Morphotype I MZ VIII Mg 4222/1 from the Bathonian of Blanowice; lateral view

Diagnoza

Shell elongate, about 2.5 times as high as broad. Suture weakly to deeply incised. Ornament consisting of, three granulated spiral cords, and straight axial ribs (9–12 ribs per whorl) together  forming distinct net of elongate  meshes  with distinct tubercles  at intersections. Later in ontogeny medial rib reduced.

Porównanie

C. armata is morphologically intermediate between C. quenstedti (Walther, 1951) and C. echinata (Buch, 1831). It differs from C. quenstedti by the reduction of the third, medial rib during ontogeny and from C. echina tain having the medial rib on the juvenile whorls. Two morphotypes of C. armata differs in having broader whorls of teleoconch and weakly incised sutures (in morphotype 1)

Autekologia

Występowanie geograficzne

Europe; in Poland Blanowice and Faustianka (Częstochowa region).

Zasięg czasowy

Early to Late Jurassic; in Poland Bathonian (Mid Jurassic).

Materiały muzealne

ZPAL and MZ: Five incomplete shells of morphotype 1 from Blanowice and two incomplete shells of morphotype 2 from Faustianka.

Literatura

Cossmann, M. 1913. Contributionsàla paléontologie Française des terrains jurassiques. III. Cerithiacea et Loxonematacea. Mémoires de la Société Géologique de France, série Paléontologie 46, 1–263.

Goldfuss, A.1841–1844. Petrefacta Germaniae, Dritter Theil. 128 pp. Arnz and Comp., Düsseldorf.

Gründel, J. 1997c. Zur Kenntis einiger Gastropoden − Gattung aus dem französischen Jura und allgemaine Bemerkungen zurGastropodenfauna aus dem Dogger Mittel− und Westeuropas. Berliner Geowissenschaftliche Abhandlungen, Reihe E25,69–129.

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