Treptoceras
# 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
