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Juchilestes liaoningensis
Taxonomy
Juchilestes liaoningensis was named by Gao et al. (2010). Its type specimen is Dalian Museum of Natural History 2607, a skull, and it is a 3D body fossil. Its type locality is Lujiatun village, Shangyuan [general] (other), which is in a Barremian/Aptian fluvial-lacustrine horizon in the Yixian Formation of China. It is the type species of Juchilestes.
Synonymy list
| Year | Name and author |
|---|---|
| 2010 | Juchilestes liaoningensis Gao et al. |
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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.
†Juchilestes liaoningensis Gao et al. 2010
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| C. -L. Gao et al. 2010 | Dentition I4, C1, P3, M5; i4, c1, p3, m6. Among all known eutriconodonts, Juchilestes liaoningensis is most similar to Hakusanodon archaeus from the Early Cretaceous of Japan (Rougier et al. 2007b) in having only three premolariforms, a conspicuous gradient of size decrease in the more posterior molars and almost identical profiles of molar cusps in lingual and buccal views. Juchilestes and Hakusanodon differ in that the ultimate premolar cusp b is taller than cusp c in the former, but c is taller than b in the latter; the main cusp a of the ultimate premolar is vertical in the former, but reclined posteriorly in the latter. The m2–4 of Juchilestes has a more pronounced (albeit still low and obtuse) triangulation of cusps than in Hakusanodon. Each of the postcanines is 16 to 20 per cent smaller in Hakusanodon than in Juchilestes. Autapomorphies of Juchilestes include columnar and high crowned canines, a raised and arcuate alveolar margin of the lower incisors, lanceolate posterior incisors and a distinctive para-maxillary crest (for M. buccinator) on the facial part of the maxilla parallel to the alveolar margin of the upper postcanines. Juchilestes differs from triconodontids and jeholodentids in that the upper posterior molars are not implanted on the zygomatic root of the maxilla, and in the embrasure occlusion of the upper and lower molars. Juchilestes differs from tinodontids with obtuse-angled molars in having a single-rooted, columnar and erect lower canine, instead of a two-rooted canine with a lower and conical profile of the latter. |
Measurements
No measurements are available
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| Source: c = class, subp = subphylum, uc = unranked clade | |||||
| References: Hopson 1973, Hendy et al. 2009, Carroll 1988, Luo et al. 2003 | |||||
Age range: base of the Late/Upper Barremian to the top of the Early/Lower Aptian or 130.00000 to 122.46000 Ma
Collections: one only
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Late/Upper Barremian - Early/Lower Aptian | China (Liaoning) | Juchilestes liaoningensis (type locality: 73438) |