Opis

Secondarily lost axial symmetry in P1 elements.

Classification of Siphonodella in this family is based on the assumption that in its apparatus P2 location was occupied by elements earlier classified as Elictognathus. P2 elements of Elictognathus morphology co-occur with ramiform elements of Dinodus, the generic name having priority. The Devonian elements with a morphology resembling Dinodus can hardly belong to an apparatus related to the Siphonodella lineage and probably are rather of prioniodinid affinities (Guizhoudella). The derived morphology of apparatus elements of Siphonodella probably did not originate before the Tournaisian. Possibly, the earliest elictognathids were quite different and their roots are to be looked for in Immognathus. 

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.