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.

gollark: Yes, but it would foil someone who wasn't aware of potatOS mitigations.
gollark: It would require a more complex script.
gollark: If you just naively delete all potatOS files from computers without shutting them down first, they can do that.
gollark: Why not?
gollark: Alternatively, they can periodically check for file-on-disk existence, broadcast an alert on SPUDNET if something has been deleted, and hope it reaches other computers, which can then implement mitigations, first.

References
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