| Helohyidae Temporal range:
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|---|---|
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| Reconstruction of the skull of Achaenodon | |
Scientific classification 
| |
| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Mammalia |
| Order: | Artiodactyla |
| Family: | †Helohyidae Marshall, 1877 |
| Species | |
Helohyidae were a group of artiodactyl mammals.[1][2] They were most prominent in the mid-to-upper Eocene (~50 to 39 million years ago).
- ^ Ducrocq, Stéphane; Chaimanee, Yaowalak; Suteethorn, Varavudh; Jaeger, Jean-Jacques (September 1997). "First discovery of Helohyidae (Artiodactyla, Mammalia) in the Late Eocene of Thailand: a possible transitional form for Anthracotheriidae". Comptes Rendus de l'Académie des Sciences - Series IIA - Earth and Planetary Science. 325 (5): 367–372. Bibcode:1997CRASE.325..367D. doi:10.1016/S1251-8050(97)81385-7.
- ^ "Fossilworks: Helohyidae". fossilworks.org.