Diagnoza

The initial part of the shell is discoidal. The shape of adolescent specimens is more rounded than that of the juveniles and the keel becomes as strong as the other spiral ribs. The nodes located in the adapical part of the adult whorls are hollowed in their terminal parts and form incipient spines. The umbilicus is narrow, surrounded by a sturdy and heavily noded spiral rib. The aperture is rounded with the inner lip being slightly expanded. The inner lip is reflected outward, especially in its abapical part.

Porównanie

Delphinula muricata Buvignier var. alsatica Andreae, 1887 differs in having a broader shell, a more strongly developed upper row of thorn-like nodes, and a base with only four spiral ribs. Metriomphalus segregatus (Hebert & Eudes-Deslongchamps, 1860) sensu Gerasimov (1992) is quite similar to and possibly conspecific with M. muricatus.

Autekologia

Występowanie geograficzne

Boulogne-sur-Mer In France and Kłęby (Western Pomerania) in Poland.

Zasięg czasowy

late Oxfordian.

Materiały muzealne

9 specimens (collections BGR i Buchholz).

Literatura

Buvignier, A. 1843. Mémoire sur quelques fossiles nouveaux des dépatements de la Meuse et des Ardennes. Mémoires de la Société Philomatique de Verdun (Meuse), 2, 225‒252.

Dmoch, I. 1971. Osady i fauna górnojurajska z Kłębów na Pomorzu Zachodnim. Studia Societatis Scientarum Torunensis. Sectio C (Geographia et Geologia), 7, 1‒60.

Gründel, J & Kaim, A. 2006. Shallow-water gastropods from Late Oxfordian sands in Kłęby (Pomerania, Poland). Acta Geologica Polonica 56, 2, 121‒157.

Schmidt, M. 1905. Über Oberen Jura in Pommern. Abhandlungen der Königlich Preußsischen Geologischen Landesanstalt und Bergakademie, Neue Folge, 41, 1-222.