comment on this calibration
Rodentia
Lineage (NCBI):
root
» Eukaryota
» Opisthokonta
» Metazoa
» Eumetazoa
» Bilateria
» Coelomata
» Deuterostomia
» Chordata
» Craniata <chordata>
» Vertebrata <Metazoa>
» Gnathostomata <vertebrate>
» Euteleostomi
» Sarcopterygii
» Tetrapoda
» Amniota
» Mammalia
» Theria <Mammalia>
» Eutheria
» Euarchontoglires
» Glires
» Rodentia
| node name Rodentia Look for this name in NCBI Wikipedia Animal Diversity Web | ||
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recommended citations http://palaeo-electronica.org/content/fc-1 Benton et al. 2015 |
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node minimum age 56 Ma An index taxon for the Clarkforkian (Rose, 1981; Anemone and Dirks, 2009), Paramys is known from late Paleocene localities in North America and as such correlates with the Thanetian stage, the minimum bound of which is 56 Ma ± 0.0 Myr = 56 Ma (Gradstein et al., 2012). | ||
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node maximum age 66 Ma Taxa such as Heomys and Mimotona are Glires, but do not belong within crown Rodentia or Lagomorpha (Meng et al., 2003; Asher et al., 2005). Therefore, a reasonable soft maximum constraint on the base of crown Rodentia could be set by these stem rodents at the base of the Paleocene, at 66.04 Ma ± 0.4 Myr = 66 Ma. | ||
| primary fossil used to date this node | ||
YPM PU 14200 | ||
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phylogenetic justification
Phylogenetic analyses place Paramys in Sciuromorpha, the squirrel-related clade, based on characters of the ear region (Korth, 1984; McKenna and Bell, 1997; Marivaux et al., 2004). Paramys is then nested well within crown Rodentia. |
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phylogenetic reference(s)
Korth, W.W. 1984. Earliest Tertiary evolution and radiation of rodents in North America. Bulletin of Carnegie Museum of Natural History, 24:1-71.
Marivaux, L., Vianey-Liaud, M., and Jaeger, J.J. 2004. High-level phylogeny of early Tertiary rodents: dental evidence. Zoological Journal of the Linnean Society, 142:105-134.
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| tree image (click image for full size) | ||
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Figure 11 of Benton et al. (2014)
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