comment on this calibration
Muroidea + Ctenohystrica
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 Muroidea + Ctenohystrica 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 47.6 Ma The Kuldana Formation of Pakistan has been dated as early–middle Eocene, and ages may differ in different regions of northern India, and mammals occur in different horizons. Birbalomys is noted as occurring at 51 Ma by Marivaux et al. (2004, p. 132), thus well within the Ypresian. Hence, we assign a minimum constraint for rodents excluding the squirrel-like clade at the top of the Ypresian marine stage, hence 47.8 Ma ± 0.2 Myr = 47.6 Ma (Gradstein et al., 2012). | ||
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node maximum age 59.2 Ma The soft maximum constraint might be taken as equivalent to the age of the ischyromyids and other entirely extinct rodent groups from the late Paleocene (base of the Thanetian) of North America and Europe, 59.2 Ma ± 0.0 Myr = 59.2 Ma. | ||
| primary fossil used to date this node | ||
H-GSP 92161 | ||
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phylogenetic justification
Phylogenetic analysis by Marivaux et al. (2004) placed Eocene chapattimyids within the Ctenohystrica, close to hystricognaths and to the exclusion of diatomyids. They are therefore nested within the unnamed crown clade comprising Muroidea and Ctenohystrica. |
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phylogenetic reference(s)
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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