Earliest Divergence of Stagodontid (Mammalia: Marsupialiformes) Feeding Strategies from the Late Cretaceous (Turonian) of North America

Cohen, Joshua E.

doi:10.1007/s10914-017-9382-0

Cited by 9 publications

(17 citation statements)

References 38 publications

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“…This result does not support Cohen (2017), who considered Hoodootherium as the sister taxon of Eodelphis and Fumodelphodon as the sister taxon of Didelphodon. The validity of "Eobrasiliinae" was not supported in the analysis, as Gaylordia + Tiulordia constitutes a monophyletic lineage more closely related to Jaskhadelphyidae Muizon, 1992.…”

Section: Phylogenetic Analysiscontrasting

confidence: 80%

“…Currently represented by Eodelphis Matthew, 1916, Didelphodon, Hoodootherium Cohen, 2017, and Fumodelphodon Cohen, 2017, this lineage is characterized by the presence of inflated premolars, stout dentary, large size and lower molars with an enlarged paraconid (Clemens, 1966;Fox, 1981;Cohen, 2017). Pariadens is an enigmatic taxon with possible stagodontid affinities, following previous studies (Cifelli & Eaton, 1987;Cifelli, 2004;Eaton, 1993a;Williamson et al, 2012Williamson et al, , 2014Wilson et al, 2016).…”

Section: Introductionmentioning

confidence: 81%

“…Most of these characters are also present in Malleodectes (Arena et al, 2011;Archer et al, 2016) and Didelphodon . Based on available evidence, stagodontids should be considered as carnivorousdurophagous taxa, as proposed by Wilson et al (2016) and Cohen (2017). The Turonian Fumodelphodon and the late Campanian-Maastrichtian Didelphodon independently acquired durophagous adaptations (e.g.…”

Section: Paleoecological Implicationsmentioning

confidence: 99%

“…Pariadens is known from the Cenomanian, representing one of the oldest metatherians of North America (Cifelli & Eaton, 1987;Cifelli, 2004;Eaton, 1993a;Williamson et al, 2012Williamson et al, , 2014. The oldest confirmed record of a stagodontid is the Smoky Hollow Member of the Straight Cliffs Formation (Turonian), southern Utah, with Hoodootherium and Fumodelphodon (Cohen, 2017). The presence of a stagodontid in the Smoky Hollow Member of the Straight Cliffs Formation (Turonian) was firstly proposed by Cifelli (1990).…”

Section: Introductionmentioning

confidence: 98%

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Systematic affinities of the extinct metatherian Eobrasilia coutoi Simpson, 1947, a South American Early Eocene Stagodontidae: implications for "Eobrasiliinae"

Carneiro¹,

Oliveira²

2017

Rev. bras. paleontol.

