NDLI: Tryplasma (Anthozoa, Rugosa) in the Middle Devonian of the Eifel area (Rheinisches Schiefergebirge, Germany)

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Tryplasma (Anthozoa, Rugosa) in the Middle Devonian of the Eifel area (Rheinisches Schiefergebirge, Germany)

Content Provider	Springer Nature Link
Author	Glinski, Alfons
Copyright Year	2001
Abstract	Aus der Eifel wird ein Vorkommen der GattungTryplasma Lonsdale 1845 (Familie TryplasmatidaeEtheridge 1907) mit der SpeziesTr. rohrensis n. sp. beschrieben. Die neue Art tritt relativ häufig in der Ahrdorf-Formation des unteren Mittel-Devons auf und ist in ihrer regionalen Verbreitung an die korallenreiche Fazies der basalen Niederehe-Subformation gebunden. Es handelt sich um den ersten Nachweis im mittel- und westeuropäischen Mittel-Devon.Die Trabekel-Struktur vonTryplasma rohrensis n. sp. wird vergleichend auf ihren taxonomischen Wert untersucht und die damit verknüpfte Terminologie diskutiert. Der Konzeption des „Rhabdacanths“ sensuHill (1936) wird die Auffassung von einem stofflich differenzierten Trabekel-Kern („Primärseptum“ auct.) gegenübergestellt. Im Nebenaspekt der mikroskopischen Analyse werden identische Trabekelstrukturen bei einer Spezies der tabulaten GattungSyringocystis Deng 1966 erkannt, welche sich damit für eine grundlegende Revision und Neudeutung ihrer systematischen Position anbietet. Ein Vergleich mitTryplasma liegt nahe, somit ist eine Klassifizierung als „Rugosa“ möglich.DerTryplasma-Horizont bildet einen prägnanten stratigraphischen „Marker“, der die isochrone Korrelation der Riff-Fazies der Niederehe-Subformation in den einzelnen Eifel-Mulden untermauert und damit auch die herkömmliche stratigraphische Datierung der Schichten im Grenzbereich Ahrdorf-/Junkerberg-Formation bestätigt. Altersbeziehungen zwischen dem Korallenriff am Antoniusbusch bei Rohr und dem Bouderath-Riff der östlichen Blankenheimer Mulde bestehen nicht. Das als „Koellium“ angesprochene Vorkommen am Hollerberg wird in die Untere Nohn-Formation zurück gestuft.Bei der großregionalen Analyse derTryplasma-Verbreitung ergeben sich zahlreiche biostratigraphische Parallelen zwischen Eifel und russischen Devon-Provinzen Europas und Asiens sowie mitteldevonischen Arealen Chinas und Australiens, die auf enge paläogeographische Zusammenhänge hindeuten.The genusTryplasma Lonsdale 1845 with the speciesTryplasma rohrensis n. sp. (family TryplasmatidaeEtheridge 1907) has been recorded from the middle and western European Middle Devonian for the first time.Tryplasma is widely distributed in the lowermost part of the coralrich Niederehe Subformation (Eifelian, Ahrdorf Formation) of the Eifel Mountains. From investigation of the trabecular microstructure of the new speciesTryplasma rohrensis in view of its taxonomic value and related terminology, the hitherto preferred idea of „rhabdacanths“ sensuHill (1936) cannot be fully accepted and is instead contrasted with the concept of „Primärseptum“ of some earlier authors. Microscopic analysis revealed identical acanthine characteristics in a species of the tabulate genusSyringocystis Deng 1966, thus suggesting a basic revision and reinterpretation of its systematic position.Syringocystis can clearly be compared withTryplasma and so possibly classified as a rugose coral.The horizon withTryplasma constitutes a sharp stratigraphical marker. Its horizontal distribution supports the isochronic correlation of the Niederehe reefal facies in the individual Eifel Synclines and, in addition, confirms the traditional dating of the stratigraphic boundary layers of the Ahrdorf and Junkerberg formations. There is no age relationship between the Antoniusbusch Reef near Rohr and the Bouderath Reef (Hollerberg) in the eastern Blankenheim Syncline, which belongs to the Nohn Formation.Regional analysis ofTryplasma occurrences indicates many biostratigraphical parallels between the Eifel region and the Russian Devonian provinces in Europe and Asia as well as Middle Devonian areas in China and Australia and points to certain palaeogeographic connections.
Starting Page	71
Ending Page	89
Page Count	19
File Format	PDF
ISSN	00372110
Journal	Palaeobiodiversity and Palaeoenvironments
Volume Number	81
Issue Number	1
Language	English
Publisher	Springer-Verlag
Publisher Date	2001-01-01
Publisher Place	Berlin, Heidelberg
Access Restriction	Subscribed
Subject Keyword	Corals Tryplasma Syringocystis skeletal structure stratigraphy Middle Devonian Eifel Germany Paleontology Biodiversity Animal Systematics/Taxonomy/Biogeography Plant Systematics/Taxonomy/Biogeography Freshwater & Marine Ecology
Content Type	Text
Resource Type	Article
Subject	Paleontology

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