Mammalian evolution: Relationships to chew over

  title={Mammalian evolution: Relationships to chew over},
  author={Anne Weil},
  • A. Weil
  • Published 4 January 2001
  • Biology
  • Nature
Did advanced mammals evolve on the southern continents and then move north? Not according to a new study, which concludes that such mammals evolved in both the south and the north. 

Spiny Norman in the Garden of Eden? Dispersal and early biogeography of Placentalia

The persistent finding of clades endemic to the southern continents (Afrotheria and Xenarthra) near the base of the placental mammal tree has led molecular phylogeneticists to suggest an origin of Placentalia, the crown group of Eutheria, somewhere in the southern continent with few supraordinal splits occurring before the last 5–10 million years of the Cretaceous.

Third meeting of the International Society for Phylogenetic Nomenclature: a report

Topics discussed at the ISPN meeting include problems created by rank-based nomenclature in various eukaryotic taxa, dealing with hybrids in rank‐based and phylogenetic nomenClature, phyloinformatics, the choice of names to use when the taxonomic content associated with available names varies, teaching phylogeneticnomenclumber, and the application of phylogeneticNomenclatures to specific taxa.

Programmed Frameshifting in Budding Yeast

The budding yeast, Saccharomyces cerevisiae, and the endogenous L-A virus provided two of the earliest analyzed examples of programmed translational frameshifted events, andBioinformatic analysis suggests that many genes may employ −1 frameshifting although the function of the frameshift in those genes remains controversial.



Molecular systematics: The platypus put in its place

The duck-billed platypus is a monotreme - a mammal that lays eggs that has been seen as more primitive than both marsupial and placental mammals, and placed on an evolutionary lineage which pre-dates the divergence of marsupials and placentals.

First Mesozoic mammal from Australia—an early Cretaceous monotreme

Here we describe Australia's first known Mesozoic mammal and the first known early Cretaceous mammal from Gondwanaland. Steropodon galmani n. gen. and sp., discovered in early Cretaceous sediments at

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.

A tribosphenic mammal from the Mesozoic of Australia.

A small, well-preserved dentary of a tribosphenic mammal with the most posterior premolar and all three molars in place has been found in Aptian (Early Cretaceous) rocks of southeastern Australia. In

A Middle Jurassic mammal from Madagascar

The lower molars of tribosphenic mammals (marsupials, placentals and their extinct allies) are marked, primitively, by a basined heel (talonid) acting as the mortar to the pestle of a large inner