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 classified as 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 proposed that L. antunesi might not be an allosauroid but rather part of Megalosauroidea, a more ancient group of tetanuran theropods.