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Journal of Paleontology

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NEW AND REVISED OCCURRENCES OF ORDOVICIAN CRINOIDS FROM SOUTHWESTERN EUROPE

¹ Department of Geological Sciences, 155 South Oval Mall, The Ohio State University, Columbus 43210-1397, <ausich.1{at}osu.edu>,
² Departamento de Geologia, Universidade de Trás-os-Montes e Alto Douro, 5001-911 Vila Real, Portugal, <asa{at}utad.pt>,
³ Instituto de Geología Económica (CSIC-UCM), Facultad de Ciencias Geológicas, 28040 Madrid, Spain, <jcgrapto{at}geo.ucm.es>

A comprehensive treatment of Ordovician crinoids from southwestern Europe is presented, including taxa based on articulated crowns and stems. This summary incorporates new material, new localities, and a revision of some southwestern Europe occurrences. The first record of an Ordovician crinoid from Portugal, Delgadocrinus oportovinum n. gen. and sp., is reported, and this is the oldest known crinoid from the Iberian Peninsula (Arenigian/Oretanian boundary, early Darriwilian). Geographic and temporal ranges of several crinoids are revised from peri-Gondwanan areas in southwestern Europe and northern Africa or modified with new Iberian material. The Spanish range of Heviacrinus melendezi Gil Cid et al., 1996 is extended down into the lower upper Oretanian, and Merocrinus millanae Ausich et al., 2002 is restricted to the upper lower Dobrotivian. The stratigraphic position of Ortsaecrinus cocae Gil Cid et al., 1999b is restricted to the early middle Berounian, and the range of Visocrinus castelli Ausich et al., 2002 is restricted to the late middle Berounian (see Fig. 2). New topotype material of Morenacrinus silvani Ausich et al., 2002 is reported that furthers understanding of the occurrence this taxon, which was previously only positively known from the holotype.

View larger version (26K): [in this window] [in a new window]    FIGURE 2—Revised chronostratigraphic distribution of Ordovician crinoids in southwestern Europe and northwestern Africa, with references to the Global Ordovician series, the Avalonian series of the British regional scale, and the stages of the North Gondwanan regional scheme