Relaxed phylogenetics and dating with confidence plos biology double your dating cocky
The degree to which a model fits the data at hand (accuracy) is always improved by adding more parameters (complexity), but since the amount of data remains constant the statistical uncertainty about each parameter increases.
In addition, the biological meaning of each parameter becomes harder to decipher so the explanatory power of the model decreases ( ).
Molecular Ecology 17, 4398–4417.| Gómez-Acevedo S, Rico-Arce L, Delgado-Salinas A, Magallon S, Eguiarte LE (2010) Neotropical mutualism between Acacia and Pseudomyrmex: phylogeny and divergence times. (Royal Botanic Gardens: Kew) Macphail MK, Hill RS (2001) Palaeobotany of Acacia and related Mimosaceae. Quaternary Science Reviews 28, 3197–3210.| Sauquet H, Ho SYW, Gandolfo MA, Jordan GJ, Wilf P, Cantrill DJ, Bayly MJ, Bromham L, Brown GK, Carpenter RJ, Lee DM, Murphy DJ, Sniderman JMK, Udovicic F (2012) Testing the impact of calibration on molecular divergence times using a fossil-rich group: the case of Nothofagus (Fagales).
Molecular Phylogenetics and Evolution 56, 393–408.| Lanfear R, Calcott B, Ho SYW, Guindon S (2012) Partition Finder: combined selection of partitioning schemes and substitution models for phylogenetic analyses. Systematic Biology 61, 289–313.| Simon MF, Grether R, de Queiroz LP, Skema C, Pennington RT, Hughes CE (2009) Recent assembly of the Cerrado, a neotropical plant diversity hotspot, by in situ evolution of adaptations to fire.
However, the broader subfamily Mimosoideae offers several reliably age-constrained fossils that can be used as calibrations in divergence-dating analyses of DNA sequence data.