Pyrgotrochus macrocephalus (Quenstedt, 1858)
Sugerowana cytacja: Gryz, P. 2020. Pyrgotrochus macrocephalus (Quenstedt, 1858) . Ikonoteka (http://ikonoteka.paleo.pan.pl/xwiki/bin/view/Species/Pyrgotrochus+macrocephalus)
Diagnoza The shell is very broadly conical with a low spire. The coils are slightly concave. Axial ribs or reinforced growth lines are visible only on the early coils. There is a continuous transition from slender, highly conical specimens with concave flanks to very wide, low forms. Porównanie Similar individual variability is present in Pyrgotrochus elongatus (Sowerby, 1818) (Fischer & Weber, 1997). Autekologia Występowanie geograficzne France, southern Germany and Poland to the Eastern European area. Zasięg czasowy Mid Jurassic (Bajocian, Bathonian, Callovian) Materiały muzealne Specimens from Germany, France, Russia and Poland (1 specimen from Balin -NHMW 1867/0008/0023). Literatura Fischer, J.-C. & Weber, Ch. 1997. Révision critique de la paléontologie Française d’Alcide d’Orbigny. Vol. II: Gastropodes jurassiques. 300 pp. Masson, Paris. Gründel, J. 2012. Neubearbeitung der von Laube 1867 beschriebenen Gastropoden fauna aus dem mittleren Jura von Balin/Polen. Annalen des Naturhistorischen Museums in Wien. Serie A, 114, 193–288. Laube, G. C. 1867. Die Gastropoden des braunen Jura von Balin. Denkschriften der kaiserlichen Akademie der Wissenschaften, 28, 1–28. D’Orbigny, A. 1850. Prodrome de Paléontologie stratigraphique universelle des animaux mollusques et rayonnes. Vol. I, 394 pp. Masson, Paris. Quenstedt, F.A. 1858. Der Jura : Mit 3 Uebersichtstafeln, 42 Holzschnitten und einem Atlas von 100 Tab. 842 pp. Laupp, Tübingen. |
|