationship between inferred dispersal ability based on body size and levels of endemicity within clades.

show abstract

The fossil record of appendicular muscle evolution in Synapsida on the line to mammals: Part II—Hindlimb

Bishop,

Pierce

2023

The Anatomical Record

View full text Add to dashboard Cite

This paper is the second in a two‐part series that charts the evolution of appendicular musculature along the mammalian stem lineage, drawing upon the exceptional fossil record of extinct synapsids. Here, attention is focused on muscles of the hindlimb. Although the hindlimb skeleton did not undergo as marked a transformation on the line to mammals as did the forelimb skeleton, the anatomy of extant tetrapods indicates that major changes to musculature have nonetheless occurred. To better understand these changes, this study surveyed the osteological evidence for muscular attachments in extinct mammalian and nonmammalian synapsids, two extinct amniote outgroups, and a large selection of extant mammals, saurians, and salamanders. Observations were integrated into an explicit phylogenetic framework, comprising 80 character–state complexes covering all muscles crossing the hip, knee, and ankle joints. These were coded for 33 operational taxonomic units spanning >330 Ma of tetrapod evolution, and ancestral state reconstruction was used to evaluate the sequence of muscular evolution along the stem lineage from Amniota to Theria. The evolutionary history of mammalian hindlimb musculature was complex, nonlinear, and protracted, with several instances of convergence and pulses of anatomical transformation that continued well into the crown group. Numerous traits typically regarded as characteristically “mammalian” have much greater antiquity than previously recognized, and for some traits, most synapsids are probably more reflective of the ancestral amniote condition than are extant saurians. More broadly, this study highlights the utility of the fossil record in interpreting the evolutionary appearance of distinctive anatomies.

show abstract

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

Cited by 51 publications

References 48 publications

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

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

A new taxon of cistecephalid dicynodont from the upper Permian Kundaram Formation of India

The fossil record of appendicular muscle evolution in Synapsida on the line to mammals: Part II—Hindlimb

Contact Info

Product

Resources

About