Two more Bohemian trilobites from the Ordovician of Portugal and Morocco

Abstract

Two trilobite species so far exclusive from the Dobrotivá Formation of the Prague Basin are reported for the first time outside Bohemia. The first is represented by a single specimen of <i>Dindymene plasi</i> Kielan, 1960 that occurs in Portugal within the Valongo Formation near Beloi, on the western flank of the Valongo Anticline (Central Iberian Zone). The second is <i>Ectillaenus benignensis</i> (Novák, 1918), recorded by eight articulated specimens which come from two different formations of the First Bani Group of the Moroccan eastern Anti-Atlas, located, respectively, in the upper part of the Guezzart Formation and near the top of the Ouine-Inirne Formation, both in the Jbel Bou Issidane section south of Alnif. All these occurrences are of Dobrotivian age (= late Darriwilian in the global timescale) and reinforce the palaeobiogeographical links within the north Gondwana platform. They are of special interest as it adds to a small group of species roughly coeval over a large area, and is of particular relevance for pre-Variscan palaeogeographic reconstructions

New Middle and Late Ordovician cornute stylophorans (Echinodermata) from Morocco and other peri-Gondwanan areas

“…The preservation of particularly delicate structures such as the feeding arms of ophiuroids and the brachioles of most specimens of Ascocystites are also evidence of a rapid burial (Lefebvre et al 2008(Lefebvre et al , 2010aHunter et al 2010;Nardin & Régnault 2015). This interpretation is further supported by the preservation of some ophiuroids 'caught in the act' of feeding on small eocrinoids (Lefebvre et al 2008;Nardin & Régnault 2015;Gutiérrez-Marco et al 2020). Burial was thus probably fast and deep enough to prevent vagile epifaunal invertebrates (e.g.…”

“…The first excavation corresponds to Destombes' locality 1826 (Fig. 17.2;Chauvel 1971Chauvel , 1978Gutiérrez-Marco et al 2003;Destombes 2006b;Rábano et al 2020). It is located on the western flank of Jbel Bou Isidane, about 9 km E of Taichoute.…”

A remarkable illaenid trilobite from the Middle Ordovician of Morocco

“…sp. in the Tachilla Formation and some beds of the First Bani Group (references in Gutié-rrez-Marco et al 2003), the "Bohemian" form Ectillaenus benignensis (Novák, 1918) in the Guezzart and Ouine-Inirne formations (Rábano et al 2010), and the preliminary identification of the "southwestern-European" species Ectillaenus giganteus (Burmeister, 1843) and Panderia beaumonti (Rouault, 1847) from the Tachilla and Guezzart formations by the present authors (unpublished data). The record of C. nicolasi adds a new and important element to the palaeobiogeographical knowledge of Ordovician trilobite assemblages from the peri-Gondwanan African margin, and fits well in the so-called "Calymenacean-Dalmanitacean" cratonic fauna (Cocks & Fortey 1990), represented by particular inshore trilobite biofacies developed in southernmost Gondwanan palaeolatitudes and very rich in endemic forms.…”

“…The most recent report of illaenid trilobites from the Anti-Atlas was by Rábano et al (2010), who documented the first Moroccan record of the Bohemian species Ectillaenus benignensis (Novák, 1918) from two localities of late Darriwilian age in the Guezzart and Ouine-Inirne formations of the First Bani Group, reinforcing the palaeobiogeographical relationships between Bohemia and Morocco across the peri-Gondwanan platform.…”

Middle Ordovician trilobites from the Castillejo Formation, Eastern Iberian Range (NE Spain): taxonomic reappraisal, biostratigraphy, and correlation

“…The trilobites identified in this work belong to various genera and species with a wide distribution in the Ordovician of southwestern Europe (France, Spain, Portugal). They were taxonomically described in numerous modern studies carried out in the Iberian and Armorican massifs, mainly published by Henry (1965aHenry ( , 1965bHenry ( , 1966Henry ( , 1968aHenry ( , 1968bHenry ( , 1970Henry ( , 1980aHenry ( , 1980bHenry ( , 1981, Nion and Henry (1967), Henry and Nion (1970), Clarkson and Henry (1970), Hammann (1971Hammann ( , 1974Hammann ( , 1983, Henry and Clarkson (1975), Romano (1976Romano ( , 1980Romano ( , 1982Romano ( , 1990aRomano ( , 1990bRomano ( , 1991, Bruton and Henry (1978), Hammann and Henry (1978), Henry and Romano (1978), Romano and Henry (1982), Hammann and Rábano (1987), Rábano (1981Rábano ( , 1989aRábano ( , 1989bRábano ( , 1989cRábano ( , 1989d, Rábano and Gutiérrez-Marco (1983), Henry et al (1993), Tauber and Reis (1994), Tauber et al (1997), Sá et al (2006), Rábano et al (2010…”