sentences:  It was not until 1998 that this group was defined as a clade by Paul Sereno.Sereno defined the group as all dromaeosaurids more closely related to "Velociraptor" than to "Dromaeosaurus".While several studies have since recovered a group of dromaeosaurids closely related to "Velociraptor", they vary widely regarding which species are actually velociraptorines and which are either more basal or closer to "Dromaeosaurus".