Mammalian evolution: Upwards and onwards

  title={Mammalian evolution: Upwards and onwards},
  author={Anne Weil},
  • A. Weil
  • Published 25 April 2002
  • Biology
  • Nature
A newly described fossil sits on one of the lowest branches of the placental-mammal family tree. But its paws and claws suggest that, where actual vegetation was concerned, it could climb further than its contemporaries. 

A Late Jurassic Digging Mammal and Early Mammalian Diversification

Parsimony analysis suggests that this fossil represents a separate basal mammalian lineage with some dental and vertebral convergences to those of modern xenarthran placentals, and reveals a previously unknown ecomorph of early mammals.

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.

An evolutionary model for identifying genetic adaptation to high altitude.

Serial studies during pregnancy as well as postpartum in Andean and European residents of high (3600 m) and low (300 m) altitude will permit evaluation of whether uteroplacental O2 delivery is lower in the European than Andean women and, if so, the physiological factors responsible.

NK Cells and Trophoblasts

  • P. Parham
  • Biology
    The Journal of experimental medicine
  • 2004
In placental mammals, viviparity—the production of living young within the mother's body—evolved under the auspices of the immune system. Elements of immunity were incorporated, giving pregnancy a

Detection and significance of main anchoring villus in early pregnancy

To find and explore the relationship among the length of the embryo's main anchoring villus and the week of gestation, embryonic crown‐rump length (CRL), and maternal blood human chorionic

Somatic Genomic Variations in Extra-Embryonic Tissues

It is concluded that aneuploidy is a part of the normal process of placentation potentially limiting the proliferative capabilities of invasive cytotrophoblasts and somatic genomic variations may exert a beneficial, anti-neoplastic effect on the organism.

The Natures of War

“Nature” is more than a resource bank whose riches can trigger armed conflict and finance its depredations; it is also a medium through which military and paramilitary violence is conducted. The

The quest for riches, or how mining silver in Bolivia has enriched our knowledge of the mechanisms underlying reproductive success.

  • L. Moore
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    High altitude medicine & biology
  • 2003
By the mid 1600s, Potosi had attained a population of 200,000, making it one of the largest and certainly the wealthiest city in South America, leaving an historic and architectural legacy that prompted UNESCO to declare it a World Heritage Site in 1987.

Right ventricular phenotype, function, and failure: a journey from evolution to clinics

A complete picture from evolution, formation, and clinical presentation of right ventricular (mal)adaptation and failure on a molecular, cellular, biomechanical, and (patho)anatomical basis is presented.



A Chinese triconodont mammal and mosaic evolution of the mammalian skeleton

The derived pectoral girdle of this new triconodont indicates that homoplasies are as common in the postcranial skeleton as they are in the skull and dentition in the evolution of Mesozoic mammals.

Biostratigraphy of new pterosaurs from China

Pterosaurs are represented in China by five genera and some isolated bones ranging in age from the Middle Jurassic to the Late Cretaceous period. Four of these genera belong to the derived

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.

The postcranial skeletons of the Triassic mammals Eozostrodon, Megazostrodon and Erythrotherium.

The purposes of this monograph are to describe the postcranial skeletons of the earliest known mammals, and to probe, in so far as possible by osteological study, biological questions concerning the

Morphological correlates of substrate use in didelphid marsupials: implications for primate origins

Comparisons of hand and foot proportions demonstrate that Marmosa and Caluromys, didelphids that rely on vines or terminal branches, possess more prehensile extremities than Monodelphis, Didelphis, and Philander, which travel and feed mainly on the ground.

Epipubic bones in eutherian mammals from the Late Cretaceous of Mongolia

The occurrence of epipubic bones in two Cretaceous eutherians suggests that the dramatic modifications connected with typical placental reproduction, may have been later events in the evolution of the Eutheria.

An Ossified Meckel's Cartilage in Two Cretaceous Mammals and Origin of the Mammalian Middle Ear

The evidence shows that brain expansion may not be the initial factor that caused the separation of postdentary bones from the dentary as middle ear ossicles during mammalian evolution.

A new symmetrodont mammal from China and its implications for mammalian evolution

This analysis suggests that this new taxon represents a part of the early therian radiation before the divergence of living marsupials and placentals; that therians and multituberculates are more closely related to each other than either group is to other mammalian lineages.