- to Troedssonoceras.
Ormoceras also gave rise to
later genera such as
Metarmenoceras from the
Lower Devonian of Quebec,
either directly or
through Cyrtactinoceras...
- †Metabaltoceras †Metacoceras †Metactinoceras †Metaphragmoceras †Metarizoceras †
Metarmenoceras †Metaspyroceras †Metastromatoceras †Metephippiorthoceras †Metrioceras...
- (from
early Armenoceratid) Ormoceratidae,
Seamann 1853, Ormoceras,
Metarmenoceras, Parormoceras, Troedssonoceras........ Kroger, B; Yun-Bai,
Zhang (2008)...
