The genus Ecprepaulax was named by Hahn G. and Hahn R. in 1999 based on a single species Ecprepaulax anomalaFossil remains were found in Berriasian (Lower Cretaceous) strata in Portugal. The species is a multituberculate mammal within the informal suborder of "Plagiaulacida".
References
Hahn & Hahn (1999), Pinheirodontidae n. fam. (Multituberculata) (Mammalia) aus der tiefen Unter-Kreide Portugals. Palaeontographica A, 253, p. 77-222.
Kielan-Jaworowska Z & Hurum JH (2001), "Phylogeny and Systematics of multituberculate mammals". Paleontology44, p. 389-429.
Much of this information has been derived from [1] MESOZOIC MAMMALS: Basal Multituberculata, an Internet directory.