Polygnathus praecursor
Sugerowana cytacja: Dzik 2015. Polygnathus praecursor Matyja 1993. Ikonoteka (http://ikonoteka.paleo.pan.pl/xwiki/bin/viewrev/Species/Polygnathus+praecursor+)
Diagnoza Strong asymmetry in pairs of P1 elements, mature elements with carina distinct to its tip. Porównanie The apparatus of an earliest Famennian population of the species from the Montagne Noire was restored under the name Polygnathus brevilaminus. The type population of the latter species is different from P. praecursor in showing a more irregular development of the platform in P1 elements and more robust appearance of the whole apparatus, and was classified in Ctenopolygnathus. The earliest Famennian population of true Polygnathus from the Holy Cross Mountains was identified as belonging to the Polygnathus semicostatus lineage. At that time only juvenile platform specimens were known. More numerous material from that locality and other sites in the Holy Cross Mountains shows a significant difference between the earliest and mid Famennian members of the lineage and their classification in separate species is here supported. The species seems to be a continuation of the Frasnian P. webbi lineage and discrimination of their boundaries with morphology alone may not be possible. Autekologia Występowanie geograficzne Płucki, Kowala, Jabłonna, and Kadzielnia. Zasięg czasowy From the beginning of Famennian to the early K. crepida Zone. Materiały muzealne ZPAL: 5,369 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. |
|