Early mammalian social behaviour revealed by multituberculates from a dinosaur nesting site

  title={Early mammalian social behaviour revealed by multituberculates from a dinosaur nesting site},
  author={Lucas N. Weaver and David J. Varricchio and Eric J. Sargis and Meng Chen and William J. Freimuth and Gregory P. Wilson Mantilla},
  journal={Nature Ecology \& Evolution},
When sociality evolved and in which groups remain open questions in mammalian evolution, largely due to the fragmentary Mesozoic mammal fossil record. Nevertheless, exceptionally preserved fossils collected in well-constrained geologic and spatial frameworks can provide glimpses into these more fleeting aspects of early mammalian behaviour. Here we report on exceptional specimens of a multituberculate, Filikomys primaevus gen. nov., from the Late Cretaceous of Montana, primarily occurring as… 
Spatial and Temporal Distribution of the Island-Dwelling Kogaionidae (Mammalia, Multituberculata) in the Uppermost Cretaceous of Transylvania (Western Romania)
ABSTRACT The latest Cretaceous kogaionid multituberculates from Transylvania (western Romania) were part of an endemic European clade of mammals that underwent an insular radiation at the end of the
Mammal‐bearing gastric pellets potentially attributable to Troodon formosus at the Cretaceous Egg Mountain locality, Two Medicine Formation, Montana, USA
Fossil gastric pellets (regurgitalites) have distinct taphonomic characteristics that facilitate inferences of behavioural ecology in deep time, despite their rarity in the fossil record. Using the
A New Mammal Skull from the Late Cretaceous of Romania and Phylogenetic Affinities of Kogaionid Multituberculates
Despite their Maastrichtian age, the very simple and conservative dental morphology of these Romanian kogaionids suggests that they originated from an eobaatarid-like ancestor dispersing from Asia or possibly already existing in Europe between the Barremian and Albian, 40 to 55 Ma earlier.
Second specimen of Corriebaatar marywaltersae from the Lower Cretaceous of Australia confirms its multituberculate affinities
A second specimen of the Australian cimolodontan multituberculate Corriebaatar marywaltersae from the same locality (Flat Rocks) as the holotype and previously only known specimen, reveals far more
Functional diversity of small-mammal postcrania is linked to both substrate preference and body size
The Divergence Hypothesis is tested by using phylogenetic comparative methods to examine the postcranial skeletons of 129 species of taxonomically diverse, small-to-medium-sized mammals, and a more pronounced pattern emerges that is distinct from the predictions of DH: within-group phenotypic disparity increases with body size in both ground-dwellers and tree-d Dwellers.
Abstract: The terrestrial feeding trace Edaphichnium lumbricatum is known from the Triassic to the Pleistocene and is characterized by tubular burrows with ellipsoidal fecal pellets, indicating
New Skull Material of Taeniolabis taoensis (Multituberculata, Taeniolabididae) from the Early Paleocene (Danian) of the Denver Basin, Colorado
Taeniolabis taoensis is an iconic multituberculate mammal of early Paleocene (Puercan 3) age from the Western Interior of North America. Here we report the discovery of significant new skull material
Ecological selectivity and the evolution of mammalian substrate preference across the K–Pg boundary
Abstract The Cretaceous–Paleogene (K–Pg) mass extinction 66 million years ago was characterized by a worldwide ecological catastrophe and rapid species turnover. Large‐scale devastation of forested
What Behavioral Abilities Emerged at Key Milestones in Human Brain Evolution? 13 Hypotheses on the 600-Million-Year Phylogenetic History of Human Intelligence
  • Max Bennett
  • Biology, Psychology
    Frontiers in Psychology
  • 2021
This paper presents 13 hypotheses regarding the specific behavioral abilities that emerged at key milestones during the 600-million-year phylogenetic history from early bilaterians to extant humans.
Incentive disengagement and the adaptive significance of frustrative nonreward
This article explores a specific adaptive function hypothesis of frustrative nonreward called the incentive disengagement hypothesis, which is to break an attachment to a site, situation, or stimulus that no longer yields appetitive resources to promote the search for rewards in alternative locations.


Earliest evidence of mammalian social behaviour in the basal Tertiary of Bolivia
This study shows that social interactions occurred in metatherians as early as the basal Palaeocene and that solitary behaviour may not be plesiomorphic for Metatheria as a whole.
First trace and body fossil evidence of a burrowing, denning dinosaur
Burrowing habits expand the known range of nonavian dinosaur behaviours and suggest that the cursorial ancestry of dinosaurs did not fully preclude the evolution of different functional regimes, such as fossoriality.
Earliest Evolution of Multituberculate Mammals Revealed by a New Jurassic Fossil
A new basal multi is described from a nearly complete skeleton that shows that the underpinnings of these adaptations arose early in the evolution of the order, setting the stage for the major diversification and radiation of the group that came during the Cretaceous and Paleogene.
Aggregations and parental care in the Early Triassic basal cynodonts Galesaurus planiceps and Thrinaxodon liorhinus
An extensive survey of other aggregations found in these two basal cynodont taxa revealed six other unequivocal cases of aggregations in Thrinaxodon, with examples of same- age aggregations among immature or adult individuals as well as mixed-age aggregations between subadult and adult individuals.
A multivariate approach to infer locomotor modes in Mesozoic mammals
By the Late Jurassic mammals had diversified into all but the saltatorial and active flight locomotor modes, and that this diversification was greatest in the Eutriconodonta andMultituberculata, although sampling of postcranial skeletons remains uneven across taxa and through time.
Adaptive radiation of multituberculate mammals before the extinction of dinosaurs
It is shown that in arguably the most evolutionarily successful clade of Mesozoic mammals, the Multituberculata, an adaptive radiation began at least 20 million years before the extinction of non-avian dinosaurs and continued across the Cretaceous–Paleogene boundary.
Mammal disparity decreases during the Cretaceous angiosperm radiation
It is concluded that during the mid-Cretaceous, the period of rapid angiosperm radiation, mammals experienced both a decrease in morphological disparity and a functional shift in dietary morphology that were probably related to changing ecosystems.
Mandibular and dental characteristics of Late Triassic mammaliaform Haramiyavia and their ramifications for basal mammal evolution
Tests of competing phylogenetic hypotheses with new data show that Late Triassic haramiyids are a separate clade from multituberculate mammals and are excluded from the Mammalia, suggesting that dietary diversification is a major factor in the earliest mammaliaform evolution.
Functional‐adaptive analysis of the hindlimb anatomy of extant marsupials and the paleobiology of the Paleocene marsupials Mayulestes ferox and Pucadelphys andinus
  • C. Argot
  • Geography
    Journal of morphology
  • 2002
The Tiupampa fossils were therefore more agile than most living didelphids and resembled the condition observed in living dasyurids more, complementing a previous study performed on the forelimb of these fossils.