Initially regarded as a primitive member of Allosauroidea, it was later discussed as being closely related to Sinraptoridae, a more inclusive clade within Allosauroidea. Recently, some researchers have been favourable to the idea that L. antunesi is not even an allosauroid, but in fact a member of Megalosauroidea, a more primitive group of tetanuran theropods.
Initially thought to be a primitive member of Allosauroidea, it was later considered closely related to Sinraptoridae, which is a broader category within the same family. Recently, some researchers have suggested that L. antunesi may not belong to the allosauroid group at all but rather to Megalosauroidea, an older subgroup of tetanuran theropods.