Gastropoda - Trochoidea - Ataphridae

PaleoDB taxon number: 202429

Diagnosis. Shell lens-shaped with two keels forming periphery; keels separated by a concave area; subsutural spiral rib; narrow ramp between spiral rib and adapical suture; indistinct axial ribs between subsutural spiral rib and adapical keel; base with narrow umbilicus and radial ribs that are con&64257;ned to the centre of the base; apertural edge with triangular broadening at the transition from the columella to the basal apertural edge.

Full reference: J. Gründel, A. Kaim, A. Nützel and C. T. S. Little. 2011. Early Jurassic Gastropods form England. Palaeontology 54(3):481-510

Belongs to Lensataphrus according to J. Gründel et al. 2011

Sister taxon: Lensataphrus tenuis

Type specimen: MG 1396 . Its type locality is Coast near Redcar, Cleveland, UK, which is in a Hettangian/Sinemurian marine horizon in the Redcar Mudstone Formation of the United Kingdom.

Ecology: epifaunal grazer

Average measurements (in mm): shell width 1.94