In the Netherlands, Late Palaeozoic pelmatozoans – that is, stalked echinoderms – are known from building stones and cobbles in rivers, but there are no in-situ carbonate rocks from which they might be collected. Unsurprisingly, most recognisable specimens are columnals and pluricolumnals. Two small thecae, collected in the mid-1970s from silexite cobbles in the bedload of the River Maas in the Venlo-Tegelen area (province of Limburg, south-east Netherlands) are exceptional finds. One specimen, the diplobathrid camerate crinoid Rhodocrinites sp., has an unsculptured theca and some minor differences of form, yet otherwise satisfies the diagnosis of this genus. The other, the pentremitid blastoid Doryblastus? sp. is rather poorly preserved, yet is the first blastoid to be recorded from the Netherlands. Either or both of these specimens may be juveniles, particularly the blastoid. They are unlikely to be coeval, coming from separate cobbles and being of slightly different preservation. Their provenance from silexite cobbles suggest they originated from Lower Carboniferous (Tournaisian-Visean = Mississippian) carbonates in the southern Ardennes (south-central Belgium).

在荷兰，从河流中的建筑石块和鹅卵石中可以了解到晚古生代的兽足类动物（即棘生的棘皮动物），但没有可从中收集的原位碳酸盐岩石。毫不奇怪，大多数可识别的标本都是圆柱状和多柱状的。1970年代中期，从芬洛-特格伦地区（荷兰东南部林堡省）马斯河河床的硅石卵石中收集到的两个小卵泡是非凡的发现。一个标本，双叶型相机摄下的类红藻Rhodocrinites sp。，具有未雕刻的鞘膜和一些细微的形式差异，但在其他方面满足了该属的诊断。另一种是半球形胚样Doryblastus？sp。胚泡保存得很差，但却是荷兰记录的第一个胚泡。这些标本中的一个或两个都可能是少年，尤其是胚泡。它们不太可能是同一时代的，它们来自不同的鹅卵石，并且保存程度略有不同。它们来自硅镁土的产地表明它们起源于阿登南部（比利时中南部）的下石炭系（Tournaisian-Visean =密西西比）碳酸盐。