Grabinopsis, Krawczyński, 2002

Krawczyński, Wojciech, 2002, Frasnian gastropod synecology and bio-events in the Dyminy reef complex of the Holy Cross Mountains, Poland, Acta Palaeontologica Polonica 47 (2), pp. 267-288 : 278

Family? Plagiothyridae Knight, 1956 Genus Grabinopsis gen. nov.

Type species: Grabinopsis guerichi sp. nov.

Type horizon and locality: the inactive quarry “Grabina” (W part of Kielce), set B, the upper Sitkówka Beds , middle Frasnian .

Derivation of the name: from type locality, Grabina.

Diagnosis.— Grabinopsis gen. nov. is charakterized by a rounded small shell with a low spire. Columallar lip with one prominent columellar fold. Ornamentation contains of two spiral angular ridges just below the suture. Grabinopsis gen. nov. differs from Dirachis Whidborne, 1891 by its lower spire and the single columellar fold. Other genera from the family Plagiothyridae ( Plagiothyra Whidborne, 1892 and Littorinides Knight, 1937 ) have much higher turbiniform shells, anomphalous bases, and more developed spiral ornamentation. The almost sphaerical shell is similar to the shell of Naticopsis M’Coy, 1844 but the last whorl of Grabinopsis has a higher an aperture as well as aperture expanded in a direction perpendicular to the axis of the shell. Grabinopsis has a minutely phaneromphalous base and a spiral ornamentation not known in Naticopsis .

Remarks.—The naticiform shell, the presence of spiral ridges, and the prominent columellar fold suggest affinities with the family Plagiothyridae . However, some doubts are raised because of the absence of a well preserved last whorl, growth lines, and due to unknown nature of the protoconch.

Species assigned.—Only the type species.