Early Cretaceous ribbed aptychi - a proposal for a new systematic classification

0345974 - ÚGN 2011 RIV CZ eng J - Journal Article
Měchová, L. - Vašíček, Zdeněk - Houša, Václav
Early Cretaceous ribbed aptychi - a proposal for a new systematic classification.
Bulletin of Geosciences. Roč. 85, č. 2 (2010), s. 219-274. ISSN 1214-1119. E-ISSN 1802-8225
Institutional research plan: CEZ:AV0Z30860518; CEZ:AV0Z30130516
Keywords : Late Jurassic * J/K boundary * Early Cretaceous * aptychi
Subject RIV: DB - Geology ; Mineralogy
Impact factor: 1.202, year: 2010
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The older system for classification of ribbed calcareous Early Cretaceous aptychi consisted of two genera: Punctaptychus and Lamellaptychus. Later, I. Turculet divided Lamellaptychus into several subgenera. Within the framework of both the genera, species and subspecies were distinguished, which resulted in binominal and trinominal nomenclature. With regard to the richness of newly described species and subspecies in recent years, is not possible to continue using the original system. It is the basic ribbing that plays the decisive role in the generic and subgeneric classification of ribbed aptychi. In the case of subspecies systematics, all details on the valve surface are used with the exception of the sigmoidal bend (fractocostatus) and radial lines (radiatus). The ribbed aptychi are newly divided into the following families: Punctaptychidae fam. nov. and Lamellaptychidae fam. nov.
Permanent Link: http://hdl.handle.net/11104/0187125