The species Lavocatia alfambrensis is known from the Barremian-age Camarillas Formation of Galve, Spain. This genus is apparently differentiated by the number of cusps on the tooth; 15. Also referred to in the reference is Peramura. This was a more "advanced" group of mammals, possibly ancestral to ourselves (see Peramus).
References
Canudo,J. I.; and Cuenca, G. (1996). "Two new mammalian teeth (Multituberculata and Peramura) from the Lower Cretaceous (Barremian) of Spain". Cretaceous Research, 17 (2), p. 215-228.URL visited may, 18, 2011
Kielan-Jaworowska Z & Hurum JH (2001), "Phylogeny and Systematics of multituberculate mammals". Paleontology44, p. 389-429.
Hahn, G., and R. Hahn (1999), "Pinheirodontidae n. fam. (Multituberculata, Mammalia) aus der tiefen Unter-Kreide Portugals". "Palaeontographica", 253(4/6), p. 77-222.