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Gordon, Cynthia L.

doi:10.1023/a:1025545023221

Cited by 60 publications

(24 citation statements)

References 25 publications

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“…This site occurs in the middle section of the Santa Lucía Formation, which has been referred to the early Palaeocene (Gayet et al 1992;Bonaparte et al 1993;Muizon 1998;Gelfo et al 2009;Woodburne et al 2014a, b). The late Palaeocene age proposed by Marshall et al (1997) and Sempere et al (1997) has been abundantly discussed and rejected by Muizon (1998) and Gelfo et al (2009). Th e Tiupampa beds are included in a single reversed magnetostratigraphic series (Sempere et al 1997).…”

Section: Systematic Palaeontologymentioning

confidence: 99%

“…The earliest undisputed sparassodonts are from the early Eocene of Itaboraí (Brazil) (Marshall 1981) and the latest ones are from the late Pliocene of Catamarca and Buenos Aires (Argentina) (Riggs 1934;Marshall 1976a;Goin & Pascual 1987). In the early 1980s, the discovery of the Tiupampa mammal fauna in the Bolivian Andes greatly extended the knowledge of the South American Cenozoic mammal fauna down to the earliest Palaeocene, approximately 65 Ma ago, one Ma after the end of the Cretaceous (Marshall et al 1983;Marshall & Muizon 1988;Muizon 1992;Gelfo et al 2009;Woodburne et al 2014a, b;Muizon et al 1983Muizon et al , 2015Goin et al 2016). The fauna of Tiupampa (Tiupampan SALMA) includes c. 15 taxa of Metatheria and 12 taxa of Eutheria.…”

Section: Introductionmentioning

confidence: 99%

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Allqokirus australis (Sparassodonta, Metatheria) from the early Palaeocene of Tiupampa (Bolivia) and the rise of the metatherian carnivorous radiation in South America

et al. 2018

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The present paper describes a disarticulated skull of Allqokirus australis Marshall & Muizon, 1988, a basal sparassodont (Metatheria, Mammalia) from the early Palaeocene (c. 65 Ma.) of Tiupampa (Bolivia). The specimen includes the rostrum and palate with right premaxilla, both maxillae, left lacrimal, palatines and most upper teeth. The second largest element includes the frontals, the left squamosal, the parietals, the supraoccipital, the basisphenoid, the presphenoid, the alisphenoid, and part of the pterygoids. The nasals, basioccipital and exoccipitals are missing. Other elements are the left petrosal, the right jugal and squamosal, and both dentaries. The elements of the specimen allow for a good reconstruction of the skull, which is thoroughly described and compared to that of other sparassodonts and to the Tiupampa pucadelphyids, Pucadelphys and Andinodelphys. The dental morphology of Allqokirus australis is extremely similar to that of Patene simpsoni from the early Eocene of Itaboraí (Brazil) and presents distinct (although incipient) carnivorous adaptations. Furthermore, some characters of the ear region (e.g. medial process of the squamosal, deep groove for the internal carotid artery at the ventral apex of the petrosal) are also present in most other sparassodonts and in the pucadelphyids from the same locality. A parsimony analysis performed on the basis of a data matrix of 364 characters and 38 taxa placed Allqokirus in a sparassodont clade (the Mayulestidae) that also included Mayulestes and Patene. This family constitutes the sister group of all other sparassodonts. Our analysis also retrieved a large clade composed of the sparassodonts and the pucadelphyids, formally named Pucadelphyda n. superord. This superorder represents the large metatherian carnivorous radiation of the Tertiary of South America, which is first known at Tiupampa, and which started to diversify probably slightly earlier, during the late Cretacous in South America. So far, no representative of Pucadelphyda has been discovered in North America. At Tiupampa, Allqokirus and Mayulestes are the largest metatherians of the fauna and they fill the predaceous mammalian ecological niche. They are the earliest representatives of Sparassodonta, a successful metatherian carnivorous radiation which persisted in South America until the late Pliocene, i.e., during more than 63 Ma.

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Section: Systematic Palaeontologymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Allqokirus australis (Sparassodonta, Metatheria) from the early Palaeocene of Tiupampa (Bolivia) and the rise of the metatherian carnivorous radiation in South America

et al. 2018

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“…Body mass. Body mass estimates (in g) were calculated for the species of Gaylordia following regression equations for upper and lower molars crown area by multiplying maximum length and maximum width (lengthxwidth) from two different datasets provided by Gordon (2003): the Didelphidae (Caluromys excluded) and pooled Didelphidae and Dasyuridae.…”

Section: Methodsmentioning

confidence: 99%

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

Oliveira¹,

Goin²

2015

Rev. bras. paleontol.

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-We describe a new metatherian of the genus Gaylordia Paula Couto, from the early Eocene Itaboraí Basin, Brazil. This new species (estimated body mass ~60-90.9 g) is based on lower and upper dentition elements and is characterized by a more plesiomorphic dental morphology with respect to G. macrocynodonta Paula Couto (with a larger body mass, estimated in ~74-103 g for large individuals or males). The species G. doelloi Marshall, represented by small individuals or females, is regarded a junior synonym of G. macrocynodonta. A phylogenetic analysis as well as details of the occlusal surface of its upper and lower molars suggests that Gaylordia is closely related to the Pucadelphyidae, a non-marsupial "ameridelphian" group previously recorded at the early Paleocene locality of Tiupampa, Bolivia.Key words: systematics, Paleogene, Mammalia, Metatheria, body mass, Brazil.RESUMO -Descreve-se um novo marsupial basal do gênero Gaylordia Paula Couto, do Eoceno inicial da bacia de Itaboraí, Brasil. Esta nova espécie (massa corporal estimada ~60-90.9 g) está baseada na dentição superior e inferior, e é caracterizada por uma morfologia dentária mais plesiomórfi ca em relação a G. macrocynodonta Paula Couto (cuja maior massa corporal é estimada em ~74-103 g para grandes indivíduos ou machos). A espécie G. doelloi Marshall, representada por indíviduos pequenos ou fêmeas, é considerada um sinônimo junior de G. macrocynodonta. Uma análise fi logenética, bem como detalhes da superfície oclusal de seus molares superiores e inferiores sugerem uma relação próxima de Gaylordia aos Pucadelphyidae, um grupo de ameridélfi os não marsupiais previamente registrados no Paleoceno inicial da localidade de Tiupampa, Bolivia.Palavras-chave: sistemática, Paleógeno, Mammalia, Metatheria, massa corporal, Brasil.

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“…Body mass estimates were calculated for Archaeonothos henkgodthelpi and other metatherian taxa discussed in the text (Table 1) using regression equations for upper molar dimensions from two different datasets: the "pooled Didelphidae and Dasyuridae" dataset of Gordon (2003: fig. 7), and the "all species" dataset (based on Australian marsupials only) of Myers (2001: table 2).…”

Section: Methodsmentioning

confidence: 99%

“…7), and the "all species" dataset (based on Australian marsupials only) of Myers (2001: table 2). The most accurate (as indicated by R 2 values) measurement available was used for each locus: for the Gordon (2003: fig. 7) dataset, this was L for M1, M2, and M3; for the Myers (2001: Archaeonothos henkgodthelpi sp.…”

Section: Methodsmentioning

confidence: 99%