As for Smithian Taxonomy on this web page, all ammonoids are nominal.
Because of the variable morphology in some populations all specimens are a seperate species, or all are one specie with variable morphology.  Mathews (1929) described (a) 32 species of Anasibirites, 5 species of Gurlyeites, 9 of Hemiprionites "Goniodiscus" and 1 of  Kashmirites, and (b) 4 species of  Wasatchites, 3 of Kashmirites and 1 of Keyserlingites, from Cephalopod Gulch near Salt Lake City, Utah.  Later workers placed alot of them (a) in synonomy with Anasibirites kingianus (Waagen) and (b) in Wasatchites.  In the Anasibirites Beds (about 300mm thick) of the Confusion Range of western Utah. there are representatives of all these genera, they grade from Hemiprionites to Anasibirites to Gurleyites to Arctoprionites to Wasatchites with intermediates between each.  To use a typological taxonomy would mean many new species, to use a population taxonomy would mean one or two species.  Given the short duration of the Smithian and the difference between the faunas of the Meekoceras and Anasibirites zones it seems best to refer all to nominal species (with generic modifiers in quotes on some just to tell what the specimen looks like).  So for the time being most Prionitid ammonoids from the Anasibirites beds on this site are lumped into two species, Anasibirites multiformis Welter 1922, and Wasatchites perrini Mathews 1929.  (See the two papers by E.T. Tozer 1971 and 1994 for more).