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Nanocuris improvida
Taxonomy
Nanocuris improvida was named by Fox et al. (2007). Its type specimen is RSM P2523.260, a mandible (incomplete right dentary containing the canine, p1, m3, and the broken roots of other teeth), and it is not a trace fossil. Its type locality is Eastend "Scotty" site, RSM loc. 72F07-0022, which is in a Maastrichtian channel sandstone/siltstone in the Frenchman Formation of Canada.
Synonymy list
| Year | Name and author |
|---|---|
| 2007 | Nanocuris improvida Fox et al. p. 822 |
| 2010 | Nanocuris improvida Wilson and Riedel p. 873 figs. 2-4 |
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If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.
†Nanocuris improvida Fox et al. 2007
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| G. P. Wilson and J. A. Riedel 2010 | Differing from most basal boreosphenidans in the following features (+ = apomorphy; − = plesiomorphy): lower molars with a paraconid tall relative to metaconid (+), a well-developed paracristid and carnassial notch (+), and upper molars with a well-developed postmetacrista (+) (except deltatheroidans and stagodontids); reduction in size of the last lower molar (+) (except deltatheroidans and Glasbius); masseteric fossa on the mandible with a well-defined anteroventral margin distal to the tooth row (−), lower molars with a distal metacristid (−), a weak talonid basin with an absent or insignificant entoconid (−), and upper molars with a poorly developed protocone and conules (−) (except deltatheroidans and most stem boreosphenidans); and possession of four lower molars (−) (except metatherians and stem boreosphenidans). Differing from metatherians except deltatheroidans in: absence of a paraconid vertical keel and a hypoconulid postcingulid (−). Differing from all other deltatheroidans in: its larger size, p1 oriented oblique to the jaw axis (+) (except Deltatheridium; Kielan-Jaworowska, 1975), lower molars with a highly reduced metaconid (+), and upper molars with a procumbent protocone (+); upper molars with a shallower ectoflexus (+), smaller stylar shelf (+), and mesiodistally longer and transversely narrower protoconal region (+) (except Sulestes); and upper molars with a weak stylocone (+) and weak conules (−) (except Atokatheridium). Specifically, differing from Sulestes in: lower molars with a poorly developed or absent entoconid (−), narrower talonid (−), and greater height differential between trigonid and talonid (−). Differing from Deltatheroides in: p1 double-rooted (+). Differing from Atokatheridium and Oklatheridium in: much larger size and lower molars with greater height differential between trigonid and talonid (−). Differing from all mammals in: mandible with a large neurovascular (?) channel and foramen opening medial to the canine (Fox et al., 2007). |