comment on this calibration
Anura
Lineage (NCBI):
root
» Eukaryota
» Opisthokonta
» Metazoa
» Eumetazoa
» Bilateria
» Coelomata
» Deuterostomia
» Chordata
» Craniata <chordata>
» Vertebrata <Metazoa>
» Gnathostomata <vertebrate>
» Euteleostomi
» Sarcopterygii
» Tetrapoda
» Amphibia
» Batrachia
» Anura
| node name Anura 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 165.3 Ma The Forest Marble Formation has long been assigned to the Late Bathonian, dated as 166.5-166.1 Ma ± 1.2 Ma (Gradstein et al., 2012, pp. 765, 777), so giving an age of 165.3 Ma as the minimum constraint. | ||
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node maximum age 201.5 Ma The soft maximum constraint can be set as equivalent to the base of the Jurassic, allowing for finds of various stem anurans and other small tetrapods from several continents, but as yet no crown taxa, and so 201.3 Ma ± 0.2 Ma, so 201.5 Ma. | ||
| primary fossil used to date this node | ||
NHMUK R11700 | ||
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phylogenetic justification
Eodiscoglossus is identified as a member of crown Discoglossidae on the basis of two apomorphies in combination, the possession of opisthocoelous vertebrae together with an ilium bearing a dorsal crest (Evans et al., 1990; Ruta and Coates, 2007). |
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phylogenetic reference(s)
Ruta M., and Coates M.I. 2007. Dates, nodes and character conflict: addressing the lissamphibian origin problem. Journal of Systematic Palaeontology, 5:69–122.
Evans, S.E., Milner, A.R., and Mussett, F. 1990. A discoglossid frog (Amphibia: Anura) from the Middle Jurassic of England. Palaeontology, 33:299-311.
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| tree image (click image for full size) | ||
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Figure 7 from Benton et al. (2015).
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