title: Diversification rates and phenotypic evolution in venomous snakes (Elapidae).
abstract: The relationship between rates of diversification and of body size change (a common proxy for phenotypic evolution) was investigated across Elapidae, the largest radiation of highly venomous snakes. Time-calibrated phylogenetic trees for 175 species of elapids (more than 50% of known taxa) were constructed using seven mitochondrial and nuclear genes. Analyses using these trees revealed no evidence for a link between speciation rates and changes in body size. Two clades (Hydrophis, Micrurus) show anomalously high rates of diversification within Elapidae, yet exhibit rates of body size evolution almost identical to the general elapid 'background' rate. Although correlations between speciation rates and rates of body size change exist in certain groups (e.g. ray-finned fishes, passerine birds), the two processes appear to be uncoupled in elapid snakes. There is also no detectable shift in diversification dynamics associated with the colonization of Australasia, which is surprising given that elapids appear to be the first clade of venomous snakes to reach the continent.
authors.affiliation: Earth Sciences Section, South Australian Museum, North Terrace, Adelaide, SA 5000, Australia; School of Biological Sciences, University of Adelaide, Adelaide, SA 5005, Australia; School of Biological Sciences, Flinders University, PO Box 2100, Adelaide, SA 5001, Australia.
authors.forename: Michael S Y
authors.initials: MS
authors.lastname: Lee
authors.affiliation: School of Biological Sciences , University of Adelaide , Adelaide, SA 5005, Australia.
authors.forename: Kate L
authors.initials: KL
authors.lastname: Sanders
authors.affiliation: School of Biological Sciences , Flinders University , PO Box 2100, Adelaide, SA 5001, Australia.
authors.forename: Benedict
authors.initials: B
authors.lastname: King
authors.affiliation: Earth Sciences Section, South Australian Museum, North Terrace, Adelaide, SA 5000, Australia; School of Biological Sciences, University of Adelaide, Adelaide, SA 5005, Australia.
authors.forename: Alessandro
authors.initials: A
authors.lastname: Palci
keywords: body size; macroevolution; phylogenetics; reptiles; speciation rates