comment on this calibration


 node name
Calidridinae     Look for this name in NCBI   Wikipedia   Animal Diversity Web
  recommended citations Smith, 2015
  node minimum age
11.62 Ma
The Nördlinger Ries basin is an impact crater, and an absolute minimum age for the impact event was established at 14.8 ± 0.7 Ma based on radiometric methods (Ballmann, 2004). Fossils from the Nördlinger Ries basin have been dated to the Middle Miocene (Astaracian; MN 6; 16.0-11.6 Ma; i.e., Langhian-Serravallian) on the basis of faunal correlation (Ballmann, 2004). The exact age of the fossils has not been determined so a conservative strategy of using the age of the Serravallian-Tortonian boundary is recommended until more precise age estimates become available.
  node maximum age
0 Ma
none specified.
 primary fossil used to date this node 
Steinber 1970 XVIII
Mirolia brevirostrata, Ballmann, 2004
Location relative to the calibrated node: Stem

[show fossil details]
     Locality: Nördlinger Ries basin
     Stratum: Nördlinger Ries
     Geological age: Serravallian, Miocene, Neogene, Cenozoic

  phylogenetic justification
The holotype and referred specimens of Mirolia brevirostrata were referred to Calidridinae arctic sandpipers on the basis of apomorphic characters of the cranium and postcranium (Ballmann, 2004). The following apomorphies that support referral of Mirolia brevirostrata to Calidridinae were cited by Ballmann (2004:111): “the shallow and narrow origin of m. depressor mandibulae on the cranium and the corresponding short processus retroarticularis; the relatively short bill, with a moderately reinforced dorsal bar; the shape of the processus supracondylaris dorsalis on the humerus; humerus about the same length as the tarsometatarsus.” Although material referred to Mirolia brevirostrata has not been included in a phylogenetic analysis, the referral of material to this clade has not been questioned (De Pietri and Mayr, 2012).
  phylogenetic reference(s)
Ballmann, P. 2004. Fossil Calidridinae (Aves: Charadriiformes) from the Middle Miocene of the Nördlinger Ries. Bonner Zoologische Beiträge, 52:101-114.
 tree image (click image for full size) 
tree image
Figure 1 from Smith (2015).