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

Kammerer, Christian F.; Bandyopadhyay, Sanghamitra; Ray, Sanghamitra

doi:10.1002/spp2.1055

Cited by 23 publications

(44 citation statements)

References 34 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…; Kammerer et al . ) and among small dicynodonts, emydopoids are particularly noteworthy for their broad geographical ranges. For example, the emydopoid genera Compsodon , Dicynodontoides, Emydops , Kombuisia and Myosaurus are all known to occur in multiple geographically‐separated basins (e.g.…”

Section: Discussionmentioning

confidence: 99%

“…; Laaß ; Kammerer et al . ). Emydopoids also were geographically widespread, occurring in most major fossiliferous Permo‐Triassic basins in Gondwana (Fröbisch ), and they are one of only two major clades of dicynodonts to survive the Permo‐Triassic mass extinction (Cluver ; Hotton ; Fröbisch ; Fröbisch et al .…”

Section: Institutional Abbreviationsmentioning

confidence: 97%

“…A postfrontal also is present in Emydops (Fröbisch & Reisz ) but it is absent in Digalodon , Dicynodontoides , Kombuisia , Myosaurus , Cistecephalus , Cistecephaloides , Sauroscaptor and Kawingasaurus (Cox , ; Keyser ; Cluver , b; Fröbisch ; Kammerer et al . , ).…”

Section: Systematic Palaeontologymentioning

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

Section: Discussionmentioning

confidence: 99%

Section: Institutional Abbreviationsmentioning

confidence: 97%

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

“…The fauna is dominated by small, medium and large sized dicynodonts (85.5%), followed by gorgonopsians (9.7%) and captorhinids (4.8%) (Kutty, 1972;Ray, 2000Ray, , 2001Ray and Bandyopadhyay, 2003;Kammerer et al, 2016). The recent recognition that specimens previously referred to Emydops and Cistecephalus actually represent a new cistecephalid genus (Sauroscaptor tharavati; Kammerer et al, 2016), has increased the level of endemism displayed by the Kundaram Formation assemblage.…”

Section: Indiamentioning

confidence: 99%

“…The recent recognition that specimens previously referred to Emydops and Cistecephalus actually represent a new cistecephalid genus (Sauroscaptor tharavati; Kammerer et al, 2016), has increased the level of endemism displayed by the Kundaram Formation assemblage. A correlation with the Tropidostoma and Cistecephalus Assemblage Zones of the Karoo Basin (Fröbisch, 2009;Kurkin, 2011) has been proposed, albeit most of the taxa in the assemblage are either endemic or stratigraphically long-ranging in the Karoo, making an exact correlation difficult.…”

Section: Indiamentioning

confidence: 99%

Late Permian (Lopingian) Terrestrial Ecosystems: A Global Comparison With New Data From the Low Latitude Bletterbach Biota

Petti¹,

Bernardi²,

Kustatscher³

et al. 2017

Geological Society of America Abstracts With Programs

View full text Add to dashboard Cite

Keywords:Tetrapoda flora phytoprovinces plant-insect interactions climate endemism latitudinal diversity gradient A B S T R A C TThe late Palaeozoic is a pivotal period for the evolution of terrestrial ecosystems. Generalised warming and aridification trends resulted in profound floral and faunal turnover as well as increased levels of endemism. The patchiness of well-preserved, late Permian terrestrial ecosystems, however, complicates attempts to reconstruct a coherent, global scenario. In this paper, we provide a new reconstruction of the Bletterbach Biota (Southern Alps, NE Italy), which constitutes a unique, low-latitude record of Lopingian life on land. We also integrate floral, faunal (from skeletal and footprint studies), and plant-insect interaction data, as well as global climatic interpretations, to compare the composition of the 14 best-known late Permian ecosystems. The results of this ecosystem-scale analysis provide evidence for a strong correlation between the distribution of the principal clades of tetrapod herbivores (dicynodonts, pareiasaurs, captorhinids), phytoprovinces and climatic latitudinal zonation. We show that terrestrial ecosystems were structured and provincialised at high taxonomic levels by climate regions, and that latitudinal distribution is a key predictor of ecosystem compositional affinity. A latitudinal diversity gradient characterised by decreasing richness towards higher latitudes is apparent: mid-to lowlatitude ecosystems had the greatest amount of high-level taxonomic diversity, whereas those from high latitudes were dominated by small numbers of higher taxa. The high diversities of tropical ecosystems stem from their inclusion of a mixture of late-occurring holdovers from the early Permian, early members of clades that come to prominence in the Triassic, and contemporary taxa that are also represented in higher latitude assemblages. A variety of evidence suggests that the Permian tropics acted as both a cradle (an area with high origination rates) and museum (an area with low extinction rates) for biodiversity.

show abstract

Evidence for convergent evolution of a neocortex‐like structure in a late Permian therapsid

Laaß

Kaestner

2017

Journal of Morphology

View full text Add to dashboard Cite

The special sensory, motor, and cognitive capabilities of mammals mainly depend upon the neocortex, which is the six-layered cover of the mammalian forebrain. The origin of the neocortex is still controversial and the current view is that larger brains with neocortex first evolved in late Triassic Mammaliaformes. Here, we report the earliest evidence of a structure analogous to the mammalian neocortex in a forerunner of mammals, the fossorial anomodont Kawingasaurus fossilis from the late Permian of Tanzania. The endocranial cavity of Kawingasaurus is almost completely ossified, which allowed a less hypothetical virtual reconstruction of the brain endocast to be generated. A parietal foramen is absent. A small pit between the cerebral hemispheres is interpreted as a pineal body. The inflated cerebral hemispheres are demarcated from each other by a median sulcus and by a possible rhinal fissure from the rest of the endocast. The encephalization quotient estimated by using the method of Eisenberg is 0.52, which is 2-3 times larger than in other nonmammalian synapsids. Another remarkable feature are the extremely ramified infraorbital canals in the snout. The shape of the brain endocast, the extremely ramified maxillary canals as well as the small frontally placed eyes suggest that special sensory adaptations to the subterranean habitat such as a well developed sense of touch and binocular vision may have driven the parallel evolution of an equivalent of the mammalian neocortex and a mammal-like lemnothalamic visual system in Kawingasaurus. The gross anatomy of the brain endocast of Kawingasaurus supports the Outgroup Hypothesis, according to which the neocortex evolved from the dorsal pallium of an amphibian-like ancestor, which receives sensory projections from the lemnothalamic pathway. The enlarged brain as well as the absence of a parietal foramen may be an indication for a higher metabolic rate of Kawingasaurus compared to other nonmammalian synapsids.

show abstract

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

Cited by 23 publications

References 34 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)

Late Permian (Lopingian) Terrestrial Ecosystems: A Global Comparison With New Data From the Low Latitude Bletterbach Biota

Evidence for convergent evolution of a neocortex‐like structure in a late Permian therapsid

Contact Info

Product

Resources

About