Keywords: ClevicerasExaratumType.png en Cleviceras exaratum - type specimen 1909-01-01 Biodiversity Heritage Library Buckman S S SS 1909 Yorkshire type ammonites 1 2 1909 1 Sydney Savory Buckman Arthur Morley Davies J W Tutcher Image is from publication in Public Domain as stated there http //dx doi org/10 5962/bhl title 45669 Image from the Biodiversity Heritage Library Digitized by Gerstein - University of Toronto archive org www biodiversitylibrary org other versions Custom license marker 2016 06 23 PD-old-70 Harpoceratinae |