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Spalacotheriidae is a family of extinct mammals belonging to the paraphyletic group 'Symmetrodonta'. They lasted from the Early Cretaceous to the Campanian in North America, Europe, Asia and North Africa.

Temporal range: Early Cretaceous - Late Cretaceous, 145–70 Ma
Restoration of Yaverlestes
Scientific classification e
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Order: Symmetrodonta
Superfamily: Spalacotherioidea
Family: Spalacotheriidae
Marsh, 1887

See text

Spalacotheriids are characterised by having molar teeth with three molar cusps sitting at acute angles to one another.[1] The shape of their teeth as well as their long lower jaw indicate a carnivorous/insectivorous diet.[2]

There sub-group of Spalacotheriidae, the spalacolestines, lack a Meckelian groove in the jaw, indicating that they had a modern ear anatomy.[1]



  1. ^ a b Martin, T., 2018. 6. Mesozoic mammals—early mammalian diversity and ecomorphological adaptations. In Mammalian evolution, diversity and systematics (pp. 199-300). De Gruyter.
  2. ^ a b Han, Gang; Meng, Jin (2016). "A new spalacolestine mammal from the Early Cretaceous Jehol Biota and implications for the morphology, phylogeny, and palaeobiology of Laurasian 'symmetrodontans'". Zoological Journal of the Linnean Society. 178 (2): 343–380. doi:10.1111/zoj.12416.