Hoploscaphites Nowak, 1911

Landman, Neil H., Kennedy, W. James, Grier, Joyce, Larson, Neal L., Grier, James W., Linn, Thomas, Tackett, Lydia & Jicha, Brian R., 2020, LARGE SCAPHITID AMMONITES (HOPLOSCAPHITES) FROM THE UPPER CRETACEOUS (UPPER CAMPANIAN – LOWER MAASTRICHTIAN) OF NORTH AMERICA: ENDLESS VARIATION ON A SINGLE THEME, Bulletin of the American Museum of Natural History 2020 (441), pp. 1-131 : 1-131

Genus Hoploscaphites Nowak, 1911

[= Mesoscaphites Atabekian, 1979: 523 (nomen nudum) fide Kennedy, 1986; Wright, 1996; Jeletzkytes Riccardi, 1983: 14 ]

TYPE SPECIES: Ammonites constrictus J. Sowerby (1817: 189, pl. A, fig. 1), by original designation.

DIAGNOSIS: “Small to large scaphites, strongly dimorphic, with broad variation in degree of whorl compression ranging from slender to robust, with involute phragmocone, short to long shaft, and weakly recurved hook; apertural angle ranging from approximately 35° to 85°; aperture constricted with dorsal projection; ribs straight to flexuous, increasing by branching and intercalation, with weak to strong adoral projection on venter; adult shell with or without umbilicolateral, flank, and ventrolateral tubercles; suture fairly indented, with symmetrically to slightly asymmetrically bifid first lateral lobe” (Landman et al., 2010: 93).