Abstract
AbstractIn the type area of the Maastrichtian Stage (northeast Belgium, southeast Netherlands), two species of the rare hemiasterid echinoid genusLeymeriasterwere known to date. Here we describe a third,L. campestrissp. nov., from the so-called ‘Laagje van Müller’ (Gemmenich Member, Vaals Formation) at Vaals-Eschberg, southern Limburg (the Netherlands), which is of early Campanian age. It differs from its late Maastrichtian congeners in the area,L. maestrichtensisandL. eluvialis, in that the pore pairs in the frontal groove of ambulacrum III are not in small depressions and the adjacent interambulacral margins are not thickened, raised and/or overhanging. It differs fromL. maestrichtensisby the lack of a clear notch in the ambitus in ambulacrum III, and fromL. eluvialisin the presence of a distinctly longer groove in ambulacrum III.Leymeriaster campestrissp. nov. is the first undoubted species of CampanianLeymeriasterknown from northwest Europe.
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