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Machaeroidinae; Temporal range: 52.4–39.7 Ma PreꞒ Ꞓ O S D C P T J K Pg N early to middle Eocene
	skull cast of Machaeroides eothen
	lower jaw of Apataelurus kayi
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Class:	Mammalia
Clade:	Pan-Carnivora
Order:	†Oxyaenodonta
Family:	†Oxyaenidae
Subfamily:	†Machaeroidinae; Matthew, 1909
Type genus
	†Machaeroides; Matthew, 1909
Genera
	†Apataelurus; †Diegoaelurus; †Isphanatherium; †Machaeroides; Incertae sedis: †Machaeroidinae sp. (CM 2386); †Machaeroidinae sp. (FMNH PM 1506); †Machaeroidinae sp. (USNM 173514); ;
	A map showing the fossil finds of machaeroidinid genera.
Synonyms
	list of synonyms: Machaeroididae ; Machaeroidini (Van Valen, 1966) ; Machairoidinae (Matthew, 1909) ;

Machaeroidinae ("dagger-like") is an extinct subfamily of carnivorous sabre-toothed placental mammals from extinct family Oxyaenidae, that lived from the early to middle Eocene of Asia and North America.^[3] Traditionally classified as hyaenodonts, this group is now classified as a member of the family Oxyaenidae.^[4]^[5]^[6]

Classification and phylogeny

^ W. D. Matthew (1909.) "The Carnivora and Insectivora of the Bridger Basin, middle Eocene." Memoirs of the American Museum of Natural History 9:289-567
^ L. Van Valen (1967.) "New Paleocene insectivores and insectivore classification." Bulletin of the American Museum of Natural History 135(5):217-284
^ Malcolm C. McKenna, Susan K. Bell: Classification of Mammals: Above the Species Level in Columbia University Press, New York (1997), 631 Seiten. Machaeroidinae
^ Zack, S. (2014). "Saber-tooth origins: a new skeletal association and the affinities of Machaeroidinae (Mammalia, Creodonta)". Journal of Vertebrate Paleontology, Program and Abstracts: 259–260.
^ Shawn P. Zack (2019). "A skeleton of a Uintan machaeroidine 'creodont' and the phylogeny of carnivorous eutherian mammals". Journal of Systematic Palaeontology. 17 (8): 653–689. doi:10.1080/14772019.2018.1466374. S2CID 89934728.
^ Shawn P. Zack (2019). "The first North American Propterodon (Hyaenodonta: Hyaenodontidae), a new species from the late Uintan of Utah". PeerJ. 7: e8136. doi:10.7717/peerj.8136. PMC 6876642. PMID 31772846.
^ Zack, Shawn P.; Poust, Ashley W.; Wagner, Hugh (2022-03-15). "Diegoaelurus, a new machaeroidine (Oxyaenidae) from the Santiago Formation (late Uintan) of southern California and the relationships of Machaeroidinae, the oldest group of sabertooth mammals". PeerJ. 10: e13032. doi:10.7717/peerj.13032. ISSN 2167-8359. PMC 8932314. PMID 35310159.