NHMW 1867/0008/0041 (original illustration from Laube, 1867: pl. 1, fig. 12 - holotype of Mathilda euglypha Laube) from Mid Jurassic of Balin in apertural view

Diagnoza

The rather slim shell bears a strong keel a little below the center of the coils. Adapically to the keel are two strong spiral ribs. A third, particularly strong one lies between the keel and the abapical seam. Very numerous, weakly opisthocyte axial ribs (located at the rearmost point on the keel) run from seam to seam and have crenulated spiral ribs and keel. A strong spiral rib located in the seam on the base is followed by three equally strong and several weak spiral ribs. The aperture is broad and oval.

Porównanie

Genus Euglypha is said to have conspicuously keeled coils and also to differ in the number of spiral ribs.

Autekologia

Występowanie geograficzne

Balin, Poland.

Zasięg czasowy

Mid Jurassic.

Materiały muzealne

Specimens from France and 1 specimen from Balin (NHMW 1867/0008/0041).

Literatura

Gründel, J. 2012. Neubearbeitung der von Laube 1867 beschriebenen Gastropoden fauna aus dem mittleren Jura von Balin/Polen. Annalen des Naturhistorischen Museums in Wien. Serie A, 114, 193–288.

Hébert, M. & Eudes-Deslongchamps, E.1860. Mémoire sur les fossiles de Montreuil-Bellay (Maine-et-Loire), 1re partie. Céphalopodes et Gastéropodes. Bulletin de le Société Linnéenne de Normandie, 5, 153–240.

Laube, G. C. 1867. Die Gastropoden des braunen Jura von Balin. Denkschriften der kaiserlichen Akademie der Wissenschaften, 28, 1–28.