Specimen ZPAL Ga.9/238 from Callovian (Mid Jurassic) of the Łuków, in lateral view.

Diagnoza

Shell elongate, 2.0 times as high as broad. Protoconch hyperstrophic, ornamented by adapical and abapical axial folds. Teleoconch starting with four prominent spiral ribs; their number increasing during ontogeny (to six on the third whorl). The most adapical spiral rib and the following rib more widely spaced than the others. Whorls weakly angulated at most adapical spiral rib. Otherwise whorls rounded. Spiral ribs crossed by weaker, prosocline or weakly sigmoidal axial ribs (about 44–45 per whorl).

Porównanie

Differs from M. podlasiensis by having fewer spiral ribs and stronger and less numerous axial ribs. M. makowskii differs  in having equal distances between the spiral ribs and a more slender shell shape.

Autekologia

Występowanie geograficzne

Germany and Poland.

Zasięg czasowy

Callovian (Mid Jurassic).

Materiały muzealne

Material from Germany and three shells from Łuków (block in glacial drift), Poland.

Literatura

Gründel, J. 1997a. Heterostropha (Gastropoda) aus dem Dogger Norddeutschlands und Nordpolens. I. Mathildoidea (Mathildidae). Berliner Geowissenschaftliche Abhandlungen, Reihe E25, 131–175.

Kaim, A. 2004. The evolution of conch ontogeny in Mesozoic open sea gastropods. Palaeontologia Polonica 62, 3–183.