Geologically Oldest Pediomyoidea (Mammalia, Marsupialiformes) from the Late Cretaceous of North America, with Implications for Taxonomy and Diet of Earliest Late Cretaceous Mammals

Cohen, Joshua E.; Davis, Brian M.; Cifelli, Richard L.

doi:10.1080/02724634.2020.1835935

Cited by 7 publications

(13 citation statements)

References 28 publications

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“…In that case, it is noteworthy that Glasbius is the only possible marsupial out of the remarkable diversity of Maastrichtian, Campanian and in some cases yet earlier metatherians known from North America and to a lesser degree central Asia. Rather than the beginning of the Maastrichtian, I propose the beginning of deposition of the Lance and Hell Creek formations, where Glasbius has been found, as the hard maximum age for this calibration, which I estimate as 68 Ma -though the single tooth from the Williams Fork Fm that Cohen et al (2020b) referred to Glasbius may be up to 2 Ma older.…”

Section: Node 157: Marsupialia (Didelphimorphia -Paucituberculata + Amentioning

confidence: 91%

“…Kangas et al, 2004;Harjunmaa et al, 2014;Celik and Phillips, 2020). Indeed, Cohen et al (2020b) found Glasbius on the metatherian stem; however, although they discussed this result, they did not cite Carneiro (2017) or Carneiro and Oliveira (2017). Their analysis also failed to find the two included australidelphian taxa as sister-groups despite the morphological and molecular consensus (see Eldridge et al, 2019), but the bootstrap support for this was low.…”

Section: Node 157: Marsupialia (Didelphimorphia -Paucituberculata + Amentioning

confidence: 97%

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The making of calibration sausage exemplified by recalibrating the transcriptomic timetree of jawed vertebrates

Marjanović

2019

Preprint

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9Molecular divergence dating has the potential to overcome the incompleteness of the fossil record in 10 inferring when cladogenetic events (splits, divergences) happened, but needs to be calibrated by the 11 fossil record. Ideally but unrealistically, this would require practitioners to be specialists in molecular 12 evolution, in the phylogeny and the fossil record of all sampled taxa, and in the chronostratigraphy of 13 the sites the fossils were found in. Paleontologists have therefore tried to help by publishing 14 compendia of recommended calibrations, and molecular biologists unfamiliar with the fossil record 15have made heavy use of such works. Using a recent example of a large timetree inferred from 16 molecular data, I demonstrate that calibration dates cannot be taken from published compendia 17 without risking strong distortions to the results, because compendia become outdated faster than they 18 are published. The present work cannot serve as such a compendium either; in the slightly longer 19 term, it can only highlight known and overlooked problems. Future authors will need to solve each of 20 these problems anew through a thorough search of the primary paleobiological and 21 chronostratigraphic literature on each calibration date every time they infer a new timetree; over 40% 22 of the sources I cite were published after mid-2016. 23 Treating all calibrations as soft bounds results in younger nodes than treating all calibrations as hard 24bounds. The unexpected exception are nodes calibrated with both minimum and maximum ages, 25 further demonstrating the widely underestimated importance of maximum ages in divergence dating. 26

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Section: Node 157: Marsupialia (Didelphimorphia -Paucituberculata + Amentioning

confidence: 91%

Section: Node 157: Marsupialia (Didelphimorphia -Paucituberculata + Amentioning

confidence: 97%

The making of calibration sausage exemplified by recalibrating the transcriptomic timetree of jawed vertebrates

Marjanović

2019

Preprint

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“…However, this is almost certainly highly conservative, as the oldest convincing records of Placentalia are from the earliest Palaeocene (e.g., Purgatorius mckeeveri; Wilson Mantilla et al, 2021) or very slightly before (e.g., the latest Cretaceous Protungulatum coombsi; Archibald et al, 2011). The putative leptictidan Gypsonictops is known from the Late Cretaceous (Campanian-Maastrichtian; Kielan-Jaworowska et al, 2004) but has also been reported from much older, Turonian deposits (Cohen and Cifelli, 2015), although this material remains to be formally published; if Gypsonictops is indeed a leptictidan, and if leptictidans are crown clade placentals, then this would push the origin of Placentalia considerably earlier than the K-Pg boundary. However, this remains uncertain (see Springer et al, 2019;Marjanović, 2021), and the recent study by Velazco et al (2022) found leptictidans (including Gypsonictops) to fall outside Placentalia.…”

