Eumorphoceras bisulcatum (Girty, 1909)
Sugerowana cytacja: Gryz, P. 2023. Eumorphoceras bisulcatum (Girty, 1909) . Ikonoteka (http://ikonoteka.paleo.pan.pl/xwiki/bin/view/Species/Eumorphoceras+bisulcatum+)
 Diagnoza Discoidal shell, becoming increasingly so with advancing age; umbilicus moderately large, proportionately smaller in mature specimens than in young ones; cross section changes in ontogeny, from transverse and elliptical to radially elongate and elliptical at maturity; surface is divided by two revolving sulci into three nearly equal portions; areas nearest the umbilicus are marked by regular, strong, angular, radiating ribs, separated by subangular channels of about the same width; near the revolving sulci the ribs and channels are bent strongly forward, and at the same time they rapidly die out and disappear; ventral area rises rather strongly from the two sulci, by which it is defined. Porównanie Juvenile specimens resemble Gastrioceras richardtfonianum but are thicker, not compressed-discoidal, and marked by transverse costae, coarser and stronger than the lirae of Gastrioceras. Autekologia Występowanie geograficzne USA (Oklahoma, Arkansas, Texas, Nevada, California), Algeria, Germany (Rhenish Slate Mts.), Kazakhstan (South Urals), Ukraine (Lvov-Volhyn Basin), Poland Zasięg czasowy Carboniferous, Serpukhovian-Bashkirian (upper Fayetteville - upper Pitkin). Materiały muzealne Literatura Bojkowski, K. 1979. Gonatyty z karbonu Górnośląskiego i Lubelskiego Zagłębia Węglowego. Biuletyn Instytutu Geologicznego 311: 5-68. 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. Girty, G.H. 1909. The fauna of the Caney Shale of Oklahoma. U.S. Geological Survey Bulletin 377: 1-106. Musiał, Ł. & Tabor, M. 1988. Stratygrafia karbonu na podstawie makrofauny. In Z. Dembowski & J. Porzycki (eds.), Karbon Lubelskiego Zagłębia Węglowego. Prace Instytutu Geologicznego 122: 88-111. Żelichowski, A.M. 1972. Występowanie goniatytów w osadach karbonu na obszarze hrubieszowsko-tomaszowskim (SE Polska). Geological Quarterly 16 (3): 587-596. |
|
