Revised stratigraphic range of the Toarcian ammonite genus Porpoceras Buckman, 1911 Author Jattiot, Romain Author Fara, Emmanuel Author Brayard, Arnaud Author Vennin, Emmanuelle text Geodiversitas 2016 2016-12-30 38 4 505 513 http://dx.doi.org/10.5252/g2016n4a3 journal article 10.5252/g2016n4a3 1638-9395 5208344 urn:lsid:zoobank.org:pub:BC8394F4-9DF1-458A-B9A1-4293D82962EE Genus Porpoceras Buckman, 1911 TYPE SPECIES . — Ammonites vortex Simpson, 1855 by monotypy.