Reassessing the affinities of vertebral remains from Permo-Triassic beds of Gondwana

Piñeiro, Graciela; Ferigolo, Jorge; Ribeiro, Ana María; Velozo, Pablo

doi:10.1016/j.crpv.2015.02.004

Cited by 15 publications

(2 citation statements)

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“…Jan. 21, 2022), which has recently been dated either as Lopingian (Ernesto et al, 2020) or late Guadalupian-early Lopingian (Piñeiro et al, in press). Such a long range extension in South America of a Euramerican Permo-Carboniferous taxon is not unprecedented: putative diadectomorph vertebrae were described (Piñeiro, et al, 2015 ) from the Late Permian or early Triassic Sanga do Cabral Formation (Brazil), and the Wuchiapingian (lower Lopingian or Late Permian) occurrence of diadectomorphs in China attests to a comparable record (Laurin, 2015;Liu and Bever, 2015).…”

Section: Rothianiscusmentioning

confidence: 80%

The age of North America’s youngest Paleozoic continental vertebrates: a review of data from the Middle Permian Pease River (Texas) and El Reno (Oklahoma) Groups

Laurin¹,

Hook²

2022

BSGF - Earth Sci. Bull.

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The youngest Paleozoic vertebrate-bearing continental deposits of North America are Middle Permian (Guadalupian) in age and occur in the Chickasha Formation (El Reno Group) of central Oklahoma and the lithostratigraphically lower San Angelo Formation (Pease River Group) of North-Central Texas. Although regarded originally as Guadalupian, these deposits have been assigned recently to the Early Permian on the basis of marine fossils and questionable lithostratigraphic extrapolations from marine to continental strata. A review of ammonoid genera recovered from the Blaine Formation, which overlies both the Chickasha and San Angelo in Oklahoma and Texas, shows that they range globally in age from the Early to Late Permian but most occur in the Guadalupian or Middle Permian. A modest but intensively studied paleobotanical record of compression fossils from the San Angelo, as well as palynomorphs in rocks associated with the Chickasha, presents an unquestionably Middle to Late Permian flora dominated by voltzian conifers. The Chickasha and San Angelo vertebrate assemblages are overwhelmingly dominated by large caseid synapsids and indicate a biostratigraphic signal of early Guadalupian. The occurrence of the tupilakosaurid temnospondyl Slaugenhopia, the parareptile Macroleter, and the eureptile Rothianiscus suggest a Roadian age (lowermost Guadalupian) given the global records of closely related forms. These plant and vertebrate assemblages contrast sharply with those of underlying Cisuralian rocks of the Hennessey Formation of Oklahoma and the Clear Fork Formation of Texas, both of which are much more fossiliferous than those of the Guadalupian in the region. A barren interval of up to 300 m in thickness separates these fossil-bearing intervals. This true void, first reported a half century ago by E.C. Olson, has not been recognized in recent biochronology studies. These findings, as well as those of other vertebrate paleontologists who have evaluated the San Angelo and Chickasha data by other means, strongly refute the notion of “Olson’s Gap” as currently entertained.

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Section: Rothianiscusmentioning

confidence: 80%

The age of North America’s youngest Paleozoic continental vertebrates: a review of data from the Middle Permian Pease River (Texas) and El Reno (Oklahoma) Groups

Laurin¹,

Hook²

2022

BSGF - Earth Sci. Bull.

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“…The new taxon is the first record of a diadectomorph outside North America or Germany and the first evidence that Diadectomorpha survived the Lower Permian. A possible diadectomorph was recently reported from the Upper Permian of Brazil; however, the poor preservation of the specimen does not support a clear diagnosis [6]. We explore the phylogenetically contextualized implications of this extralimital status for the geographical and stratigraphic dynamics of this important group.…”

Section: Introductionmentioning

confidence: 83%

The last diadectomorph sheds light on Late Palaeozoic tetrapod biogeography

Liu

Bever

2015

Biol. Lett.

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Diadectomorpha is a clade of Late Palaeozoic vertebrates widely recognized as the sister group of crown-group Amniota and the first tetrapod lineage to evolve high-fibre herbivory. Despite their evolutionary importance, diadectomorphs are restricted stratigraphically and geographically, with all records being from the Upper Carboniferous and Lower Permian of North America and Germany. We describe a new diadectomorph, Alveusdectes fenestralis, based on a partial skull from the Upper Permian of China. The new species exhibits the derived mechanism for herbivory and is recovered phylogenetically as a deeply nested diadectid. Approximately 16 Myr younger than any other diadectomorph, Alveusdectes is the product of at least a 46 Myr ghost lineage. How much of this time was probably spent in Russia and/or central Asia will remain unclear until a specimen is described that subdivides this cryptic history, but the lineage assuredly crossed this region before entering the relatively isolated continent of North China. The discovery of Alveusdectes raises important questions regarding diadectomorph extinction dynamics including what, if any, ecological factors limited the diversity of this group in eastern Pangea. It also suggests that increased sampling in Asia will likely significantly affect our views of clade and faunal insularity leading up to the Permo-Triassic extinction.

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