Ditretus rostellaria

Ditretus sp., cf. rostellaria (Buvignier, 1852) Plate 9: figs 1–4 ? 1931 Ditretus valenensis n. sp. – Yin: 46, pl. 4, figs 1–3. 2019 Ditretus sp., cf. rostellaria (Buvignier, 1852) – Gründel, Keupp and Lang: 110, pl. 4, figs 4–7. Material. 11 specimens, SNSB-BSPG 2016 XXI 1808 –1818. Description. The description is based on specimens with relatively stout shell shape; shell acutely trochiform, stout, with few whorls; last whorl higher than spire; a specimen is 23 mm high (apex missing); whorl face of spire whorl low; shell sides straight (side view); whorl face with subsutural row of large, rounded nodes (approximately 10 nodes per whorl) with steep adapical slope producing ramp that accentuates suture; whorls including nodes covered with numerous weak spiral lirae; transition from whorl face to base rounded; nodular spiral cord at transition to base and a weaker one below it are more or less clearly developed (probably intraspecific variation); base also covered with spiral lirae; fully grown specimens with distinctly widened, large and rounded aperture; inner and outer lip strongly thickened and broadened; columellar inner lip is also thickened and somewhat detached; short abapical canal hardly visible in apertural view because canal is almost closed. Remarks. Ditretus rostellaria Buvignier, 1852 differs in having whorls that are angulated at a row of nodes, its shell is more slender, the columellar inner lip is neither thickened nor detached according to the illustrations. Diatinostoma germaini Étallon sensu Yin (1931) largely lacks spiral cords and its aperture is unknown. Ditretus valenensis Yin, 1931 is similar (identical?) to the variant with a knobby spiral cord at the transition from whorl face to base. Ditretus thurmanni Loriol in Loriol and Koby sensu Gründel et al. (2022) is more slender and has more whorls.