Revision of Toxoceratoides royeri (d'Orbigny, 1842) and its bearing on the systematics of the Aptian Acrioceratidae Vermeulen, 2004 (Ammonoidea, Ancyloceratina, Ancyloceratoidea). Cretaceous Research, 88, Aug 2018: 187-196. 193 [Zoological Record Volume 154]