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References: W. Erich Schmidt (1934) Die Crinoideen des Rheinischen Devons. Abhandlungen der Preußischen Geologischen Landesanstalt. Neue FolgeHeft 163, pp.1-148. C. Bartels, M. Poschmann, T. Schindler & M. Wuttke (2002) Palaeontology and palaeoecology of the Kaub Formation (Lower Emsian, Lower Devonian) at Bundenbach (Hunsrück, SW Germany) Metalla (Bochum) 9.2, 2002, 105-122. G. D. WEBSTER & C. G. MAPLES (2006) CLADID CRINOID (ECHINODERMATA) ANAL CONDITIONS: A TERMINOLOGY PROBLEM AND PROPOSED SOLUTION. Palaeontology, Vol. 49, Part 1, 2006, pp. 187–212.

Taxonomy from Fossilworks.org. Description (Südkamp 2017, p. 100): "The flattened theca is angular and trapezoidal in outline. The large angular anal field is positioned in the centre of one side of the theca (the anal), allowing it to be distinguished from the other (the abanal). The delicate plates are organized in large arcs across the abanal side. The peripheral rim is flat. The stem is very long. The body-oriented part consists of alternating simple and large collar ring-like elements. The more elongate distal elements are barrel-shaped. The long and slender uniserial brachiales are in the exothecal projections for food-gathering. Name meaning: Regula = Leiste, pleuro = to the side, lateral. Identified by oilshale. References: Dehm, R. (1934) Untersuchungen an Cystoideen des rheinischen Unterdevons. Sitzungsberichte der mathematisch-naturwissenschaftlichen Abteilung der Bayerischen Akademie der Wissenschaften zu München. 1934 Heft 1, p 19-43, 2 Tab. Nardin, E. and Bohatý, J. (2013) A new pleurocystitid blastozoan from the Middle Devonian of the Eifel (Germany) and its phylogenetic importance. Acta Palaeontologica Polonica 58 (3): 533–544. Südkamp, W. (2017) Life in the Devonian. Identification book Hunsrück Slate fossils. Verlag Dr. Friedrich Pfeil. München 2017. ISBN978-3-89937-221-2.