A Late Cretaceous taeniodont (Eutheria, Mammalia) from Alberta, Canada

Fox, Richard C.; Naylor, Bruce G.

doi:10.1127/njgpa/229/2003/393

Cited by 22 publications

(29 citation statements)

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“…This construction also is known in Dakotadens and Iugomortiferum, but in a less advanced way, and most probably as a parallelism. Crushing molars with developed ''horizontal wear'' (abrasion) is considered by Fox and Naylor (16) to be a distinctive feature of early ''marsupials'' (i.e., stem marsupialiforms) with respect to other therian mammals. In A. marchandi, the crushing function associated with a large and inflated protocone with wear facet 9 is a noteworthy early specialization, possibly corresponding to an autapomorphy of the European lineage illustrated by Arcantiodelphys.…”

Section: Cch1 (Figs 2a and S2 A-d)mentioning

confidence: 99%

The oldest modern therian mammal from Europe and its bearing on stem marsupial paleobiogeography

Vullo

Gheerbrant

Muizon

et al. 2009

Proc. Natl. Acad. Sci. U.S.A.

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We report the discovery of mammalian tribosphenic teeth from the basal Cenomanian of southwestern France that we refer to a new primitive marsupial-like form identified as a basal taxon of Marsupialiformes, a new clade recognized here to include the crown group Marsupialia and primitive stem lineages more closely related to Marsupialia than to Deltatheroida. Arcantiodelphys marchandi gen et sp nov. shares several significant marsupial-like features ( s.l. ) with marsupialiform taxa known from the North American Mid-Cretaceous. Among marsupialiforms, it shows a closer resemblance to Dakotadens . This resemblance, which is plesiomorphic within “tribotherians,” makes Arcantiodelphys one of the most archaic known Marsupialiformes. Moreover, Arcantiodelphys is characterized by an original and precocious crushing specialization. Both the plesiomorphic and autapomorphic characteristics of Arcantiodelphys among Marsupialiformes might be explained by an Eastern origin from Asian stem metatherians, with some in situ European evolution. In addition, the presence of a mammal with North American affinities in western Europe during the early Late Cretaceous provides further evidence of a large Euramerican biogeographical province at this age or slightly before. Concerning the paleobiogeographical history of the first stem marsupialiforms during the Albian–Cenomanian interval, 2 possible dispersal routes from an Asian metatherian ancestry can be proposed: Asia to Europe via North America and Asia to North America via Europe. The main significance of the Archingeay-Les Nouillers mammal discovery is that it indicates that the beginning of the stem marsupialiforms history involved not only North America but also Europe, and that this early history in Europe remains virtually unknown.

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Section: Cch1 (Figs 2a and S2 A-d)mentioning

confidence: 99%

The oldest modern therian mammal from Europe and its bearing on stem marsupial paleobiogeography

Vullo

Gheerbrant

Muizon

et al. 2009

Proc. Natl. Acad. Sci. U.S.A.

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“…So far, taeniodonts have only been found in North America, centered in the western United States and Canada. The group appeared during the Late Cretaceous with the occurrence of Schowalteria in Alberta, Canada (Fox and Naylor, 2003). The group finally went extinct with Stylinodon, which is last known from the Uintan North American Land Mammal Age (NALMA; see Woodburne, 2003, for the North American mammalian biochronological zonation) (middle Eocene) Turnbull, 2004).…”

Section: Introductionmentioning

confidence: 98%

“…estimated the body mass of Psittacotherium at 36-71 kg based on skull and body length, which was larger than Wortmania (the largest Puercan-age taeniodont) at 14-29 kg. The Taeniodonta have been considered part of the great diversification of mammals following the mass extinction at the end of the Cretaceous, which ended the reign of the dinosaurs (Fox and Naylor, 2003).…”

Section: Introductionmentioning

confidence: 99%

Phylogeny of the Taeniodonta: evidence from dental characters and stratigraphy

Rook

Hunter

2011

Journal of Vertebrate Paleontology

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“…Disparity continues to increase during the late Late Cretaceous (K6 and K7) with the appearance of taxa with molars indicating plant-dominated diets (e.g. [22]) and carnivory (e.g. [23]).…”

Section: (B) Ecomorphological Diversification During the Late Cretaceousmentioning

confidence: 99%

“…For instance, recent studies demonstrate that end-Cretaceous therians achieved greater ecomorphological diversity than previously realized [22][23][24][25][26], and mammals began a trend of increasing average body size 10-20 Myr before the K-Pg boundary [13,15,27]. Multituberculates, a diverse clade of extinct non-therian mammals, experienced a Late Cretaceous radiation that included increases in dietary, morphological, and taxonomic diversities [13,15].…”

Section: Introductionmentioning

confidence: 99%

Therian mammals experience an ecomorphological radiation during the Late Cretaceous and selective extinction at the K–Pg boundary

2016

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It is often postulated that mammalian diversity was suppressed during the Mesozoic Era and increased rapidly after the Cretaceous-Palaeogene (KPg) extinction event. We test this hypothesis by examining macroevolutionary patterns in early therian mammals, the group that gave rise to modern placentals and marsupials. We assess morphological disparity and dietary trends using morphometric analyses of lower molars, and we evaluate generic level taxonomic diversity patterns using techniques that account for sampling biases. In contrast with the suppression hypothesis, our results suggest that an ecomorphological diversification of therians began 10-20 Myr prior to the K-Pg extinction event, led by disparate metatherians and Eurasian faunas. This diversification is concurrent with ecomorphological radiations of multituberculate mammals and flowering plants, suggesting that mammals as a whole benefitted from the ecological rise of angiosperms. In further contrast with the suppression hypothesis, therian disparity decreased immediately after the K-Pg boundary, probably due to selective extinction against ecological specialists and metatherians. However, taxonomic diversity trends appear to have been decoupled from disparity patterns, remaining low in the Cretaceous and substantially increasing immediately after the K-Pg extinction event. The conflicting diversity and disparity patterns suggest that earliest Palaeocene extinction survivors, especially eutherian dietary generalists, underwent rapid taxonomic diversification without considerable morphological diversification.

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A Late Cretaceous taeniodont (Eutheria, Mammalia) from Alberta, Canada

Cited by 22 publications

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The oldest modern therian mammal from Europe and its bearing on stem marsupial paleobiogeography

The oldest modern therian mammal from Europe and its bearing on stem marsupial paleobiogeography

Phylogeny of the Taeniodonta: evidence from dental characters and stratigraphy

Therian mammals experience an ecomorphological radiation during the Late Cretaceous and selective extinction at the K–Pg boundary

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