Clarkoceras affine- Clarkoceras arcuatum
- Clarkoceras buttsi
- Clarkoceras calvini
- Clarkoceras cinctum
- Clarkoceras confertum
- Clarkoceras crassum
- Clarkoceras cuneatum
- Clarkoceras curvatum
- Clarkoceras expansum
- Clarkoceras gracile
- Clarkoceras huzzahense
- Clarkoceras inconstans
- Clarkoceras jasperense
- Clarkoceras luthei
- Clarkoceras magnisiphonatum
- Clarkoceras minneiskense
- Clarkoceras modestum
- Clarkoceras multicameratum
- Clarkoceras parvisiphonatum
- Clarkoceras rectum
- Clarkoceras ruguliferum
- Clarkoceras subarcuatum
- Clarkoceras subcrassum
- Clarkoceras subrectum
- Clarkoceras vicinum
- Clarkoceras whitehallense
- Piloceras newtonwinchelli