Hemilistrona margaritata (Schäfer, 1976), a polygnathid with ornate platform, from the L. styriacus Zone at Ostrówka  in the Holy Cross Mountains.

Diagnoza

Porównanie

Longitudinal rows of tubercles on the platform of lanceolate P₁ elements are typical for the species. The morphology of this kind may be a part of population variability of H. homoirregularis. However, there seems to be a change in morphology of longitudinally ornamented P₁ elements of Hemilistrona. In geologically younger samples the tubercles are less prominent and the platform more regularly lanceolate, giving the P₁ elements aspects somewhat similar to Dasbergina kayseri.

Autekologia

Występowanie geograficzne

Ostrówka.

Zasięg czasowy

L. styriacus Zone. 

Materiały muzealne

ZPAL: 14 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.