Pinheirodontidae is a poorly known family of fossil mammals within the order Multituberculata. Remains are known from the earliest Cretaceous of Europe, (predominantly Portugal and Spain), but are so far restricted to teeth. These small plant-eaters lived during the 'age of the dinosaurs'.
Taxon: Pinheirodontidae Hahn G & Hahn R, 1999
Page reference: Kielan-Jaworowska Z & Hurum JH (2001), Phylogeny and Systematics of multituberculate mammals. Paleontology 44, p.389-429.
(This information has been derived from [1] (http://home.arcor.de/ktdykes/plagiau.htm) MESOZOIC MAMMALS; Basal Multituberculata, an internet directory. As that's my webpage, there are no issues of copyright. Trevor Dykes)
Pinheirodontidae
Scientific classification
Kingdom: Animalia
Therapsida
Class: Mammalia
Order: Multituberculata
Family: Pinheirodontidae Genera
Pinheirodon
Bernardodon
Ecprepaulax
Gerhardodon
Iberodon
Lavocatia
Ref.
For the technically minded, they're part of the informal suborder of "Plagiaulacida".
Reference: Hahn & Hahn (1999), Pinheirodontidae n. fam. (Multituberculata) (Mammalia) aus der tiefen Unter-Kreide Portugals. Palaeontographica Abt. A Vol. 253, pp.77-222.
(Pinheirodontidae n. fam. (Multituberculata) (Mammalia) from the deepest Lower Cretaceous of Portugal).