Relaxed phylogenies and dating with confidence
BEAST is a cross-platform program for Bayesian analysis of molecular sequences using MCMC.It is entirely orientated towards rooted, time-measured phylogenies inferred using strict or relaxed molecular clock models.Mitochondrial 12S r RNA results, however, found moderate support for an Ailurops and Strigocuscus celebensis clade and placed A. Relaxed molecular-dating methods suggest a date of 23–29 million years for the split between Trichosurini and the remaining phalangerids and 19–24 million years for the split between Ailurops Strigocuscus celebensis and Phalangerini.
Local-clock methods permit different molecular clocks in different parts of the phylogenetic tree, thereby retaining the advantages of the classical molecular clock while casting off the restrictive assumption of a single, global rate of substitution (Rambaut and Bromham 1998; Yoder and Yang 2000).We also provide dates for all major angiosperm clades (including 45 orders and 335 families [208 stem group age only, 127 both stem and crown group ages], sensu APG III).Our analyses provide a new comprehensive source of reference dates for major angiosperm clades that we hope will be of broad utility.Angiosperms are a diverse and species-rich clade of green plants, with the number of described species ranging from 250000 (Wilson, 1992) or 260000 (Takhtajan, 1997; see also Thorne, 2002; Scotland and Wortley, 2003) to perhaps 400000 (Raven in Jarvis, 2007).
Flowering plants are also ecologically diverse and are found in every terrestrial habitat, as well as both fresh and saltwater habitats.
In ‘The Biology of Australian Possums and Gliders’.