comment on this calibration


 node name
Macromiidae     Look for this name in NCBI   Wikipedia   Animal Diversity Web
  recommended citations Kohli et al., 2016
  node minimum age
15.5 Ma
Age estimates for the Latah Formation span the Burdigalian-Langhian-Serravallian (Miocene). Based on an electron microprobe analysis of Fe and Ca content in ash samples, Nash and Perkins (2012) correlated the previously undated Latah Formation to the well-dated lower Bully Creek Formation (also dated by electron microprobe analysis), and thus establish an absolute age of 15.8-15.5 Ma (Langhian).
  node maximum age
None specified
 primary fossil used to date this node 
UCMP 28198
Epophthalmia biordinata , Lewis, 1969
Location relative to the calibrated node: Crown

[show fossil details]
     Locality: Marshall Creek, Spokane, Washington
     Stratum: Latah Formation
     Geological age: Miocene, Neogene, Cenozoic

More information in Fossilworks   PaleoBioDB

  phylogenetic justification
This is a fossil that is assigned to the genus Epophthalmia, which has been recovered by Ware and Ballare (unpublished data) within the family Macromiidae. Synapomorphies supporting this assigning of the fossil wing include the presence of more antenodal crossveins than Macromia, or Didymops, which are all sister taxa to Epophthalmia. Additionally, the anal loop in this fossil more closely resembles to Epophthalmia than any of the other members of Macromiidae (Lewis, 1969). Nel and Paicheler (1994) considered the attribution to the recent genus Epophthalmia as probable.
  phylogenetic reference(s)
Lewis, S.E. 1969. Fossil insects of the Latah Formation (Miocene) of eastern Washington and northern Idaho. Northwest Science, 43:99-115.
 tree image (click image for full size) 
tree image
Figure 3 from Kohli et al. (2016).