NDLI: A new sea cow record from the lower Oligocene of western Germany: new indications on the skeletal morphology of Halitherium schinzii (Mammalia: Sirenia)

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A new sea cow record from the lower Oligocene of western Germany: new indications on the skeletal morphology of Halitherium schinzii (Mammalia: Sirenia)

Content Provider	Springer Nature Link
Author	Voss, Manja
Copyright Year	2011
Abstract	Since the discovery of the extinct species Halitherium schinzii in the Mainz Basin, sirenian remains from the German Oligocene are usually assigned to this taxon according to the assumption that this would be the only sea cow species there. The attempts of several authors to determine morphological distinctions on the species level remain unconsidered until today. The new find of a partial sea cow skeleton from the lower Oligocene of Bottrop-Kirchheller Heide (western Germany) stirs up the debate on splitting the species currently referred to as H. schinzii. The Bottrop specimen morphologically corresponds to skullcaps from the Mainz Basin and the Belgian Oligocene, which were the basis for the introduction of new species in the past, but are considered synonymous with H. schinzii today. Despite its fragmentary preservation, the new sirenian record reveals shared morphological features mainly referring to the supraoccipital, such as a distinctly rostrad indenting nuchal crest and a reduced external occipital protuberance. These features are in contrast to the prominent morphology of the specimens generally associated with H. schinzii and support the assumed presence of at least two morphotypes in the Oligocene of Central Europe. Additionally, the sea cow from Bottrop-Kirchheller Heide represents the first occurrence of skeletal elements, which are not preserved in the known specimens from this morphotype so far and may contribute to a better understanding of intra- and/or interspecific differences within Sirenia.Skelettreste von Seekühen aus dem Oligozän Deutschlands werden üblicherweise zu der ausgestorbenen Art Halitherium schinzii aus dem Mainzer Becken gestellt, unter der Annahme sie sei das einzige dort vorkommende Taxon. Bestrebungen diverser Autoren morphologische Unterscheidungen auf Artniveau vorzunehmen bleiben bis heute unberücksichtigt. Der neue Fund eines Teilskeletts aus dem Unteroligozän von Bottrop-Kirchheller Heide (Westdeutschland) schürt die Debatte, derzeit zu H. schinzii zugeordnete Arten als eigenständig zu betrachten. Das Bottroper Exemplar zeigt morphologische Ähnlichkeiten zu Schädeldächern aus dem Mainzer Becken und dem Belgischen Oligozän, auf deren Basis in der Vergangenheit neue Arten postuliert wurden, die aber heute synonym mit H. schinzii betrachtet werden. Trotz der unvollständigen Erhaltung bestehen Gemeinsamkeiten hauptsächlich im Bereich des Supraoccipitale, z.B. in einer rostrad einspringenden Crista nuchae und einer niedrigen Protuberancia occipitalis externa. Diese Merkmale sind konträr zu der prominenten Morphologie typischer Vertreter der Art H. schinzii und untermauern die Hypothese vom Vorhandensein von zumindest zwei Morphotypen im zentraleuropäischen Oligozän. Mit der Seekuh aus Bottrop-Kirchheller Heide werden zum ersten Mal Skelettreste beschrieben, die bei den bisher bekannten Vertretern dieses Morphtyps nicht erhalten sind und zu einem besseren Verständnis von intra- und/oder interspezifischen Unterschieden innerhalb der Sirenia beitragen können.
Starting Page	205
Ending Page	217
Page Count	13
File Format	PDF
ISSN	00310220
Journal	Paläontologische Zeitschrift
Volume Number	86
Issue Number	2
e-ISSN	18676812
Language	English
Publisher	Springer-Verlag
Publisher Date	2011-11-19
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Sirenia Lower Oligocene Central Europe Halitherium Taxonomy Morphological variation Paleontology
Content Type	Text
Resource Type	Article
Subject	Paleontology

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