Polygnathus experplexus (Sandberg & Ziegler, 1979) from the L.styriacus Zone at Ostrówka in the Holy Cross Mountains and Dzikowiec in the Sudetes.

Apparatus composition of Polygnathus experplexus.

Diagnoza

P₁ elements with two tuberculated rostral ridges and lobate platform ornamented with tubercles.

Porównanie

The origin of the species remains unsettled. P₁ elements show some similarity to Hemilistrona perplexa, but the apparatus is rather different and its morphology may suggest an origin from Polygnathus praecursor. In early populations of probable P.? experplexus the mature P₁ elements are convex centrally (near the cusp), wheareas in typical populations the corresponding part of the platform is gently concave.

Autekologia

Występowanie geograficzne

Jabłonna, Ostrówka, Kowala, and Dzikowiec.

Zasięg czasowy

L. styriacus and P. jugosus Zones.  

Materiały muzealne

ZPAL: 554 specimens.

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.