Diagnoza

In the population from sample Dz-65 virtually all elements have their platform margin bent upward. Only a few per cent of them, those with a thin, wide platform, have them almost flat. 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 extemally. 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 of the species (for instance Dz-66) numerous sp 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.

The type population of the subspecies comes from 82-97 cm below the top of the Hangenberg Limestone at Hdnnetal.

Porównanie

Autekologia

Występowanie geograficzne

Zasięg czasowy

Materiały muzealne

Literatura