Nodosoclymenia distincta Czarnocki, 1989
Sugerowana cytacja: Dzik, J. 2015. Nodosoclymenia distincta Czarnocki 1989. Ikonoteka (http://ikonoteka.paleo.pan.pl/xwiki/bin/view/Species/Nodosoclymenia+distincta+)
 Nodosoclymenia distincta (Czarnocki, 1989) from the P. trachytera (or early L. styriacus) Zone at Ostrówka in the Holy Cross Mountains. Diagnoza Porównanie The material assembled by Czarnocki and split into several species of his genus Nodosoclymenia comes from a single bed (except for N. variabilis from a layer probably immediately above). It is interpreted here as representing a single very variable species. The conch surface ranges from virtually smooth to bearing irregularly distributed and variably expressed lateral ribs. In some specimens the ribs terminate ventrally in prominent tubercles, in others flanks are almost smooth but ventrolateral tubercles of almost spinose appearance emerge. Although the variability is remarkable, it only slightly exceeds that presented by Korn for a population of Platyclymenia annulata (Münster, 1832) taken from a single bed at Kattensiepen. Almost smooth specimen were probably arbitrarily separated by him in P. subnautilina (Sandberger, 1855) to keep variability in reasonable limits. Stenoclymenia elliptica Czarnocki, 1989 is based on a single specimen from grey crinoidal limestone of unknown stratigraphic provenace but not different from the Nodosoclymenia bed. It shows low massive ribs on the external whorl and fits in the population variablity of N. distincta. Juvenile specimen of Nodosoclymenia has been identified by Korn who also pointed out synonymy of ’s N. lupata Czarnocki, 1989 and M. distincta Czarnocki, 1989. Autekologia Występowanie geograficzne Ostrówka. Zasięg czasowy Probably early L. styriacus Zone. Materiały muzealne 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. |
|
