Rodzaj Balvia Lange, 1929
Gatunek typowy Opis Diagnosis. — Minute conch with internal shell thickenings and corresponding external constrictions forming anteriorly oriented saddle; umbilicus open at early growth stages. Synonimy Zasięg czasowy Literatura Dzik, J. 2006. The Famennian "Golden Age" of conodonts and ammonoids in the Polish part of the Variscan sea. Palaeontologia Polonica 63, 1-359. |
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