Ephippioceratidae is a family of
clydonatilacean nautilids with shells as in the
Liroceratidae
Liroceratidae is an extinct family of nautilids, shelled marine molluscs, belonging to the Clydonautiloidea, consisting of generally smooth, involute, nautiliconic forms with a small umbilicus. The whorl section is usually depressed and broadl ...
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 Pennsylvanian may refer to:
* A person or thing from Pennsylvania
* Pennsylvanian (geology)
The Pennsylvanian ( , also known as Upper Carboniferous or Late Carboniferous) is, in the International Commission on Stratigraphy, ICS geologic timesca ...
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
*Bernhard Kummel, 1964. Nautiloidea -Nautilida;
Treatise on Invertebrate Paleontology, Part K. Geol Soc of America and Univ of Kansas press, R.C. Moore (ed)
{{Taxonbar, from=Q5382221
Nautiloids
Mississippian first appearances
Cisuralian extinctions