Elements of Ligonodina albidens Dzik, 2006 (the correct contents of Fig. 17 in Dzik 2006, in which erroneously pictures from Fig. 18 were inserted)

Apparatus composition of Ligonodina albidens Dzik, 2006. 

Diagnoza

Short triangular ventral process of M element, denticles of external processes of the symmetry transition elements few in number.

Porównanie

The wide cusp of M elements indicates relationship of the species to the Ligonodina main lineage but remaining elements of the apparatus are highly derived morphologically. This species is rather easily recognizable owing to sparsely distributed prominent denticles of adult elements and short external processes of S elements, only single denticles representing them in the S₀ element. In this respect and general appearance of non-M elements, the species resembles the geologically younger Lagovidina obliqua but relationship between these species remains unclear and may be a result of homeomorphy. The species occurs both in the deeper-water area of Jabłonna and shallower environment of Wietrznia located above the Frasnian mudmound.

Autekologia

Występowanie geograficzne

Jabłonna, Wietrznia, Kadzielnia, and Miedzianka.

Zasięg czasowy

The late K. triangularis and K. crepida Zones

Materiały muzealne

ZPAL: 417 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.