Specimen ZPAL Ga.9/226 from the Valanginian (Early Cretaceous) of Wąwał in lateral and apical view.

Diagnoza

iShell elongate, 2.3 times as high as broad. Protoconch hyperstrophic, diverging about 106° from teleoconch axis, smooth. Teleoconch starting with three prominent and one subsutural spiral rib. The latter is later submerged under following whorl. Whorls slightly angulated at spiral ribs. Spiral ribs crossed by weaker, prosocline axial ribs (about 41–42 per whorl).

Porównanie

lMost similar to M. makowskii which has four spiral ribs and more rounded whorls. Also similar to M. striatissima but distinctly angulated whorls and the number of its spiral ribs increases during ontogeny.

Autekologia

Występowanie geograficzne

Germany and Poland; in Poland only in Wąwał near Tomaszów Mazowiecki and Łuków (block in glacial drift).

Zasięg czasowy

Bajocian, Mid Jurassic to Valanginian, Early Cretaceous

Materiały muzealne

27 shells from Wąwał and 14 shells from Łuków

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.

Walther, H. 1951. Jurassische Mikrofossilien, insbesondere Gastropoden, am Südrand des Hils. Paläontologische Zeitschrift 25, 35–106.