Marsupial Origins

  title={Marsupial Origins},
  author={Richard. Cifelli and Brian M Davis},
  pages={1899 - 1900}


The record of extinct African metatherians (Mammalia, Theria) is scanty, restricted in time (Eocene–Miocene), and its taxonomy is still subject of debate. A review of all African metatherians, or

Taxonomy and Evolution of Sea Otters

Sea otters (Enhydra lutris) are members of the Mustelidae family, a monophyletic basal group of arctoid carnivores. They are the only member of the otter clade (subfamily Lutrinae; 13 extant species)

Ethology and Behavioral Ecology of Sea Otters and Polar Bears

  • R. DavisA. Pagano
  • Environmental Science
    Ethology and Behavioral Ecology of Marine Mammals
  • 2021
Sea otters and polar bears are marine mammals in the taxonomic order of Carnivora. Behaviorally, most carnivore species are solitary and asocial except during reproduction or while rearing offspring,

Marsupial Mammals

An emerging consensus in the evolution, phylogeny, and systematics of marsupials and their fossil relatives (Metatheria)

Marsupials and their fossil relatives, which collectively comprise Metatheria, have been of scientific interest for centuries, with many aspects of their evolution and systematics subject to intense

Network-based microsynteny analysis identifies major differences and genomic outliers in mammalian and angiosperm genomes

The rebel genes are different between the two groups: lineage-specific gene transpositions are unusual in mammals, whereas single-copy highly syntenic genes are rare for flowering plants, and microsynteny scores are proposed as an alternative and complementary metric for assessing genome assemblies.

Marsupials and Other Metatheres of South America

The carnivorous sparassodonts evolved the largest metatherian predators known, such as the 600 kg Proborhyaena, as well as the jaguar-sized saber-toothed marsupial Thylacosmilus.

Synteny-based phylogenomic networks for comparative genomics

Six chapters centering on a network approach for large-scale phylogenomic synteny analysis are presented, and it is shown that the network approach could present a much clear, strong, and systematic graph, with integrated synteny information from 101 broadly distributed species.

Comparative Phylogenomic Synteny Network Analysis of Mammalian and Angiosperm Genomes

The results illustrate and quantify overall synteny conservation and diversification properties of all annotated genes for mammals and angiosperms and show that plant genomes are in general more dynamic.



A molecular timescale for vertebrate evolution

The clock-like accumulation of sequence differences in some genes provides an alternative method by which the mean divergence time can be estimated, and the molecular times agree with most early and late fossil-based times, but indicate major gaps in the Mesozoic fossil record.

Fossil evidence for the origin of the marsupial pattern of tooth replacement

An ultra-high-resolution X-ray computed tomography study of the tiny fossil Alphadon is presented, which represents the first evidence of dental development and replacement in a Mesozoic marsupial.

The origin of eutherian mammals

Eutherian-style trophoblast probably originated in the Mesozoic, and boosts in diversity were probably secondary and dependent upon prior innovation of trophoblastic/uterine wall immunological protection of foetal tissues during prolonged intra-uterine development.

Dual origin of tribosphenic mammals

Phylogenetic and morphometric analyses including these newly discovered taxa suggest a different interpretation: that mammals with tribosphenic molars are not monophyletic.

The earliest known eutherian mammal

The skeleton of a eutherian (placental) mammal found in northeastern China has limb and foot features that are known only from scansorial and arboreal extant mammals, in contrast to the terrestrial or cursorial features of other Cretaceous eutherians.

Evolution of the Monotremes: Phylogenetic Relationship to Marsupials and Eutherians, and Estimation of Divergence Dates Based on α-Lactalbumin Amino Acid Sequences

The distance data support the view that the echidna and platypus lineages diverged from their last common ancestor at least 50 to 57 Ma (million years ago) and that monotremes diverging from marsupials and eutherian mammals about 163 to 186 Ma.

An Early Cretaceous Tribosphenic Mammal and Metatherian Evolution

New data from this fossil support the view that Asia was likely the center for the diversification of the earliest metatherians and eutherians during the Early Cretaceous.