The earliest ostracods from the Ordovician of the Prague Basin, Czech Republic

Abstract

ABSTRACT:Lajblová, K. and Kraft, P. 2014. The earliest ostracods from the Ordovician of the Prague Basin, Czech Republic. Acta Geologica Polonica, 64 (4), 367-392. Warszawa.The earliest ostracods from the Bohemian Massif (Central European Variscides) have been recorded from the Middle Ordovician of the Prague Basin (Barrandian area), in the upper Klabava Formation, and became an abundant component of fossil assemblages in the overlying Šárka Formation. Both early ostracod associations consist of eight species in total, representing mainly eridostracans, palaeocopids, and binodicopids. The revision, description, or redescription of all species and their distribution in the basin is provided. Their diversification patterns and palaeogeographical relationships to ostracod assemblages from other regions are discussed.

A revision of the Ordovician cephalopod Bactrites sandbergeri Barrande: Systematic position and palaeobiogeography of Bactroceras

“…Precise stratigraphic position is mostly not possible to determine as most of the specimens come from old collections of siliceous nodules weathered out of the shale outcrops. Faunal associations and previous biostratigraphic investigations at individual localities with Bactroceras sandbergeri mostly imply the Corymbograptus retroflexus Biozone, or alternatively, the Didymograptus clavulus Biozone (see Lajblová and Kraft, 2014; Table 2). …”

Putative Ordovician green alga Krejciella reinterpreted as enteropneust hemichordate tube (Czech Republic)

“…Type specimens of Krejciella. Original specimens described by Obrhel (1968) were collected by an amateur collector F. Putzker in loose siliceous nodules; such loose siliceous nodules containing Middle Ordovician fossils are widely distributed in the Prague Basin and are known at numerous outcrops of Šárka and Dobrotivá formations (see Lajblová and Kraft, 2014). Type specimens of Obrhel (1968) are comparatively small fragments of three-dimensionally preserved tubeshaped fossils.…”

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“…1) are a classical source of diverse and wellpreserved skeletal fauna (e.g., HAVLÍČEK & VANĚK, 1966), including abundant trilobites (BUDIL et al, 2007). A rich association of disarticulated and ar ticulated trilobites, agnostids, echinoderms, brachiopods, hyo liths, organicwalled microfossils, and graptolites associated with remains of phyllocarid crustaceans, bivalves, cephalopods, ostra cods, and trace fossils have been thoroughly examined from these two formations for nearly two hundred years (CHLUPÁČ, 1970;KRAFT, 1972;BUDIL et al, 2007;MANDA, 2008;POLECHOVÁ, 2013;LAJBLOVÁ & KRAFT, 2014;AUBRECHTOVÁ & TUREK, 2018;KRAFT et al, 2020). Since the 19 th century studi es, several tens of thousands articulated trilobite exoskeletons have been collected at several tens of outcrops of Middle Ordovician rocks (e.g., MAREK, 1961;BUDIL et al, 2007;MERGL et al, 2008).…”