Francodina franconica (Sannemann, 1955) from the K. crepida Zone at Jabłonna in the Holy Cross Mountains.

Apparatus composition of Francodina franconica

Diagnoza

M element with equal length of high-arched processes, external process of S elements strongly recurved.

Porównanie

Apatognathus inversus, Ligonodina franconica, Roundya franca, Tripodellus flexuosus and  Roundya prava and Tripodellus tenuis all were based on elements of the species, which are very characteristic and easy to identify even in association with other francodinids and prioniodinids. Elements of the P series are similar to each other in profile view but differ in curvature: P₁ elements are twisted whereas P₂ are laterally bent. S₁ element mimics elements of the palmatolepidid Tripodellus. The species co-occurs sympatrically for most of its range with F. santacrucensis, which is apparently more primitive and closer morphologically to the common ancestor. A possibly relic population transitional between them occurs at Jabłonna  and may represent another species of the genus.

Autekologia

Występowanie geograficzne

Wietrznia; Jabłonna, Wietrznia and Kadzielnia.
 

Zasięg czasowy

Possibly the latest K. triangularis Zone; K. crepida Zone. 

Materiały muzealne

ZPAL: 1,593 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.