Definition of Leptagonia. Meaning of Leptagonia. Synonyms of Leptagonia

- Institellidae. The type species is Rugicostella" sakagamii Yanagida (1973). Leptagonia? lakhalensis Sp. nov Valid Popov in Ghobadi Pour et al. Devonian (Frasnian)...
- Beecheria Cleiothyridina Composita Desmoinesia Echinaria Hustedia Krotovia Leptagonia Linoproductus Neochonetes Phricodothyris Punctospirifer Schizophoria Plicochonetes...
- or unidentified related form †Leptaena †Leptaena rhomboidalis †Leptagonia †Leptagonia analoga †Leptellina †Leptobolus †Leptobolus occidentalis †Leptodesma...
-  France A member of Rhynchonellida belonging to the family Cyclothyrididae. Leptagonia franca Sp. nov Valid Mottequin & Simon Carboniferous (Tournaisian) Tournai...
- †Lepidasterella montanensis – type locality for species †Leptaena †Leptagonia †Leptagonia analoga †Leptalosia †Leptalosia scintilla – tentative report †Leptella...
- †Leiorhynchus w****si †Leiostegium †Leiostegium manitouense †Leptagonia †Leptagonia analoga †Leptagonia missouriensis †Leptograptus †Leptograptus demissus – type...
- Leptaena Leptaenisca Leptaenoidia Leptaenomenclax Leptaenopoma Leptaenopyxis Leptagonia Leptalosia Leptathyris Leptella Leptellina Leptelloidea Leptembolon Leptestia...
- †Lepdioproetus †Lepdioproetus xeo – type locality for species †Leptaena †Leptagonia †Leptocyrtoceras †Leptocyrtoceras curvatum †Leptocyrtoceras powellense...
- species †Leptaenisca †Leptaenisca concava †Leptaenisca irregularis †Leptagonia †Leptagonia analoga †Leptochirognathus †Leptochirognathus extensa †Leptodesma...
- †Leptaenisca †Leptaenisca irregularis – or unidentified comparable form †Leptagonia †Leptagonia missouriensis – type locality for species †Leptalosia †Leptalosia...