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Acristatherium yanensis

Mammalia -

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 an Aptian fluvial horizon in the Yixian Formation of China. It is the type species of Acristatherium.

Synonymy list
YearName and author
2010Acristatherium yanensis Hu et al.
2010Acristatherium yanensis Zhou and Wang

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RankNameAuthor
kingdomAnimalia()
Triploblastica
Nephrozoa
Deuterostomia
phylumChordataHaeckel 1847
subphylumVertebrata
superclassGnathostomata
Osteichthyes()
Sarcopterygii
subclassDipnotetrapodomorpha(Nelson 2006)
subclassTetrapodomorpha()
Tetrapoda()
Reptiliomorpha
Anthracosauria
Batrachosauria()
RankNameAuthor
Cotylosauria()
Amniota
Synapsida()
Therapsida()
infraorderCynodontia()
Epicynodontia
infraorderEucynodontia
Probainognathia
Mammaliamorpha
Mammaliaformes
classMammalia
subclassTribosphenida()
infraclassEutheria()
genusAcristatherium
speciesyanensis

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.

Diagnosis
ReferenceDiagnosis
Y. Hu et al. 2010Dental 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
Composition: phosphaticsubp
Environment: terrestrialsubc
Locomotion: actively mobilec
Life habit: scansorialsubc
Diet: insectivoreuc
Created: 2005-09-06 20:43:42
Modified: 2005-09-06 22:44:32
Source: subc = subclass, c = class, subp = subphylum, uc = unranked clade
References: Luo et al. 2003, Carroll 1988, Hendy et al. 2009, Ji et al. 2002

Age range: Early/Lower Aptian or 125.45000 to 122.46000 Ma

Collections: one only


Time interval Ma Country or state Original ID and collection number
Early/Lower Aptian125.45 - 122.46China (Liaoning) Acristatherium yanensis (type locality: 55685)