Reinbergia Gründel, 2007b

Gründel, Joachim & Nützel, Alexander, 2013, Evolution and classification of Mesozoic mathildoid gastropods, Acta Palaeontologica Polonica 58 (4), pp. 803-826 : 804

Genus Reinbergia Gründel, 2007b

Emended diagnosis.—The majority of Mathildoidea have slender, high−spired shells and are of moderate to small size. The protoconch is heterostrophic. It consists of 1.5 to 3 sinistrally coiled whorls which are smooth in most species but may have axial ribs in some. The shell axis of the protoconch may be 90° (transaxial) to 180° (coaxial) to the axis of the teleoconch (see Schröder 1995 for terminology). The teleoconch ornament consists principally of several spiral ribs crossed by numerous axial ribs. Intersections between spiral and axial ribs may or may not be nodular. The teleoconch whorls are commonly angulated or keeled at one of the spiral ribs. Micro−ornaments occur in some genera. Some forms show a pronounced ontogenetic change of the teleoconch ornament including a changing position of the spiral ribs or a complete reduction of the ornament.