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Emmen, Netherlands

Rhebergen F.,Slenerbrink 178
Scripta Geologica | Year: 2011

The type and only specimen of Fibrocoelia tubantiensis Van Kempen, that was housed in the palaeontological collection of the Geological Institute of the University of Amsterdam, has been reposited in the Netherlands Centre for Biodiversity - Naturalis, Leiden, the Netherlands. Syltrochos pyramidoidalis Von Hacht, placed in an uncertain order and family by Finks & Rigby, is revised on the basis of new material. This has revealed that the skeleton is composed of spheroclones, so that the species has to be assigned to the Astylospongiidae von Zittel. The species name Carpospongia langei Von Hacht is invalid, being a junior synonym of Carpospongia pogrebowi Asatkin.

Rhebergen F.,Slenerbrink 178
Scripta Geologica | Year: 2014

The new anthaspidellid taxon Brevaspidella dispersa is erected for specimens recovered from the Late Ordovician sponge assemblages of the island of Gotland, Sweden and the Dutch-German border region. In the latter area, they are collected from Early Pleistocene fluvial deposits of the Baltic River System, whereas those from Gotland are part of Late Pleistocene glacial or fluvio-glacial deposits. The provenance of both assemblages is uncertain, but they probably originated from an Ordovician basin in the northern Baltic Sea or the Bothnian Gulf, west of Finland. As yet, Brevaspidella dispersa gen. et sp. nov. is restricted to the Gotland-German-Dutch sponge association and has not been found in the assemblage of nearly-coeval 'lavender-blue cherts' and 'blue sponges'. The new taxon is closely related to the genus Anthaspidella, but differs in the aquiferous system and in having a well developed concentrically wrinkled dermal layer.

Baars C.,National Museum Wales | Popov L.,National Museum Wales | Rhebergen F.,Slenerbrink 178 | Klishevich I.A.,Saint Petersburg State University
Palaontologische Zeitschrift | Year: 2014

An assemblage of earliest Silurian (Llandovery, Rhuddanian) fossils from South Kazakhstan (Ak-Kerme Peninsula, Lake Balkhash) contains solitary rugose corals (Calostylis denticulata, Streptelasma? sp., and Cystipaliphyllum sp.) and the demosponge Calycocoelia typicalis, which are described here. This assemblage occurs with previously described brachiopods and constitutes a post extinction survival fauna; such faunas are poorly known and this study fills a gap in our knowledge. All three genera of Rugosa were transitional across the Ordovician–Silurian boundary and are also reported from other parts of Kazakhstan, Uzbekistan, and Tajikistan during the Llandovery. Streptelasma had already been present in Kazakhstan during the Ordovician, while during the Rhuddanian Calostylis immigrated from Baltica or China, and Cystipaliphyllum from the Australian part of Gondwana. Demosponges are rare during the Llandovery but probably had a cosmopolitan distribution. Calycocoelia typicalis marks the first Rhuddanian record of lithistid demosponges, and the first record of Silurian demosponges from Kazakhstan. © 2013, Springer-Verlag Berlin Heidelberg.

Botting J.P.,CAS Nanjing Institute of Geology and Palaeontology | Rhebergen F.,Slenerbrink 178
Scripta Geologica | Year: 2011

A new species of complex hexactinellid sponge, Haljalaspongia inaudita, is described from fluvially transported blocks found in northwestern Germany, near the Dutch border, but which probably originated from the eastern Baltic region. The heavily folded wall is composed of multiple spicule layers, including dermal and gastral layers of acanthohexactines, and a central layer of sub-parallel monaxons. The monaxial layer is lined on one side by a reticulate array of smooth monaxons. The sponge is difficult to assign to any known fossil or recent group, but shares some features with the dictyospongioid family Docodermatidae.

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