| 词条 | Ephippioceratidae |
| 释义 |
| fossil_range = Miss - L Perm | image = | taxon = Ephippioceratidae | authority = Miller & Youngquist, 1949 }} 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. References
3 : Nautiloids|Mississippian first appearances|Cisuralian extinctions |
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