comment on this calibration


 node name
Colubridae+Elapoidea     Look for this name in NCBI   Wikipedia   Animal Diversity Web
  recommended citations Head et al. 2016
  node minimum age
30.8 Ma
The minimum age is based on the age of the type locality at Mas de Got A, which is correlated to Paleogene Mammal (MP) biochron 22. MP 22 ranges from 32.6 ± .1 Ma to 30.9 ± .1 Ma (Schmidt-Kittler, 1987; İslamoğlu et al., 2006; Szyndlar, 2012; Rage, 2006; Augé and Rage, 2014
  node maximum age
None specified
 primary fossil used to date this node 
MGT 3505
Coluber cadurci, Rage, 1974
Location relative to the calibrated node: Stem

[show fossil details]
     Locality: Mas de Got A
     Geological age: Oligoene, Paleogene, Cenozoic

  phylogenetic justification
Assignment to (Colubridae+Elapoidea) is based on the presence of: a well-developed, narrow haemel keel that is uniform in transverse width and extends from an expanded cotylar ventral lip anteriorly to terminate posteriorly just anterior to the condyle; epizygapophyseal spines, and; elongate prezygapophyseal accessory processes (Rage, 1974).
  phylogenetic reference(s)
Rage, J.-C. 1974. Les serpents des phosphorites du Quercy. Palaeovertebrata, 6:247-303.
 tree image (click image for full size) 
tree image
Figure 1 from Head et al. (2016).