Middle Tertiary marsupials (Mammalia) from North America

Korth, William W.

doi:10.1017/s0022336000022952

Cited by 36 publications

(75 citation statements)

References 17 publications

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“…The Whistler Squat Quarry Herpetotherium lower molars also compare favorably in size with lower molars attributed to H. marsupium from the Uintan Swift Creek local fauna [29] and with Herpetotherium cf. H. marsupium from the Duchesnean Lac Pelletier local fauna [26], [27]. Nevertheless, TMM 41372-403 is also similar in size to lower molars attributed to the Bridgerian-Duchesnean species H. knighti and TMM 41372-239 is similar in size to lower molars attributed to the Wasatchian-Duchesnean species H. innominatum [2], [24], [26], [30], [31].…”

Section: Resultsmentioning

confidence: 99%

Geochronological and Taxonomic Revisions of the Middle Eocene Whistler Squat Quarry (Devil’s Graveyard Formation, Texas) and Implications for the Early Uintan in Trans-Pecos Texas

et al. 2014

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The Whistler Squat Quarry (TMM 41372) of the lower Devil’s Graveyard Formation in Trans-Pecos Texas is a middle Eocene fossil locality attributed to Uintan biochronological zone Ui1b. Specimens from the Whistler Squat Quarry were collected immediately above a volcanic tuff with prior K/Ar ages ranging from ∼47–50 Ma and below a tuff previously dated to ∼44 Ma. New 40Ar/39Ar analyses of both of the original tuff samples provide statistically indistinguishable ages of 44.88±0.04 Ma for the lower tuff and 45.04±0.10 Ma for the upper tuff. These dates are compatible with magnetically reversed sediments at the site attributable to C20r (43.505–45.942 Ma) and a stratigraphic position above a basalt dated to 46.80 Ma. Our reanalysis of mammalian specimens from the Whistler Squat Quarry and a stratigraphically equivalent locality significantly revises their faunal lists, confirms the early Uintan designation for the sites, and highlights several biogeographic and biochronological differences when compared to stratotypes in the Bridger and Uinta Formations. Previous suggestions of regional endemism in the early Uintan are supported by the recognition of six endemic taxa (26% of mammalian taxa) from the Whistler Squat Quarry alone, including three new taxa. The revised faunal list for the Whistler Squat Quarry also extends the biostratigraphic ranges of nine non-endemic mammalian taxa to Ui1b.

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Section: Resultsmentioning

confidence: 99%

Geochronological and Taxonomic Revisions of the Middle Eocene Whistler Squat Quarry (Devil’s Graveyard Formation, Texas) and Implications for the Early Uintan in Trans-Pecos Texas

et al. 2014

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“…The African species also differs significantly from North American herpetotheriids (Korth 1994) in the relative size and position of the stylar cusps (StB is small and more mesially placed in Herpetotherium and Copedelphys Korth, 1994, whereas StD is larger and progressively more mesially placed from M 1 to M 3 in these two taxa). Upper molars have less size difference between paracone and metacone and lower molars have the cristid obliqua less buccally situated.…”

Section: Comparisonsmentioning

confidence: 89%

The Origin of Afro‐arabian ‘Didelphimorph’ Marsupials

Hooker¹,

Sánchez‐Villagra²,

Goin³

et al. 2008

Palaeontology

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New specimens of Peratherium africanum from Early Oligocene deposits of the Fayum, Egypt, provide key information on the relationships of the species. These include the first maxilla to be found and two additional dentaries. The maxilla can be demonstrated to belong to the same species as the holotype dentary by study of the occlusal relationships of upper and lower molars. It can be shown by several synapomorphies that P. africanum is the sister species to European Bartonian-Rupelian Peratherium lavergnense. P. africanum therefore belongs to the 'didelphimorph' family Herpetotheriidae, not to the peradectimorph family Peradectidae. The genus Qatranitherium, previously erected for this species alone, is here synonymized with Peratherium. Comparison with 'didelphimorphian' taxa from early Paleogene deposits of South America suggests more remote relationships, indicating an origin for P. africanum by dispersal from Europe as originally envisaged. The more precise relationships deduced here help to constrain the time interval for dispersal to Afro-Arabia, probably during the earliest Oligocene sealevel low.

