Alocolytoceratinae is a subfamily of lytoceratids that comprises genera characterized by many deep constrictions in the shell resulting in capricorn-like (goat's horm) ornamention, especially in the middle whorls, but becoming smooth and more involute in the outer whorls. Saddle endings in the suture tend to be phylloid, (leaf-like). Alcolytocerainae includes Alocolytoceras, Lobolytoceras, , and , which are mostly from the Toarcian. One genus, Pachylotoceras, extends into the lower Bajocian.