Diagnoza

Unlike associated P₁ elements of N. vogesi, the platform develops gradually in the ontogeny, initially as a narrow crest on both sides of the blade base. Even if slightly concave occlusally in some specimens, it does not grade into morphologies typical for associated elements attributed to N. communis. It also never develops crenulation typical of associated elements of N. vogesi and N. biconstrictus. The elements P₂ with short processes and distinctly triangular outline with the denticle tips of the dorsal process arranged along a steeply dipping line.

Porównanie

The symmetry transition series elements are of rather generalised morphology. The S₀ elements T-shaped in occlusal  view seem to belong here, as opposed to those Y-shaped, which probably belong to Pandorinellina. Associated S₀ elements tentatively attributed to Siphonodella have a much shorter medial process. There is a gradual transition from N. communis to N. purus.

Autekologia

Występowanie geograficzne

Rhenish Slate Mountains, Dzikowiec in the Sudetes, Muhua section in Guzhou Province of China

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.