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“…This combination of features is characteristic of peradectids (i.e. Peradectinae sensu Korth 1994; but see below), of which Patene and Mayulestes may constitute a derived lineage of carnivorous or faunivorous feeding habits.…”

Section: Phylogenetic Analysismentioning

confidence: 98%

A reassessment of bunodont metatherians from the Paleogene of Itaboraí (Brazil): systematics and age of the Itaboraian SALMA

Oliveira¹,

Goin²

2011

Rev. bras. paleontol.

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-Early Paleogene metatherians with inflated, low cusps (bunodont dentition), such as Bobbschaefferia, Procaroloameghinia, Protodidelphis, Guggenheimia, and Zeusdelphys have been subject to different interpretations regarding their affinities. A phylogenetic study including these bunodont marsupials and other selected metatherians presented here leads to the recognition of the following taxonomic assignments: "Ameridelphia", Protodidelphidae: Carolocoutoia ferigoloi, Guggenheimia brasiliensis, G. crocheti sp. nov., Protodidelphis vanzolinii, P. mastodontoides (= Robertbutleria mastodontoidea), Periprotodidelphis bergqvisti gen. et sp. nov., and Zeusdelphys complicatus; Marsupialia, Didelphimorphia, Peradectoidea, Caroloameghiniidae: Procaroloameghinia pricei; Australidelphia, Polydolopimorphia, family indet.: Bobbschaefferia fluminensis and aff. Bobbschaefferia sp.. The phylogenetic analysis does not support a closer relationship between protodidelphids and living didelphids as well as between Guggenheimia and Mirandatherium. No closer relationship was found between Zeusdelphys with Minusculodelphis and Monodelphopsis. Procaroloameghinia is regarded as a peradectoid didelphimorphian with bunoid dentition convergent with, but without direct affinities to, protodidelphids or polydolopimorphians. Bobbschaefferia is regarded as a basal polydolopimorphian, even though the scarce evidence at hand prevents us from assign it to any particular family of the suborder Hatcheriformes. Correlation with stratigraphic, sedimentary and magmatic data from some of the best studied margin basins in SE Brazil, together with the systematic reassessment of bunodont metatherians from Itaboraí, suggest that the Itaboraian SALMA is latest Paleoceneearly Eocene in age. Itaboraian protodidelphids, sternbergiids and caroloameghiniids are also recorded in the Las Flores locality/ Formation (central Patagonia) and in the La Barda locality (northwestern Patagonia) during the latest Paleocene and early Eocene.Key words: Metatheria, "Ameridelphia", Australidelphia, Didelphimorphia, Eocene, chronostratigraphy. RESUMO -Metatérios do Paleógeno inicial com cúspides infladas e baixas (bunodontes) comoBobbschaefferia, Procaroloameghinia, Protodidelphis, Guggenheimia e Zeusdelphys têm sido objeto de diferentes interpretações sobre suas afinidades. Um estudo filogenético, incluindo esses marsupiais bunodontes, assim como outros metatérios selecionados, conduz ao reconhecimento das seguintes atribuições taxonômicas: "Ameridelphia", Protodidelphidae: Carolocoutoia ferigoloi, Guggenheimia brasiliensis, G. crocheti sp. nov., Protodidelphis vanzolinii, P. mastodontoides (= Robertbutleria mastodontoidea), Periprotodidelphis bergqvisti gen. et sp. nov. e Zeusdelphys complicatus; Marsupialia, Didelphimorphia, Peradectoidea, Caroloameghiniidae: Procaroloameghinia pricei; Australidelphia, Polydolopimorphia, fam. indet.: Bobbschaefferia fluminensis and aff. Bobbschaefferia sp.. A análise filogenética não fornece suporte a uma íntima relação entre protodid...

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Middle Tertiary marsupials (Mammalia) from North America

Cited by 36 publications

References 17 publications

Geochronological and Taxonomic Revisions of the Middle Eocene Whistler Squat Quarry (Devil’s Graveyard Formation, Texas) and Implications for the Early Uintan in Trans-Pecos Texas

Geochronological and Taxonomic Revisions of the Middle Eocene Whistler Squat Quarry (Devil’s Graveyard Formation, Texas) and Implications for the Early Uintan in Trans-Pecos Texas

The Origin of Afro‐arabian ‘Didelphimorph’ Marsupials

A reassessment of bunodont metatherians from the Paleogene of Itaboraí (Brazil): systematics and age of the Itaboraian SALMA

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