Alamosaurus
Alamosaurus (; meaning "Ojo Alamo lizard") is a genus of titanosaurian sauropod dinosaurs, containing a single known species, Alamosaurus sanjuanensis, from the late Cretaceous Period of what is now southern North America. Isolated vertebrae and limb bones indicate that it reached sizes comparable to "Argentinosaurus" and "Puertasaurus", which would make it the largest dinosaur known from North America. Its fossils have been recovered from a variety of rock formations spanning the Maastrichtian age of the late Cretaceous period. Specimens of a juvenile "Alamosaurus sanjuanensis" have been recovered from only a few meters below the Cretaceous-Paleogene boundary in Texas, making it among the last surviving non-avian dinosaur species.
Carcharodontosaurinae
Carcharodontosaurinae (from the Greek καρχαροδοντόσαυρος, "carcharodontósauros": "jagged-toothed lizards") was group of theropod dinosaurs known from the Aptian to the Cenomanian/Turonian of Africa and South America. The clade was first named in 2007 by Steve Brusatte and Paul Sereno. The subfamily consists of gigantic derived carcharodontosaurids, among the largest theropod dinosaurs known, comparable in size to "Tyrannosaurus". Carcharodontosaurinae is defined as the least inclusive clade containing "Carcharodontosaurus" and "Giganotosaurus". Within this subfamily is the tribe Giganotosaurini. This tribe was originally its own subfamily, Giganotosaurinae, which was erected by Rodolfo Coria and Philip J. Currie in 2006. In order to keep this clade within the subfamily Carcharodontosaurinae, Brusatte and Sereno renamed and reranked it as a tribe. Giganotosaurini is defined as all carcharodontosaurines that are closer to "Giganotosaurus" than to "Carcharodontosaurus".