Neopolygnathus subplanus (Voges, 1959) from the Tournaisian Wapnica beds of Dzikowiec in the Sudetes.

Apparatus composition of Neopolygnathus subplanus.

Diagnoza

Most P₁ elements in the population have their platform margin gently bent upward; only those with a thin, wide platform, have them almost flat.

Porównanie

The most robust mature elements develop tuberculation that in extreme cases consists of oblique rounded ridges, resembling those in N. vogesi but not elevated above the tubercles following them externally. Sometimes these are incipient transverse ridges but the low tubercles constricting the furrows of the platform, so typical for N. communis, do not develop in clearly identifiable form. In some populations numerous P₁ elements have margins of the platform strongly curved to reach almost the morphology of N. communis. There is, however, no morphologic discontinuity in the morphologic variation of the elements that would suggest a real presence of separate species.

Autekologia

Występowanie geograficzne

Zasięg czasowy

Tournaisian

Materiały muzealne

ZPAL

Literatura

Dzik, J. 1997. Emergence and succession of Carboniferous conodont and ammonoid communities in the Polish part of the Variscan sea. Acta Palaeontologica Polonica 42, 57-170.