Gatunek typowy

Ligonodina franconica Sannemann, 1955 from the Cheiloceras Stufe of Frankenwald.

Opis

S1 and S2 elements in the apparatus triramous. Morphology of P series and M elements of the oldest species of this genus is similar to that of Vogelgnathus variabilis sp. n., which appears somewhat earlier in the Holy Cross Mountains Famennian. Although the transition remains to be demonstrated, it seems likely. Poorly preserved specimens resembling F. santacrucensis sp. n. occur at Wietrznia in sample Wtr-19 representing the late K. triangularis Zone. Triramous elements are missing among them and it is possible, although far from proven, that they represent the ancestral population of the lineage.

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.