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Paläontologische Zeitschrift

, Volume 79, Issue 4, pp 493–505 | Cite as

Beyrichosteus radiatus n. g., n. sp., ein brachythoraker Arthrodire mit vollständig verknöchertem Endokranium aus dem höheren Mittel-Devon (Givetium) der Eifel

  • Markus Otto
Article

Kurzfassung

Es wird erstmals ein vollständig perichondral verknöchertes Endokranium eines generalisierten Vertreters der Eubrachythoraci,Beyrichosteus radiatus n. g., n. sp., beschrieben. Das Exemplar zeigt im Gegensatz zu den spezialisierten Wildungener GattungenTapinosteus undPholidosteus, die wiederholt als Modell für die Endokranien coccosteomorpher Arthrodiren angesehen wurden, einen typischen platybasischen Schädel mit weit auseinander liegenden Nasenkapseln, wie er von den unter-devonischen Dolichothoraci her bekannt ist. Andere Merkmale der Augenhöhle und der Nasenkapsel sind dagegen in der von anderen Eubrachythoraci bekannten Weise ausgebildet, und unterscheiden sich von den Dolichothoraci und primitiven Brachythoraci. Für eine phylogenetische Wertung der Merkmale sind gegenwärtig noch zu wenige Beispiele von in ausreichendem Umfang erhaltenen Endokranien anderer brachythoraker Arthrodiren bekannt. Die anBeyrichosteus gemachten Beobachtungen stellen aber die bisherige Zuordnung der Pholidosteidae zu den Coccosteomorphi in Frage.

Schlüsselwörter

Pisces Placodermi Anatomie Endoskelett Devon Eifel 

Beyrichosteus radiatus n. g., n. sp., a brachythoracid arthrodire with completely ossified endocranium from the Middle Devonian (Givetian) of the Eifel hüls

Abstract

A completely perichondrally ossified endocranium of a generalized reprsentative of the Eubrachythoraci,Beyrichosteus radiatus n. g., n. sp., is described. The specimen shows a typical platybasie skull with widely separated nasal capsules like that of the mainly Early Devonian Dolichothoraci. This is contrary to the spezialized generaTapinosteus andPholidosteus from Wildungen, being previously often regarded as model for the endocranium of coccosteomorph arthrodires. However, characters of the orbit and the nasal capsule are more similar to other Eubrachythoraci than to those of Dolichothoraci and primitive Brachythoraci. Until now, there are not enough other examples of sufficiently preserved endocrania of brachythoracid arthrodires known for a phylogenetic analysis. Nevertheless, the observations made onBeyrichosteus are questioning the assignment of the Pholidosteidae to the Coccosteomorphi.

Keywords

Pisces Placodermi anatomy endoskeleton Devonian Eifel hills 

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Copyright information

© E. Schweizerbart’sche Verlagsbuchhandlung 2003

Authors and Affiliations

  • Markus Otto
    • 1
  1. 1.BerlinGermany

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