When less means more: evolutionary and developmental hypotheses in rodent molars.


Tooth number in rodents is an example of reduction in evolution. All rodents have a toothless diastema lacking canine and most premolars present in most other mammals. Whereas some rodent lineages retained one premolar (p4), many others lost it during evolution. Recently, an 'inhibitory cascade' developmental model (IC) has been used to predict how the… (More)
DOI: 10.1111/j.1420-9101.2012.02587.x