Acyon

Acyon; Temporal range:
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Class:	Mammalia
Order:	†Sparassodonta
Family:	†Hathliacynidae
Genus:	†Acyon; Ameghino, 1887
Type species
	Acyon tricuspidatus; Ameghino, 1897
Other species
	Acyon herrerae Marshall, 1981; Acyon myctoderos Forasiepi et al., 2006;

Acyon is an extinct genus of hathliacynid sparassodonts that lived in South America during the Miocene epoch.¹

Description

Acyon myctoderos is distinguished from Acyon herrerae by virtue of the former possessing less sectorial premolars than the latter and the former having a distinctive posterior cusp on the P₂ that the latter species lacks. A. myctoderos differs from both A. herrerae and Acyon tricuspidatus in that A. myctoderos has more vertically oriented hypoconulids and larger hypoconids on M_1-3.²

References

"Acyon". Paleobiology Database. Retrieved 3 May 2026.
Engelman, Russell K.; Anaya, Federico; Croft, Darin Andrew (1 April 2015). "New Specimens of Acyon myctoderos (Metatheria, Sparassodonta) from Quebrada Honda, Bolivia". Ameghiniana. 52 (2): 204. doi:10.5710/AMGH.19.11.2014.2803. ISSN 0002-7014. Retrieved 3 May 2026 – via BioOne Digital Library.

[1] "Acyon". Paleobiology Database. Retrieved 3 May 2026.

[2] Engelman, Russell K.; Anaya, Federico; Croft, Darin Andrew (1 April 2015). "New Specimens of Acyon myctoderos (Metatheria, Sparassodonta) from Quebrada Honda, Bolivia". Ameghiniana. 52 (2): 204. doi:10.5710/AMGH.19.11.2014.2803. ISSN 0002-7014. Retrieved 3 May 2026 – via BioOne Digital Library.

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