van der Ham, R. W. J. M., Jagt, J. W. M. & Janssens, H. J. 2011. Leymeriaster campestris, a new early Campanian hemiasterid echinoid from southern Limburg, the Netherlands. Netherlands Journal of Geosciences — Geologie en Mijnbouw 90, 179-185.
154073
Publication
In the type area of the Maastrichtian Stage (northeast Belgium, southeast Netherlands), two species of the rare hemiasterid echinoid genus
Leymeriaster were known to date. Here we describe a third, L. campestris sp. 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. maestrichtensis and L. 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 from L. maestrichtensis by the lack of a clear notch in
the ambitus in ambulacrum III, and from L. eluvialis in the presence of a distinctly longer groove in ambulacrum III. Leymeriaster campestris sp.
nov. is the first undoubted species of Campanian Leymeriaster known from northwest Europe.
Keywords: Echinoidea, Hemiasteridae, Late Cretaceous, the Netherlands, new species