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Rapid evolution to terrestrial life in Jamaican crabs
Molecular evidence is presented that Jamaican land crabs represent a single adaptive radiation from a marine ancestor that invaded terrestrial habitats only 4 million years ago and probably reflects the Mid-Tertiary inundation of that island.
New World direct-developing frogs (Anura: Terrarana): Molecular phylogeny, classification, biogeography, and conservation
New World frogs recently placed in a single, enormous family (Brachycephalidae) have direct development and reproduce on land, often far away from water and most of the 100 informal groups (species series, species groups, and species subgroups) are new or newly defined.
A genomic timescale of prokaryote evolution: insights into the origin of methanogenesis, phototrophy, and the colonization of land
Early time estimates for methanogenesis support the consideration of methane, in addition to carbon dioxide, as a greenhouse gas responsible for the early warming of the Earths' surface and support most of the currently recognized higher-level groupings of prokaryotes.
A molecular timescale of eukaryote evolution and the rise of complex multicellular life
The results suggest that oxygen levels in the environment, and the ability of eukaryotes to extract energy from oxygen, as well as produce oxygen, were key factors in the rise of complex multicellular life.
The origin and evolution of model organisms
- S. Hedges
- BiologyNature Reviews Genetics
- 1 November 2002
The phylogeny and timescale of life are becoming better understood as the analysis of genomic data from model organisms continues to grow and the emphasis on historical patterns is helping to bridge barriers among organism-based research communities.
The phylogeny of squamate reptiles (lizards, snakes, and amphisbaenians) inferred from nine nuclear protein-coding genes.
Molecular evidence for multiple origins of Insectivora and for a new order of endemic African insectivore mammals.
- M. Stanhope, V. Waddell, M. Springer
- BiologyProceedings of the National Academy of Sciences…
- 18 August 1998
The traditional views regarding the mammalian order Insectivora are that the group descended from a single common ancestor and that it is comprised of the following families: Soricidae (shrews),…
Divergence time estimates for the early history of animal phyla and the origin of plants, animals and fungi
- Daniel Y.-C. Wang, Sudhir Kumar, S. Hedges
- BiologyProceedings of the Royal Society of London…
- 22 January 1999
By inference, the basal animal phyla (Porifera, Cnidaria, Ctenophora) diverged between about 1200 – 1500 Ma, which suggests that at least sixAnimal phyla originated deep in the Precambrian, more than 400 million years earlier than their first appearance in the fossil record.
Major Caribbean and Central American frog faunas originated by ancient oceanic dispersal
- M. Heinicke, W. Duellman, S. Hedges
- Biology, Environmental ScienceProceedings of the National Academy of Sciences
- 12 June 2007
Molecular clock analyses reject the prevailing hypothesis that these frogs arose from land connections with North and South America and their subsequent fragmentation in the Late Cretaceous, and suggest Origin by dispersal, probably over water from South America in the early Cenozoic is more likely.
Early evolution of the venom system in lizards and snakes
Demonstration that the snakes, iguanians and anguimorphs form a single clade provides overwhelming support for a single, early origin of the venom system in lizards and snakes.