Protognathodus kockeli (Bischoff, 1957) from the terminal Famennian at Dzikowiec - P₁ elements.

Protognathodus kockeli  - P₁ element.

Protognathodus kockeli (Bischoff, 1957) from the Tournaisian Wapnica beds of Dzikowiec, Sudetes.

Apparatus composition of Protognathodus kockeli

Diagnoza

Mature P₁ elements with thickened basal cone covered with irregularly distributed tubercles; they may be missing in juveniles.

Porównanie

The apparatus is of a rather generalised polygnathid morphology. Only the relatively loosely distributed denticles and elongated processes of the P₂ element may allow its discrimination from similar apparatuses. The S elements of Protognathodus kockeli resemble those of the earliest member of Gnathodus, G. punctatus (Cooper, 1939) in that it does not show the strong external curvature of the ventral proces, which is the characteristic feature for all the other idiognathodontids. G. delicatus Branson & Mehl, 1938, which in North America occurs in the upper portion of the range of Siphonodella, being thus coeval with latest Protognathodus populations in Europe, differs from P. kockeli in a more asymmetric distribution of tubercles on the conical part (cup) of the P₁ elements.

Autekologia

Występowanie geograficzne

Kowala (samples Ko-51 and Ko-24), Holy Cross Mountains and and Dzikowiec (Dz-75, Sudetes, Poland).http://ikonoteka.paleo.pan.pl/xwiki/bin/download/Species/Protognathodus+kockeli+/Protognathoduskockei.jpg

Zasięg czasowy

Terminal Famennian. 

Materiały muzealne

ZPAL: 42 specimens. 

Literatura

Dzik, J. 1997. Emergence and succession of Carboniferous conodont and ammonoid communities in the Polish part of the Variscan sea. Acta Palaeontologica Polonica 42, 57-170.

Dzik, J. 2006. The Famennian "Golden Age" of conodonts and ammonoids in the Polish part of the Variscan sea. Palaeontologia Polonica 63, 1-359.