Otoliths from Upper Oligocene near shore deposits of the Lower Rhine Embayment (Northern Germany) Otolithen aus küstennahen Sedimenten des Ober-Oligozän der Niederrheinischen Bucht (Norddeutschland)

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Abstract:

New otolith finds from locations along the western and southeastern shores of the Late Oligocene sea of the Lower Rhine Embayment are documenting a variety of coastal environments ranging from calm embayment / backreef settings (Ratingen) to high energy shore line (Mettmann) and marine karst infill sediments (Osterholz), a unique environment for fossil otolith research. Environmental indicators are for instance found in the genus with being common in the calm near shore bay of Ratingen, in offshore environments below the active wave base or the lack of species in the very high energy shore environments of Mettmann. Perciformes and Scorpaeniformes are particularly common and rich in species in most near shore environments. Some species of fishes typical for rocky shores are exclusively reported from these environments, such as from the Labridae, Leiognathidae, Opisthognathidae or the cottid genus The elsewhere ubiquitous Gadidae are considerably less common as usual and represented with few species. The Osterholz marine karst infill has yielded fossils from two slightly different Late Oligocene times of which the younger is remarkable for the abundance of otherwise uncommon to rare near shore fishes such as (sympatrically to the common ), and . The nearshore sand facies of Lucherberg at the southeastern rim of the Lower Rhine Embayment has yielded the genus which is the first record of the genus in the Late Oligocene of the North Sea Basin. Bregmacerotids are epipelagic fishes living in schools that follow plankton or occur in estuarin environments. A total of 79 otolith based teleost species and one cephalopod statolith are being recorded from these locations, including 6 new species – n. sp., n. sp., n. sp., n. sp., n. sp., and genus aff. n. sp.

German
Neue Otolithen-Funde von Fundstellen entlang des westlichen und südöstlichen Küstensaumes des Oberoligozäns der Niederrheinischen Bucht repräsentieren unterschiedliche Environments in Ruhigwasser- und Bewegtwasserbereichen bis hin zu küstennahen marinen Karstfüllungen. Milieuabhängig ist zum Beispiel das Auftreten von Archaegadiculus mutabilis im Ruhigwasserbereich geschützter Buchten, wie an der Fundstelle Ratingen, oder das völlige Fehlen der Gattung Archaegadiculus im starken Bewegtwasser-Milieu von Mettmann. Auffallend sind auch die relative Häufigkeit und der Artenreichtum der Perciformes in den küstennahen Environments, während die Gadiden dort seltener und vor allem artenärmer vertreten sind als in den Beckenbereichen. In der Fundstelle Lucherberg am Südost-Rand der Niederrheinischen Bucht wird zum ersten Mal die Gattung Bregmaceros im Oberoligozän des Nordsee-Beckens nachgewiesen. Bemerkenswert ist auch das häufige Auftreten von Trachinus verus, einer bis dato sehr wenig bekannten Art der Gattung Trachinus, im Chatt B der marinen Karstfüllungen von Osterholz, parallel zu der weit verbreiteten und häufigen Art T. biscissus.

In den genannten Fundstellen wurden insgesamt 79 Otolithen-basierte Teleosteer-Arten und eine Art von Cephalopoden-Statolithen nachgewiesen, darunter insgesamt 5 neue Arten, Calamopteryx petermoelleri n. sp., Capros siccus n. sp., Scorpaena quaesita n. sp., Centropomus rullus n. sp. und genus aff. Opistognathus koeneni n. sp.

Keywords: NEW SPECIES; NORTH SEA BASIN; OTOLITHS; PALEOENVIRONMENT; TELEOSTEI; UPPER OLIGOCENE

Language: German

Document Type: Research Article

DOI: http://dx.doi.org/10.1127/0077-7749/2008/0248-0011

Publication date: April 1, 2008

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