comment on this calibration

Strepsirhini

Lineage (NCBI): root » Eukaryota » Embryophyta » magnoliids » Annonaceae
 node name
Strepsirhini     Look for this name in NCBI   Wikipedia   Animal Diversity Web
 
  recommended citations
http://palaeo-electronica.org/content/fc-1 Benton et al. 2015
 
  node minimum age
33.9 Ma
Following Seiffert (2006), the Birket Quarun Formation of the Fayûm corresponds to the Priabonian with an upper bound of 33.9 Ma.
 
  node maximum age
56 Ma
Fossil primates are relatively common mammalian fossils at many localities in North America and Eurasia throughout the Eocene; yet crown strepsirhines remain conspicuously absent prior to the late Eocene. Hence, we suggest the first appearance of euprimates, represented by Altiatlasius from the late Paleocene of Morocco (Sigé et al., 1990) as the soft maximum for Strepsirhini, namely 56 Ma ± 0.0 Myr = 56 Ma.
 
 primary fossil used to date this node 
 
CGM 40265
Karanisia clarki , Seffert et al., 2003
Location relative to the calibrated node: Crown

[show fossil details]
     Locality: Fayûm
     Stratum: Birket Quarun Formation
     Geological age: Eocene, Paleogene, Cenozoic


More information in Fossilworks   PaleoBioDB
 
 

 
  phylogenetic justification
Phylogenetic analysis (Seffert et al., 2003) shows Karanisia is a member of crown Stresirrhini. It is loris-like, and has a dentition similar to the extant lorisid Arctocebus. Subsequent cladistic study (Seiffert, 2007) still could not place Karanisia unequivocally, and it was identified as either a stem lorisiform or a crown strepsirrhine of uncertain affinities; in either case it is nested within crown Strepsirrhini.
 
  phylogenetic reference(s)
Seiffert, E.R., Simons, E.L., and Attia, Y. 2003. Fossil evidence for an ancient divergence of lorises and galagos. Nature, 422:421-424.
 
 tree image (click image for full size) 
tree image
Figure 11 of Benton et al. (2014)
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