Polygnathus pennatulus Ulrich & Bassler, 1926
Sugerowana cytacja: Dzik 2015. Polygnathus pennatulus Ulrich & Bassler 1926. Ikonoteka (http://ikonoteka.paleo.pan.pl/xwiki/bin/view/Species/Polygnathus+pennatulus+)
 Diagnoza Deeply concave platform occlusal surface with strong transverse ribs, outline of the platform triangular in juvenile specimens but its sides become parallel at later stages in the ventral half. Porównanie A few specimens of this species occuring without other platform-bearing polygnathids from the Sheffield-Maple Mill Formation of Nebraska, support its separate status. Although the P1 elements are closely similar to those of Immognathus rhabdotus in the oral view, their bases are typical for Polygnathus. This makes relationship to the Immognathus lineage less likely than to P. kadzielniae, although aspects of the basal cavity are variable in these conodonts. The available material is too small to enable apparatus reconstruction, so I preserve the traditional location of the species provisionally. Autekologia Występowanie geograficzne Ostrówka, Kowala, Miedzianka, and Dzikowiec. Zasięg czasowy L. styriacus and P. jugosus Zones. Materiały muzealne ZPAL: 77 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. |
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