Basic info Taxonomic history Classification Relationships
Morphology Ecology and taphonomy External Literature Search Age range and collections

Acyon

Mammalia - Sparassodonta

Taxonomy
Acyon was named by Ameghino (1887) [title: Enumeracion sistematica de las especies de mamiferos fosiles coleccionados por Carlos Ameghino en los terrenos eocenos de la Patagonia austral y depositados en el Museo La Plata]. Its type is Acyon tricuspidatus.

It was synonymized subjectively with Cladosictis by Marshall (1978); it was synonymized subjectively with Anatherium by Marshall (1981).

It was assigned to Acyonidae by Ameghino (1894); and to Hathliacynidae by Forasiepi et al. (2006).

Synonymy list
YearName and author
1887Acyon Ameghino p. 8
1894Acyon Ameghino p. 140
2006Acyon Forasiepi et al.

Is something missing? Join the Paleobiology Database and enter the data

RankNameAuthor
kingdomAnimalia()
Triploblastica
Nephrozoa
Deuterostomia
phylumChordataHaeckel 1847
subphylumVertebrata
superclassGnathostomata
Osteichthyes()
Sarcopterygii
subclassDipnotetrapodomorpha(Nelson 2006)
subclassTetrapodomorpha()
Tetrapoda()
Reptiliomorpha
Anthracosauria
Batrachosauria()
Cotylosauria()
Amniota
Synapsida()
RankNameAuthor
Therapsida()
infraorderCynodontia()
Epicynodontia
infraorderEucynodontia
Probainognathia
Mammaliamorpha
Mammaliaformes
classMammalia
Theriamorpha(Rowe 1993)
Theriiformes(Rowe 1988)
Trechnotheria
Cladotheria
Boreosphenida()
subclassTheria
subclassMetatheria()
orderSparassodonta()
subfamilyHathlyacininae()
genusAcyonAmeghino 1887

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
A. M. Forasiepi et al. 2006largest known hathliacynid (length of skull up to 180 mm; for other hathliacynids see Marshall, 1981); dentary long, low, and gracile; large diastemata separating p1 from canine and p2; premolars strongly laterally compressed; talonids of m1–m3 without entoconid (autapomorphy, character 45).