Tripodellus variabilis (Sannemann, 1955) from the K. crepida Zone at Jabłonna.

Apparatus composition of Tripodellus variabilis.

Diagnoza

Angularly bent P₂ element, elongated platform in P₁ element with short, rounded posterior lobe, elongate external process of M element.

Porównanie

It is convenient to separate the early part of the Tripodellus lineage into at least three chronospecies (T. clarki, T. variabilis, and T. minutus). T. variabilis has been chosen as the name for the first species of the lineage, but there is hardly any evidence that the material of Sannemenn (1955a) truly represents this species as long as advanced K. termini and K. crepida co-occur in the same bed. The P₂ elements of the palmatolepidids are highly variable and at this stage of the evolution they are hardly of much diagnostic value.

P. variabilis is a senior synonym of Palmatolepis minuta wolskae of Szulczewski (1971), on the evidence of material from a bed at Kadzielnia with early P. termini.

Autekologia

Występowanie geograficzne

Jabłonna, Kadzielnia, Wietrznia, Kowala, and Miedzianka. 

Zasięg czasowy

Late K. triangularis and K. crepida Zones. 

Materiały muzealne

ZPAL: 22,931 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.