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, orExpand
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 intenseExpand
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. Expand
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. Expand
Deep time diversity of metatherian mammals: implications for evolutionary history and fossil-record quality
Comparison of the raw and sampling-corrected diversity estimates, coupled with evaluation of “coverage” and number of prolific sites, demonstrates that the metatherian fossil record is spatially and temporally extremely patchy, and assessments of macroevolutionary patterns based on the raw fossil record are inadvisable. Expand
Evolutionary Associations of Endosymbiotic Ciliates Shed Light on the Timing of the Marsupial–Placental Split
  • P. Vďačný
  • Biology, Medicine
  • Molecular biology and evolution
  • 2018
Time-calibrated phylogeny of main trichostome lineages might help to elucidate controversies in the geological and molecular timing of the split between marsupials and placental mammals. Expand
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. Expand
Do Developmental Constraints and High Integration Limit the Evolution of the Marsupial Oral Apparatus?
A case study of the ontogeny of the mammalian cranium is focused on a comparison between marsupials and placentals, suggesting that high integration may compound the effects of the functional constraints for continuous suckling to ultimately limit the ontogenic and adult disparity of the marsupial oral apparatus throughout their evolutionary history. Expand
The Placentation of Eulipotyphla—Reconstructing a Morphotype of the Mammalian Placenta
A histological and ultrastructural investigation of the placenta in three representatives of Eulipotyphla, that is, core insectivores, supports the widely accepted hypothesis that the stem lineage of Placentalia is characterized by an invasive, either endothelio‐ or hemochorial placentA. Expand


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. Expand
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. Expand
The evolution of tribospheny and the antiquity of mammalian clades.
Cl cladistic evidence is presented for a single origin of tribosphenic molars and Ambondro may be a stem eutherian, making the split between marsupials and placentals at least 167 m.y. old. Expand
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. Expand
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. Expand
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. Expand
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. Expand
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. Expand