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Ephippioceratidae is a family of clydonati … Ephippioceratidae is a family of clydonatilacean nautilids with shells as in the Liroceratidae but with sutures that have deep ventral and dorsal saddles. This group, which contains two genera, Ephippioceras and Megaglossoceras, has a range from the Mississippian to the Lower Permian. Ephippioceras, which has the full range of the family, has a broad, narrowly peaked ( V-shaped) ventral saddle and may have been derived from Liroceras early in the Mississippian. Megaglossoceras from the Pennsylvanian of North America, with its large, broadly arched, tongue-like ventral saddle is an obvious offshoot of Ephippioceras. Both are subglobular and involute with a reniform whorl section. Ephippioceras has been found in North America, Europe, and China.found in North America, Europe, and China.
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