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Delft, Netherlands

Jagt J.W.M.,Natuurhistorisch Museum Maastricht | Jackson J.,P.O. Box 295 | van der Ham R.W.J.M.,Piet Heinstraat 6
Cretaceous Research | Year: 2014

A new species of saleniid is recorded from the so-called 'Eagle Ford Condensed Zone' with typical elements of the late Turonian Prionocyclus hyatti cephalopod Zone, which rests unconformably on the South Bosque Marl (Collignoniceras woollgari cephalopod Zone) in the Georgetown area, Williamson County (central Texas). It is easily distinguished from both extinct (late Albian-early Paleocene) and extant congeners by a comparatively low test, wide ambulacral zones with large (near-)horizontal pore pairs, a large peristome with conspicuous gill slits and a highly ornamented apical disc with a relatively small suranal plate. The new species constitutes the first record of the genus Bathysalenia from North America. © 2014 Elsevier Ltd. Source


Van Der Ham R.W.J.M.,Piet Heinstraat 6 | Jagt J.W.M.,Natuurhistorisch Museum Maastricht | Janssens H.J.,Rijksweg 97
Geologie en Mijnbouw/Netherlands Journal of Geosciences | Year: 2011

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. Source

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