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About: Masonoceras     Goto   Sponge   NotDistinct   Permalink

An Entity of Type : dbo:Species, within Data Space : dbpedia.demo.openlinksw.com associated with source document(s)

Type: ThingEukaryoteAnimalMolluscaanimaleukaryotemolluscaspecies New Facet based on Instances of this Class

Masonoceras is a genus of Karagondoceratids from Lower Mississippian strata, the shell of which is thinly subdiscoidal to discoidal with an acute ventral margin in late ontogeny. Whorls are strongly embracing, umbilicus narrow to occluded. The mature external suture contains a wide trifid ventral lobe, the flanking prongs longer that the medial, an asymmetrically rounded lateral saddle and a deeper asymmetric pointed lateral lobe. Internal molds of the type, Mesoceras Kentuckiense show presence of a broad hyponomic sinus flanked by high rounded vantrolateral salients.