Herpetotheriidae is an extinct family of metatherians, closely related to marsupials. Species of this family are generally reconstructed as terrestrial, and are considered morphologically similar to modern opossums. They are suggested to have been insectivores.Kurz C (2005) Ecomorphology of opossum-like marsupials from the Tertiary of Europe and a comparison with selected taxa. Kaupia 14: 21–26. Fossils of herpetotheriids come from North America, Asia, Europe, Africa, and perhaps South America. The oldest representative is Maastrichtidelphys from the latest Cretaceous (Maastrichtian) of the Netherlands and the youngest member is Amphiperatherium from the Middle Miocene of Europe. The group has been suggested to be paraphyletic, with an analysis of petrosal anatomy finding that North American Herpetotherium was more closely related to marsupials than the European Peratherium and Amphiperatherium.
The family includes the following genera: Amphiperatherium (Early Eocene to Middle Miocene, Europe; synonyms: Oxygomphius, Microtarsioides, Ceciliolemur) Asiadidelphis (Late Eocene to Early Oligocene, Kazakhstan and Pakistan) Copedelphys (Late Eocene to Early Oligocene, North America) Entomacodon (Middle Eocene, North America; synonym: Centracodon) Golerdelphys (Late Paleocene, North America)Thomas E. Williamson; Donald L. Lofgren (2014). "Late Paleocene (Tiffanian) metatherians from the Goler Formation, California". Journal of Vertebrate Paleontology 34 (2): 477–482. doi:10.1080/02724634.2013.804413. Galatiadelphys (Middle Eocene, Turkey) Herpetotherium (Early Eocene to Middle Miocene, North America) Maastrichtidelphys (Maastrichtian, Europe) Nortedelphys (Lancian, North America) Peratherium (Early Eocene to Early Miocene, Europe; Early Oligocene, Egypt, Oman; synonyms: Alacodon, Qatranitherium) Swaindelphys (Early Paleocene, North America) Morotodon (Early to Middle Miocene, Uganda, placement in the family tentative)
The following genera have been placed in the family, but their placement is disputed or obsolete: Garatherium (Early Eocene of Algeria) – possibly an adapisoriculid eutherian Indodelphis (Early Eocene of India) – originally referred to Peradectidae Jaegeria (Early Eocene of India) – a bat Rumiodon (Paleogene of Peru) – placement uncertain
Cladogram after Ladevèze et al 2020:, showing a paraphyletic Herpetotheriidae.Cladogram after Gernelle et al. 2026:
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