title: Treptoceras
text: # Treptoceras
  
  Treptoceras is a fossil cephalopod genus included in the orthocerid family Proteoceratidae.
  
  ## Fossil record
  
  It has been found in Ordovician rocks dated from about 460.9 to 445.6 Ma in South Korea and United States.
  
  ## Species
  
  * †Treptoceras cincinnatiensis Miller 1875
  * †Treptoceras duseri Hall and Whitfield 1875
  * †Treptoceras fosteri Miller 1875
  * †Treptoceras transversum Miller 1875
  * †Treptoceras yokoyamai Kobayashi 1927
  