Brachiopods from the Silberberg Formation (Late Eocene to Early Oligocene) of Atzendorf, Central Germany

Abstract

Six brachiopod species, i.e., Discradisca sp., Cryptopora sp., Pliothyrina sp. cf. P. grandis (Blumenbach, 1803), Terebratulina tenuistriata (Leymerie, 1846), Rhynchonellopsis nysti (Bosquet, 1862), and Orthothyris pectinoides (von Koenen, 1894), have been identified in the Late Eocene to Early Oligocene Silberberg Formation of Atzendorf, Central Germany. The species R. nysti and O. pectinoides dominate the studied assemblage. Rhynchonellopsis is here transferred from the family Cancellothyrididae to Chlidonophoridae because it has a loop without united crural processes. Orthothyris pectinoides has a brachial skeleton of chlidonophorid type, but its transverse band is incomplete. In species composition, the assemblage from Atzendorf differs from other Paleogene and Neogene European assemblages by the absence of megathyridids and dominance of chlidonophorids, indicating a relatively deep environment.

Late Eocene (Priabonian) brachiopod fauna from Dnipropetrovsk, eastern Ukraine

“…In shell outline and ornamentation the specimens closely resemble those from other localities (e.g. Bitner 2000;Bitner & Müller 2015 Dall (1920, p. 331).…”

“…However, such preference for the dorsal valve was also recognized in other Cenozoic populations (e.g. Bitner et al 2013a, Bitner & Müller 2015. Additionally, in the ribbed brachiopods, such as M. detruncata and A. lunula, preferential drill hole siting is observed.…”

“…However, in the Cenozoic drilling predation on brachiopods was only occasionally intense (e.g. Baumiller & Bitner 2004;Harper 2005Harper , 2011Baumiller et al 2006;Tuura et al 2008), usually traces of drill holes are infrequent, often in barely 1% of specimens (Taddei Ruggiero & , Bitner et al 2013a, Bitner & Müller 2015, Bitner & Motchurova-Dekova 2016. At Dnipropetrovsk the frequency of drill holes in brachiopods is relatively high; 130 drilled specimens (9.6%) were found among 1356 specimens examined (Fig.…”

“…-Late Eocene (Priabonian) of Dnipropetrovsk, Ukraine. Several species of Discradisca have been recognized in the Paleogene and Neogene of Europe (see Bitner & Cahuzac 2013;Dulai 2013Dulai , 2015Bitner & Müller 2015;Bitner & Motchurova-Dekova 2016).…”

Nuevos datos sobre las faunas marinas del Eoceno medio-superior de Navarra (área surpirenaica occidental). Revisión de los fósiles de la colección Ruiz de Gaona

“…tenuistriata es una especie común en el Eoceno de Europa, incluida la región pirenaica (Bitner, 2000), así como en el sur del Tetis (Bitner & Boukhary, 2012). También se ha reconocido en el Oligoceno inferior de Alemania (Bitner & Müller, 2015). En la CRG, entre los ejemplares de Ilundain los hay de mayor talla que los provenientes de Ardanatz.…”