Original description of Struthiolaria convexa by Marwick, 1924:
- "Shell ovate, plump; spire acute, about same height as aperture; protoconch an elongated bulbous nucleus, at right angles to axis of shell; whorls 6, increasing rather rapidly, convex in outline; sculpture, first three conch-whorls have 11 regular spirals, with interstices of slightly greater width, on fourth whorl a single thread in most of interstices, on fifth and sixth whorls secondary threads rapidly increase in number, generally 1 on each side of and close to primaries, with 1 or more in wide interspaces; suture with a flattened border on first four whorls and in shallow channel on last two; aperture ovate, channelled above, produced below into very short widely-open canal; outer lip reflexed, thickened, edge rounded, sinuosity very shallow; columella concave, ending in beak bent to right; inner lip with fairly regular callus, equal in width to and hardly ascending above junction with outer lip."
Locus typicus: Porangahau Creek, Ruataniwha Plain, Hawke’s Bay Region, North Island, New Zealand
Struthiolaria (Pelicaria) convexa (Marwick, 1924); Nukumaruan, Pliocene/Pleistocene; Dannevirke, North Island, New Zealand; 37 mm; Coll. BM(NH); Copyright BM(NH)
Struthiolaria (Pelicaria) convexa (Marwick, 1924); Nukumaruan, Pliocene/Pleistocene; Dannevirke, North Island, New Zealand; 32 mm; Coll. BM(NH); Copyright BM(NH)
Struthiolaria convexa (Marwick, 1924); Holotype; In Marwick, Pl. 15, fig. 3 and 4; Copyright Royal Society of New Zealand / National Library of New Zealand
- J. Marwick (1924) – The Struthiolariidae. Transactions and Proceedings of the Royal Society of New Zealand, Vol. 55, p. 188, Pl. 15, fig. 3 and 4