Schlotheimia
Schlotheimia is a genus of extinct cephalopods belonging to the subclass Ammonoidea that lived during the Hettangian stage at the beginning of the Early Jurassic. Description. The shell, or conch, of "Schlotheimia" rather evolute, coiled with all whorls exposed and only slightly embracing. The umbilicus is perforate as with more finely ribbed "Angulaticeras". whorls are compressed, bearing ribs that cross the venter in chevrons, less developed in "Sulciferites" Distribution. Fossils of "Schlotheimia" species have been found in Lower Jurassic rocks of Argentina, Austria, Belgium, Canada, France, Germany, Indonesia, Italy, Luxembourg, Switzerland, United Kingdom, United States.