A new species of Gaylordia Paula Couto (Mammalia, Metatheria) from Itaboraí, Brazil

Oliveira, Édison Vicente; Goin, Francisco J.

doi:10.4072/rbp.2015.1.07

Cited by 11 publications

(10 citation statements)

References 16 publications

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“…The second upper and lower premolars are more "blade-like" than the ones of Gaylordia (Oliveira & Goin, 2015).…”

Section: Morphology Of the Second And Third Premolarsmentioning

confidence: 94%

“…Gaylordia is considered one of the smallest species of Itaboraí, along with Minusculodelphis and Marmosopsis (Oliveira & Goin, 2015;Oliveira et al, 2016). In fact, the smaller size seems to be an evolutionary tendency of this group.…”

Section: Large Size Mesiodistal Compression Of M1 and Increasing In mentioning

confidence: 99%

“…These cusps are developed and visible even in worn teeth. The P1 of Didelphopsis (Paula Couto, 1962), Gaylordia (Oliveira & Goin, 2015), Szalinia (Muizon & Cifelli, 2001), Herpetotherium (Fox, 1983), Acyon (Forasiepi et al, 2006), Roberthoffstetteria (Muizon, 1992) and Lotheridium (Bi et al, 2015) do not present developed anterior and posterior cusps. Similar accessory cusps are also present on the upper premolars of Didelphidae and Sparassocynidae (Reig et al, 1987); however, the phylogenetic analysis did not recover these morphologies as homologous (228:1).…”

Section: Morphology Of First Premolarmentioning

confidence: 99%

“…In Gaylordia macrocynodonta the p3 and p2 are much more inflated and larger compared to the former, which represents an autapomorphy of this species. Gaylordia mater represents a mosaic condition between the basal Tiulordia and the specialized Gaylordia macrocynodonta (see Oliveira & Goin, 2015).…”

Section: Morphology Of the Second And Third Premolarsmentioning

confidence: 99%

“…Oliveira & Goin (2011) and Oliveira et al (2016) considered Gaylordia as closely related to Minusculodelphis and Marmosopsis. Oliveira & Goin (2015) thought of Gaylordia as closely related to Pucadelphyidae and Peradectidae, but did not include a jaskhadelphyid or a closely related taxon in their analysis. Goin (2003) suggested the inclusion of Didelphopsis, Itaboraidelphys and Carolopaulacoutoia in the family "Sternbergiidae" (McKenna & Bell, 1997); but this result was not supported by Oliveira & Goin (2011), and Oliveira et al (2016), that considered Didelphopsis as closely related to Itaboraidelphys as the sister lineage of Carolopaulacoutoia, Peratherium, Derorhynchus and Djarthia, refuting the validity of "Sternbergiidae".…”

Section: Introductionmentioning

confidence: 99%

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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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“…The second upper and lower premolars are more "blade-like" than the ones of Gaylordia (Oliveira & Goin, 2015).…”

Section: Morphology Of the Second And Third Premolarsmentioning

confidence: 94%

Section: Large Size Mesiodistal Compression Of M1 and Increasing In mentioning

confidence: 99%