Ga
- †Gabbioceras
- †Gabillytes
- †Gaetanoceras
- †Gagaticeras
- †Galaticeras
- †Galbanites
- †Gangadharites
- †Garantiana
- †Gargasiceras
- †Garniericeras
- †Garnierisphinctes
- †Gastrioceras
- †Gastroplites
- †Gattendorfia
- †Gattenpleura
- †Gaudryceras
- †Gaurites
- †Gauthiericeras
- †Gazdaganites
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