Lineage (NCBI): root » Eukaryota » Opisthokonta » Metazoa » Coelomata » Craniata <chordata> » Euteleostomi » Sauropsida » Coelurosauria » Aves » Charadriiformes » Cepphus » Cepphus carbo
Charinidae Look for this name in NCBI Wikipedia Animal Diversity Web
http://palaeo-electronica.org/content/fc-6 Head, 2015
node minimum age |
Minimum age is based on faunal correlation of Medicine Pole Hills fossil localities (Bowman County, North Dakota) with Flagstaff Rim localities (Natrona County, Wyoming), which are overlain by an ash layer (Ash B) that is 40Ar/39Ar dated at 35.41 ± 0.14 Ma (Obradovich et al., 1995). Smith (2011) recalculated the minimum estimate for the Medicine Pole Hills local fauna at 35.2 Ma.
node maximum age |
|primary fossil used to date this node|
This fossil preserves apomorphies including caudal vertebrae lacking paired haemapophyses, with haemal keels present. This morphology is only present in Ungaliophis and Exiliboa among extant taxa (Smith, 2013).
Smith, K.T. 2013. New constraints on the evolution of the snake clades Ungaliophiinae, Loxocemidae and Colubridae (Serpentes), with comments on the fossil history of Erycine boids in North America. Zoologischer Anzeiger, 252:157-182.
|tree image (click image for full size)|