comment on this calibration

Colubridae+Elapoidea

Lineage (NCBI): This node has no ancestors.
 node name
Colubridae+Elapoidea     Look for this name in NCBI   Wikipedia   Animal Diversity Web
 
  recommended citations
http://palaeo-electronica.org/content/fc-9 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).
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