New taxonomic data for the gastropod fauna of the Umzamba Formation (Santonian–Campanian, South Africa) based on newly collected material

From the type section of the Umzamba Formation in the Eastern Cape Province of South Africa 37 gastropod species are described; 11 of these are new species, five are described in open nomenclature. Two new genera are introduced: Schizofusus gen. nov. (higher Caenogastropoda) for a shell resembling Schizobasis but having a rounded basal slope and a straight siphonal canal of moderate length, and Muteluma gen. nov. (Turridae) for a high-spired, fusiform shell with convex and rounded whorls, and a shallow anal sinus on the flank of the whorls. The presence of the turritellid Spirocolpus in the Umzamba Formation suggests a Late Cretaceous Southern Hemisphere origin for that group of turritellids with a very deep sinus in their growth lines. The protoconch of Blackdownia acuticarinata is documented and resembles that of the Capulidae rather than the Muricidae, where Blackdownia had previously been placed. Also in shape of the teleoconch, the genus resembles the capulid Trichotropis and is, therefore, transferred to the Capulidae. The type species of the monotypic Pirula (Protopirula) is identified as a juvenile cypraeid; Protopirula is, therefore, considered synonym with Cypraea. The new species are Solariella griesbachi, Iravadia (Pseudonoba) ponderi, Gyrodes (Dockeryella) renniei, Gyrodes (Sohlella) woodsi, Blackdownia kollmanni, ‘Calyptraea’ primogenita, Galeodea (Taieria) klingeri, Trophon? umzambiensis, Muteluma convexa, Paleopsephaea? compacta, Boltenella? africana, and Schizofusus transkeiensis.