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Acristatherium yanensis
Taxonomy
Acristatherium yanensis was named by Hu et al. (2010). Its type specimen is IVPP V15004, a skull (Partial skull with associated partial right lower jaw that bears nearly complete right upper and lower dentitions), and it is a 3D body fossil. Its type locality is Yanzigou, Shanyuan, which is in a Barremian/Aptian fluvial horizon in the Yixian Formation of China. It is the type species of Acristatherium.
Synonymy list
| Year | Name and author |
|---|---|
| 2010 | Acristatherium yanensis Hu et al. |
| 2010 | Acristatherium yanensis Zhou and Wang |
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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.
†Acristatherium yanensis Hu et al. 2010
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| Y. Hu et al. 2010 | Dental formula 4.1.5.3/3.1.5.3; canines large and singlerooted; P3/p2 smallest upper and lower premolars, respectively; p1 larger than p2; P5/p5 bearing a single principal cusp; stylar shelves of upper molars broad; ectoflexus deep; parastylar lobe much larger than metastylar one; paracone and metacone connate; protocone small; conules weak or absent; pre- and postcingula weak or absent; distolabial region of M3 reduced; paraconid of lower molar smaller and more labially positioned than metaconid; cusp e prominent; precingulid absent; talonid three-cusped, considerably shorter and narrower than trigonid; hypoconulid not shifted towards the entoconid; vestigial septomaxilla present; zygomatic arch slender; sagittal crest absent. |
Measurements
No measurements are available
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| Source: subc = subclass, c = class, subp = subphylum | |||||
| References: Lillegraven 1979, Ji et al. 2002, Carroll 1988, Hendy et al. 2009 | |||||
Age range: base of the Late/Upper Barremian to the top of the Early/Lower Aptian or 125.77000 to 119.57000 Ma
Collections: one only
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Late/Upper Barremian - Early/Lower Aptian | China (Liaoning) | Acristatherium yanensis (type locality: 55685) |