The remains of Nigersaurus were initially described in 1976 as belonging to a dicraeosaurid, but in 1999 Sereno's team reclassified it as a rebbachisaurid diplodocoid [REF].
The closely related genus Demandasaurus from Spain was described in 2003, and along with other animal groups that span the Cretaceous of Africa and Europe, this indicates that carbonate platforms connected these landmasses across the Tethys Sea [REF].