New materials of the enigmatic dicynodont<i>Abajudon kaayai</i>(Therapsida, Anomodontia) from the lower Madumabisa Mudstone Formation, middle Permian of Zambia

Olroyd, Savannah L.; Sidor, Christian A.; Angielczyk, Kenneth D.

doi:10.1080/02724634.2017.1403442

Cited by 26 publications

(56 citation statements)

References 57 publications

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“…; Cox & Angielczyk ), which Olroyd et al . () correlated with the Pristerognathus AZ. Another primitive endothiodont, Niassodon mfumukasi , is known from Cistecephalus AZ equivalent strata in northern Mozambique (Castanhinha et al .…”

Section: Discussionmentioning

confidence: 90%

“…; Olroyd et al . ). This pattern, where more derived endothiodonts obtain a wider geographical distribution as one moves upwards stratigraphically, led Olroyd et al .…”

Section: Discussionmentioning

confidence: 97%

“…; Olroyd et al . ). It is also possible, however, that differences in biogeographic pattern are simply the result of an undersampled Guadalupian record (Olroyd et al .…”

Section: Discussionmentioning

confidence: 97%

“…Based on this, Olroyd et al . () recently correlated the lowermost fossiliferous horizon (R1) of the Ruhuhu Formation with the lower Madumabisa Mudstone Formation, both of which have been correlated with the Tapinocephalus AZ, or possibly even the Eodicynodon AZ (Simon et al . ; Sidor et al .…”

Section: Discussionmentioning

confidence: 99%

“…This pattern, where more derived endothiodonts obtain a wider geographical distribution as one moves upwards stratigraphically, led Olroyd et al . () to suggest that the evolution and radiation of the endothiodonts began closer to Zambia and Tanzania than to the Main Karoo Basin. As such, it is therefore possible that Endothiodon , having appeared earlier in the mid‐Permian in lower latitude regions of Gondwana, could have penetrated the northern reaches of the Main Karoo Basin by the early Capitanian ( Tapinocephalus AZ; see Day et al .…”

Section: Discussionmentioning

confidence: 99%

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Vertebrate assemblages from the north-central Main Karoo Basin, South Africa, and their implications for mid-Permian biogeography

Groenewald

Day

Rubidge

2019

LET

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The rich fossil vertebrate record from the Beaufort Group, Main Karoo Basin, provides a global standard for mid‐Permian to Mid‐Triassic continental faunas. However, recent studies have demonstrated variability in the composition of contemporaneous faunas across Gondwana. This raises the question of how much the vertebrate faunas differ within the Karoo, where the taxonomic composition of vertebrate assemblage zones (AZs) is mostly considered to be uniform. Although fossil material is known from across the outcrop of the Beaufort Group, the lowest Beaufort strata have received little attention, particularly north of S31°10′. Here, we report two fossil tetrapod assemblages from the lowest Beaufort Group in the southern Free State Province, which represent the northernmost point at which the lowest Beaufort has been targeted for collecting. The lower assemblage is characterized by an abundance of the small dicynodont Eosimops and can thus be attributed to the Tapinocephalus AZ (Guadalupian), but the absence of dinocephalian or pareiasaurian material is unlike contemporaneous assemblages found further south. This suggests that the Tapinocephalus AZ was not uniform across the entire basin and highlights that the abundance, distribution and taxonomic composition of Karoo biozones may vary more than currently appreciated. The upper assemblage, characterized by the dicynodonts Oudenodon, Aulacephalodon and Dinanomodon, is attributable to the upper Cistecephalus AZ to lower Daptocephalus AZ. The juxtaposition of the lower Tapinocephalus AZ and upper Cistecephalus\lower Daptocephalus AZ in the southern Free State implies a stratigraphic gap from the Middle to Late Permian of up to 6 million years.

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Section: Discussionmentioning

confidence: 90%

“…; Olroyd et al . ). This pattern, where more derived endothiodonts obtain a wider geographical distribution as one moves upwards stratigraphically, led Olroyd et al .…”

Section: Discussionmentioning

confidence: 97%

“…; Olroyd et al . ). It is also possible, however, that differences in biogeographic pattern are simply the result of an undersampled Guadalupian record (Olroyd et al .…”

Section: Discussionmentioning

confidence: 97%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

See 3 more Smart Citations

Vertebrate assemblages from the north-central Main Karoo Basin, South Africa, and their implications for mid-Permian biogeography

Groenewald

Day

Rubidge

2019

LET

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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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A new tusked cistecephalid dicynodont (Therapsida, Anomodontia) from the upper Permian upper Madumabisa Mudstone Formation, Luangwa Basin, Zambia

Angielczyk

Benoît

Rubidge

2019

Papers in Palaeontology

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New materials of the enigmatic dicynodontAbajudon kaayai(Therapsida, Anomodontia) from the lower Madumabisa Mudstone Formation, middle Permian of Zambia

Cited by 26 publications

References 57 publications

Vertebrate assemblages from the north-central Main Karoo Basin, South Africa, and their implications for mid-Permian biogeography

Vertebrate assemblages from the north-central Main Karoo Basin, South Africa, and their implications for mid-Permian biogeography

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

A new tusked cistecephalid dicynodont (Therapsida, Anomodontia) from the upper Permian upper Madumabisa Mudstone Formation, Luangwa Basin, Zambia

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