Relaxed phylogenies and dating with confidence
In ‘The Biology of Australian Possums and Gliders’.
CO;2&atitle=Periotic morphology in the trichosurin possums Strigocuscus celebensis and Wyulda squamicaudata (Diprotodontia, Phalangeridae) and a revised diagnosis of the tribe Trichosurini.&title=American Museum Novitates&date=2003&volume=3414&spage=1&epage=cf Article2ecfc1997462761$func [email protected]&aulast=Crosby&aufirst=K." target="_blank" (1987).
In response to the documentation of widespread departures from clocklike behavior, a variety of local- and relaxed-clock methods have been proposed and implemented.
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).
Morphological studies have suggested that Ailurops ursinus is the sister taxon to all other phalangerids.
Another species of interest is Strigocuscus celebensis, whose morphologically based taxonomic affinity has habitually been with trichosurins. This study uses nuclear sequence data from the breast cancer and ovarian cancer susceptibility gene 1 (BRCA1) to test previous mitochondrial DNA results and uses relaxed molecular clock methods to estimate divergence dates. celebensis and this clade as sister to Phalangerini.
BEAST is a cross-platform program for Bayesian analysis of molecular sequences using MCMC.
• : With the exception of the age of the angiosperms themselves, these age estimates are generally younger than other recent molecular estimates and very close to dates inferred from the fossil record.
Characterization of the living species of cuscus (Marsupialia: Phalangeridae).