With the exception of "Lambis" and "Terebellum", the remaining taxa were previously allocated in the genus "Strombus", including "A. gigas". However, according to Simone, only "Strombus gracilior", "Strombus alatus" and "Strombus pugilis", the type species, remained within "Strombus", as they constituted a distinct group based on at least five synapomorphies (traits that are shared by two or more taxa and their most recent common ancestor). The remaining taxa were previously considered subgenera and were elevated to genus level by Simone. Genus "Eustrombus" (now considered a synonym of "Lobatus"), in this case, included "Eustrombus gigas" (now considered a synonym of "Aliger gigas") and "Eustrombus goliath" (= "Lobatus goliath"), which were thus considered closely related.