Amphiscapha

Amphiscapha is a fossil gastropod mollusk, or less likely a monoplacophoran, genus from the Pennsylvanian and Lower Permian of North and South America, included in the family Euomphalidae. It is sometimes regarded as a subgenus of Straparollus, S. (Amphiscapha) Knight 1942

Amphiscapha Temporal range: Penn - L Perm
Scientific classification
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Gastropoda or ?Monoplacophora
Superfamily:	Euomphaloidea
Family:	Euomphalidae
Genus:	Amphiscapha J.B. Knight, 1942

Description

The shell in this genus is hyper strophic discoidal, with a flat base and a concave upper side. The location of what is presumed to be the exhalent channel is marked by a smooth or rugose ridge along the upper-outer margin, which lies along the edge of a flat to concave outer rim.

References

• J. B. Knight et al. 1960. Systematic descriptions; Treatise on Invertebrate Paleontology; Part I, Mollusca(1): I192.
• Paleobiology database info on Amphiscapha