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-Eobrasilia coutoiSimpson is currently considered one of the most enigmatic metatherian mammals of Itaboraí Basin, Brazil. A single badly broken and incomplete skull, with a single strongly worn M3, and an associated fragmentary dentary are the elements currently attributed to this taxon. This fragmentary condition contributes for its uncertain position within Metatheria. Herein, the preserved dental morphology of this species is re-analyzed. The morphology of these structures, such as a tiny, obliquely oriented, one-rooted P1; absence of retro-premolar spaces between the premolars and mesiodistally developed p3, supports the assignment of Eobrasilia as a South American stagodontid. This new result leads a systematic review of the affinities of "Eobrasiliinae", currently represented by Eobrasilia, Gaylordia and Didelphopsis. The hypothesis that "Eobrasiliinae" represents a valid taxon is refuted in the phylogenetic analysis, which recovered Eobrasilia as more closely related to Didelphodon within Stagodontidae, Gaylordia as the sister taxon of Tiulordia and more closely related to Minusculodelphis and Marmosopsis, and Didelphopsis as the sister taxon of Itaboraidelphys and more closely related to Herpetotherium, Carolopaulacoutoia and Derorhynchus. The shared characters between Eobrasilia, Gaylordia and Didelphopsis were likely a result of convergent evolution, as these three lineages independently adapted to more durophagous diets. The phylogenetic analysis did not support the sister relation between Fumodelphodon and Didelphodon and Eodelphis and Hoodootherium. The grouping of Eobrasilia and Didelphodon corroborates the previous hypothesis that Metatheria dispersed from North to South America during the Late Cretaceous.Key words: Early Eocene, Eobrasilia, "Eobrasiliinae", Itaboraí, Stagodontidae, systematics. RESUMO -Eobrasilia coutoiSimpson é considerado atualmente como um dos metatérios mais enigmáticos da Bacia de Itaboraí, Brasil. Um crânio muito fragmentado e incompleto com um M3 muito desgastado, e um dentário fragmentado são os únicos elementos atribuídos a esse táxon. Essa "fragmentação" dos materiais associados ao gênero Eobrasilia contribui para a sua posição incerta dentro do clado dos Metatheria. Aqui, a morfologia dentária preservada dessa espécie é reanalisada. A presença de um P1 pequeno, com uma orientação oblíqua em relação aos P2-3 e com uma única raiz; ausência de espaços retro-premolares entre os pré-molares e o evidente desenvolvimento mesiodistal do p3 suportam a associação de Eobrasilia como um stagodontídeo sul-americano. Esse novo resultado levou a uma revisão sistemática das afinidades dos "Eobrasiliinae", previamente representado por Eobrasilia, Gaylordia e Didelphopsis. A hipótese de que "Eobrasiliinae" representa um táxon válido é refutada pela análise filogenética, que recuperou Eobrasilia como grupo-irmão de Didelphodon e pertencente à família Stagodontidae; Gaylordia como táxon irmão de Tiulordia, sendo ambos mais próximos filogeneticamente de Minusculodelphis e Marmoso...

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Section: Phylogenetic Analysiscontrasting

confidence: 80%

Section: Introductionmentioning

confidence: 81%

Section: Paleoecological Implicationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

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Systematic affinities of the extinct metatherian Eobrasilia coutoi Simpson, 1947, a South American Early Eocene Stagodontidae: implications for "Eobrasiliinae"

Carneiro¹,

Oliveira²

2017

Rev. bras. paleontol.

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“…In order to determine whether jaw shape could be used as a dietary proxy in Mesozoic mammals, we obtained previous independent determinations of likely diets, which variously employed dental morphology, tooth wear facets and body size (e.g., see refs. 1 , 7 , 12 , 14 , 24 – 32 ). We saw a very good correspondence between previous proposed diets for Mesozoic mammals and their position on the morphospace.…”

Section: Resultsmentioning

confidence: 99%

Jaw shape and mechanical advantage are indicative of diet in Mesozoic mammals

et al. 2021

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Jaw morphology is closely linked to both diet and biomechanical performance, and jaws are one of the most common Mesozoic mammal fossil elements. Knowledge of the dietary and functional diversity of early mammals informs on the ecological structure of palaeocommunities throughout the longest era of mammalian evolution: the Mesozoic. Here, we analyse how jaw shape and mechanical advantage of the masseter (MAM) and temporalis (MAT) muscles relate to diet in 70 extant and 45 extinct mammals spanning the Late Triassic-Late Cretaceous. In extant mammals, jaw shape discriminates well between dietary groups: insectivores have long jaws, carnivores intermediate to short jaws, and herbivores have short jaws. Insectivores have low MAM and MAT, carnivores have low MAM and high MAT, and herbivores have high MAM and MAT. These traits are also informative of diet among Mesozoic mammals (based on previous independent determinations of diet) and set the basis for future ecomorphological studies.

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Diversity and Phylogeny of Marsupials and Their Stem Relatives (Metatheria)

Beck

2023

American and Australasian Marsupials

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Earliest Divergence of Stagodontid (Mammalia: Marsupialiformes) Feeding Strategies from the Late Cretaceous (Turonian) of North America

Cited by 9 publications

References 38 publications

Systematic affinities of the extinct metatherian Eobrasilia coutoi Simpson, 1947, a South American Early Eocene Stagodontidae: implications for "Eobrasiliinae"

Systematic affinities of the extinct metatherian Eobrasilia coutoi Simpson, 1947, a South American Early Eocene Stagodontidae: implications for "Eobrasiliinae"

Jaw shape and mechanical advantage are indicative of diet in Mesozoic mammals

Diversity and Phylogeny of Marsupials and Their Stem Relatives (Metatheria)

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