“…In addition, there is limited knowledge about the anatomy of several species (examples of skull descriptions in HOWELL, 1929;SIVERTSEN, 1954;REPENNING et al, 1971;KING, 1983;ANDREESCU;MURARIU, 1985;KASTELEIN;GERRITS, 1990;FERIGOLO, 1996a;MIZUNO;OHTAISHI, 2002;SANFELICE;FERIGOLO, 2008), and the frequent variability in the cranial (NOJIMA, 1990), postcranial (ROBINETTE;STAINS, 1970;ENGLISH, 1977) and dental (DREHMER; FERIGOLO, 1996b;DREHMER et al, 2004;CRUWYS;FRIDAY, 2006;LOCH et al, 2010) character states, which makes it even more difficult to clarify the relationships of this group.…”