Polynodosus triphyllatus (Ziegler, 1960) from the C. quadrantinodosa Zone at Łagów in the Holy Cross Mountains.

Diagnoza

Platform of P₁ element strongly constricted in the midlength.

Porównanie

According to Helms (1961) and Vorontzova (1993) a few chronospecies of polygnathids with ornate platform preceded this species in its lineage. In my material there seems to be a continuity between P. confluens and P. triphyllatus and gradual increase in depth of platform constriction, the character highly variable within each sample.

Juvenile elements described as Polygnathus cf. P. diversus by Metzger (1994), who identified P₂ elements and illustrated their ontogeny, probably belong to a population transitional between P. confluens and P. triphyllatus, as suggested by co-occurrence with mature P₁ elements.

Nomenclatorial problems connected with this species have been discussed by Glenister and Klapper (1966, p. 834).

Autekologia

Występowanie geograficzne

Kowala, Łagów and Miedzianka.

Zasięg czasowy

C. quadrantinodosa to C. marginifera Zones. 

Materiały muzealne

ZPAL: 1,106 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.