comment on this calibration
Charininae
Lineage (NCBI):
root
» Eukaryota
» Opisthokonta
» Metazoa
» Eumetazoa
» Bilateria
» Coelomata
» Deuterostomia
» Chordata
» Craniata <chordata>
» Vertebrata <Metazoa>
» Gnathostomata <vertebrate>
» Euteleostomi
» Sarcopterygii
» Tetrapoda
» Amniota
» Sauropsida
» Sauria
» Lepidosauria
» Scleroglossa
» Serpentes
» Henophidia
» Boidae
» Erycinae
» Charina
| node name Charininae Look for this name in NCBI Wikipedia Animal Diversity Web | ||
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recommended citations http://palaeo-electronica.org/content/fc-6 Head, 2015 |
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node minimum age 18.7 Ma The minimum age is derived from radiometric dating of the Eagle Crag Ash, which overlies the top of the Harrison Formation, to 19.2 ± 0.5 Ma (MacFadden and Hunt, 1998; Tedford et al., 2004). Tedford et al. (2004, figure 6.2) indicate the top of the Harrison Formation may be as old as 20 Ma. | ||
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node maximum age 0 Ma None specified. | ||
| primary fossil used to date this node | ||
USNM 125562 | ||
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phylogenetic justification
UNSM 125562 is referred to the total clade of Charina (all fossil taxa more closely related to extant Charina than extant Lichanura) on the basis of the following caudal vertebral characters: 1) caudal tailclub composed of more than six vertebrae; 2) laterally expanded, lobate distal neural spine; 3) Anteriorly directed pterapophyses (=“postzygapophyseal wing” of Szyndlar, 1994) present (Kluge, 1993; Szyndlar, 1994; Parham et al., 2012). |
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phylogenetic reference(s)
Kluge, A.G. 1993. Aspidites and the phylogeny of pythonine snakes. Records of the Australian Museum Supplement , 19:1-77.
Szyndlar, Z. 1994. Oligocene snakes of southern Germany. Journal of Vertebrate Paleontology, 14:24-37.
Parham, J.F., Donoghue, P.C.J., Bell, C.J., Calway, T.D., Head, J.J., Holroyd, P.A., Inoue, J.G., Irmis, R.B., Joyce, W.G., Ksepka, D.T., Patańe, J.S.L.N., Smith, D., Tarver, J.E., van Tuinen, M., Yang, Z., Angielczyk, K.D., Greenwood, J., Hipsley, C.A., Jacobs, L.L., Makovicky, P.J., Müller, J., Smith, K.T., Theodor, J.M., Warnock, R.C.M., and Benton, M.J. 2012. Best practices for applying paleontological data to molecular divergence dating analyses. Systematic Biology, 61:346-359.
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| tree image (click image for full size) | ||
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Figure 1 from Head (2015).
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