comment on this calibration


 node name
Charadrii     Look for this name in NCBI   Wikipedia   Animal Diversity Web
  recommended citations Smith, 2015
  node minimum age
41.3 Ma
Jiliniornis huadianensis was collected from the Middle Eocene Huadian Formation in the Jilin Province, China. Because the age of the Middle Eocene Huadian Formation is not precisely known a conservative approach was taken regarding the choice of the age prior on the node representing the split between Charadrii and the rest of the charadriiform crown clade. Although the holotype of Jiliniornis huadianensis may be older than latest Middle Eocene, an age of 41.3 Ma, corresponding to the uppermost Middle Eocene boundary (Lutetian-Bartonian boundary) is suggested as a qualitative prior on the split between Charadrii and the rest of crown Charadriiformes.
  node maximum age
0 Ma
none specified.
 primary fossil used to date this node 
IVPP V.8323
Jiliniornis huadianensis , Hou and Ericson, 2002
Location relative to the calibrated node: Stem

[show fossil details]
     Locality: Jilin Province
     Stratum: Huadian Formation
     Geological age: Lutetian, Eocene, Paleogene, Cenozoic

  phylogenetic justification
The systematic position of Jiliniornis huadianensis was evaluated by Smith (2011a) in a combined analysis of morphological and molecular sequence data (Figure 1). Not surprisingly, given that it could only be scored for 26 of 365 characters, Jiliniornis huadianensis was placed in a polytomy near the base of Charadriiformes along with Scolopaci and Charadrii species in the strict consensus cladogram resulting from the analysis of that taxon and extant charadriiform species (Smith, 2011a, figure 8.7). No alternative hypothesis has been proposed linking this specimen to any clade other than Charadrii.
  phylogenetic reference(s)
Smith, N. A. 2011a. Systematics and evolution of extinct and extant Pan-Alcidae (Aves, Charadriiformes): combined phylogenetic analyses, divergence estimation, and paleoclimatic interactions. PhD Dissertation. The University of Texas at Austin. 748pp
 tree image (click image for full size) 
tree image