comment on this calibration


Lineage (NCBI): root » Eukaryota » Opisthokonta » Metazoa » Coelomata » Mollusca
 node name
Lagomorpha     Look for this name in NCBI   Wikipedia   Animal Diversity Web
  recommended citations Benton et al. 2015
  node minimum age
47.6 Ma
The Cambay Shale of West-Central India is dated as middle Ypresian based on the occurrence of foraminifera diagnostic of the Shallow Benthic Zone 10 and planktonic zone 6b (Rose et al., 2008). The top of the Ypresian is dated at 47.8 Ma ± 0.2 Myr = 47.6 Ma (Gradstein et al., 2012).
  node maximum age
66 Ma
For the soft maximum divergence of crown lagomorphs we choose the K-Pg boundary at 66.04 Ma ± 0.4 Myr = 66 Ma, based on the occurrence of basal Glires such as Mimotona and Heomys (Dashzeveg and Russell, 1988; Li and Ting, 1993).
 primary fossil used to date this node 
GU/RSR/V 711
Leporidae sp. , NO REFERENCE
Location relative to the calibrated node: Crown

[show fossil details]
     Locality: Vastan mine
     Stratum: Cambay Shale
     Geological age: Eocene, Paleogene, Cenozoic

  phylogenetic justification
Rose et al. (2008) identified these fossils as lagomorph on the basis of the occurrence of a calcaneal canal that passes diagonally through the bone, entering on the lateral side just inferior or proximal to the fibular facet and emerging just distal to the sustentacular facet and proximal to the cuboid facet. Further, in their cladistic analysis, Rose et al. (2008) assigned the Vastan ankle bones unequivocally to Leporidae, the hares, nested well within crown Lagomorpha.
  phylogenetic reference(s)
Rose, K.D., DeLeon, V.B., Missiaen, P., Rana, R.S., Sahni, A., Singh, L., and Smith, T. 2008. Early Eocene lagomorph (Mammalia) from Western India and the early diversification of Lagomorpha. Proceedings of the Royal Society, Series B, 275:1203-1208.
 tree image (click image for full size) 
tree image
Figure 11 of Benton et al. (2014)