Section: Phylogenetic Justificationmentioning

confidence: 99%

Twenty-five well-justified fossil calibrations for primate divergences

Vries

Beck

2023

Palaeontol Electron

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Phylogenies with estimates of divergence times are essential for investigating many evolutionary questions. In principle, "tip-dating" is arguably the most appropriate approach, with fossil and extant taxa analysed together in a single analysis, and topology and divergence times estimated simultaneously. However, "node-dating" (as used in many molecular clock analyses), in which fossil evidence is used to calibrate the age of particular nodes a priori, will probably remain the dominant approach, due to various issues with analysing morphological and molecular data together. Here, we provide a list of 25 well-justified node calibrations for primate divergences, following best practices: 16 within Haplorhini, four within Strepsirrhini, one for crown Primates, and four for older divergences within Euarchontoglires. In each case, we provide a hard minimum bound, and for 22 of these we also provide a soft maximum bound and a suggested prior distribution. For each calibrated node, we provide the age of the oldest fossil of each daughter lineage that descends from it, which allows use of the "CladeAge" method for specifying priors on node ages.

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“…To increase our taxonomic sampling of Cretaceous metatherians, we substituted the M2 (which tends to be morphologically very similar to the M3) for some species that did not have an available M3, and we used upper molar specimens of uncertain position (i.e., "Mx") for some species that did not have definitive M2 or M3 specimens available (see Table 3 for details). Our sample includes 62% of the known species of NALK metatherians (42 of 68 known species; Case et al, 2005;Williamson et al, 2014;Cohen, 2018;Cohen et al, 2020). Some species were omitted from our sample because of either a lack of a well-preserved upper molar in the fossil record or an appropriate specimen was not available for loan.…”

Section: Fossil Metatherian Samplingmentioning

confidence: 99%

Dental ecomorphology and macroevolutionary patterns of North American Late Cretaceous metatherians

Brannick,

Fulghum,

Grossnickle

et al. 2023

Palaeontol Electron

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Metatherian mammals were taxonomically rich and abundant in Late Cretaceous faunas of North America. Although much attention has been paid to metatherian taxonomy, a comprehensive, quantitative study on the ecomorphology of this clade is lacking. Here, we predict the diets of a large sample of metatherians using threedimensional dental topographic analysis, with the aim to better understand macroevolutionary patterns in dental morphology and dietary diversity. Contrary to their taxonomic diversity patterns, our results show that dental disparity and dietary diversity did not significantly change throughout the Late Cretaceous and that most metatherians were invertivorous (diets of insects and soft-bodied invertebrates). Nevertheless, we also found that metatherians occupied a wide range of dietary niches and were arguably the most dietarily diverse of any mammalian clade of the Late Cretaceous. Regarding the timing of metatherian ecomorphological diversification, our results indicate that it began by the mid-Cretaceous in-step with the Cretaceous Terrestrial Revolution and the taxonomic diversification of angiosperms, prior to the ecological diversifications of multituberculates and eutherians that began in the latest Cretaceous and Paleocene.

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Geologically Oldest Pediomyoidea (Mammalia, Marsupialiformes) from the Late Cretaceous of North America, with Implications for Taxonomy and Diet of Earliest Late Cretaceous Mammals

Cited by 7 publications

References 28 publications

The making of calibration sausage exemplified by recalibrating the transcriptomic timetree of jawed vertebrates

The making of calibration sausage exemplified by recalibrating the transcriptomic timetree of jawed vertebrates

Twenty-five well-justified fossil calibrations for primate divergences

Dental ecomorphology and macroevolutionary patterns of North American Late Cretaceous metatherians

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