Holotype BGR X 5200 from Late Oxfordian of Kłęby in apertural and. lateral view.

Diagnoza

The protoconch is heterostrophic and  shell is spindle-like. The whorls of the spire are moderately convex. The convexity is larger in the adapical than in the abapical part of the whorls. A narrow ramp is present on the adapical part of the whorl. The last whorl is broadly convex and ornamented by a groove at the ramp and another groove located at the border with the base, which is otherwise not clearly demarcated from the lateral flanks. The lower part of the base is ornamented by three spiral grooves with wide interspaces, and about nine spiral grooves below. The aperture is drop-like, with the inner lip expanded at the junction of the columellar and parietal regions. A distinct umbilical chink is developed.

Porównanie

The most similar to Sulcoactaeon erratica erratica Gründel, 1997 from Callovian erratic boulders and boreholes of northern Germany and Poland but the latter differs in having more numerous spiral grooves in the lower part of the whorls and stronger prosocyrtic growth lines. It is possible that S. erratica erratica is a morphotype of S. viadrinus.

Autekologia

Występowanie geograficzne

Kłęby (Western Pomerania) 

Zasięg czasowy

Late Oxfordian (Late Jurassic)

Materiały muzealne

Only holotype (BGR).

Literatura

Gründel, J & Kaim, A. 2006. Shallow-water gastropods from Late Oxfordian sands in Kłęby (Pomerania, Poland). Acta Geologica Polonica 56, 2, 121-157.

Schmidt, M. 1905. Über Oberen Jura in Pommern. Abhandlungen der Königlich Preußsischen Geologischen Landesanstalt und Bergakademie, Neue Folge, 41, 1-222.