A new sawshark, <i>Pristiophorus laevis</i>, from the Eocene of Antarctica with comments on <i>Pristiophorus lanceolatus</i>

The highly fossiliferous Eocene deposits of the Antarctic Peninsula are among the most productive sites for fossil remains in the Southern Hemisphere and offer rare insights into high-latitude faunas during the Palaeogene. Chondrichthyans, which are represented by abundant isolated remains, seemingl...

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Autores principales: Engelbrecht, Andrea, Mörs, Thomas, Reguero, Marcelo Alfredo, Kriwet, Jürgen
Formato: Articulo
Lenguaje:Inglés
Publicado: 2016
Materias:
Ciencias Naturales
Seymour Island
Palaeogene
Southern Ocean
Pristiophoridae
new taxon
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/108333
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-108333
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ciencias Naturales
Seymour Island
Palaeogene
Southern Ocean
Pristiophoridae
new taxon
spellingShingle Ciencias Naturales
Seymour Island
Palaeogene
Southern Ocean
Pristiophoridae
new taxon
Engelbrecht, Andrea
Mörs, Thomas
Reguero, Marcelo Alfredo
Kriwet, Jürgen
A new sawshark, <i>Pristiophorus laevis</i>, from the Eocene of Antarctica with comments on <i>Pristiophorus lanceolatus</i>
topic_facet Ciencias Naturales
Seymour Island
Palaeogene
Southern Ocean
Pristiophoridae
new taxon
description The highly fossiliferous Eocene deposits of the Antarctic Peninsula are among the most productive sites for fossil remains in the Southern Hemisphere and offer rare insights into high-latitude faunas during the Palaeogene. Chondrichthyans, which are represented by abundant isolated remains, seemingly dominate the marine assemblages. Eocene Antarctic sawsharks have only been known from few isolated rostral spines up to now, that were assigned to Pristiophorus lanceolatus. Here, we present the first oral teeth of a sawshark from the Eocene of Seymour Island and a re-evaluation of previously described Pristiophorus remains from Gondwana consisting exclusively of rostral spines. The holotype of Pristiophorus lanceolatus represents a single, abraded and insufficiently illustrated spine from the Oligocene of New Zealand. All other Cenozoic rostral spines assigned to this species are morphologically very indistinct and closely resemble those of living taxa. Consequently, we regard this species as dubious and introduce a new species, Pristiophorus laevis, based on oral teeth. The combination of dental characteristics of the new species makes it unique compared to all other described species based on oral teeth. Rostral spines from the Eocene of Seymour Island are assigned to this new species whereas those from other Cenozoic Gondwana localities remain ambiguous.
format Articulo
Articulo
author Engelbrecht, Andrea
Mörs, Thomas
Reguero, Marcelo Alfredo
Kriwet, Jürgen
author_facet Engelbrecht, Andrea
Mörs, Thomas
Reguero, Marcelo Alfredo
Kriwet, Jürgen
author_sort Engelbrecht, Andrea
title A new sawshark, <i>Pristiophorus laevis</i>, from the Eocene of Antarctica with comments on <i>Pristiophorus lanceolatus</i>
title_short A new sawshark, <i>Pristiophorus laevis</i>, from the Eocene of Antarctica with comments on <i>Pristiophorus lanceolatus</i>
title_full A new sawshark, <i>Pristiophorus laevis</i>, from the Eocene of Antarctica with comments on <i>Pristiophorus lanceolatus</i>
title_fullStr A new sawshark, <i>Pristiophorus laevis</i>, from the Eocene of Antarctica with comments on <i>Pristiophorus lanceolatus</i>
title_full_unstemmed A new sawshark, <i>Pristiophorus laevis</i>, from the Eocene of Antarctica with comments on <i>Pristiophorus lanceolatus</i>
title_sort new sawshark, <i>pristiophorus laevis</i>, from the eocene of antarctica with comments on <i>pristiophorus lanceolatus</i>
publishDate 2016
url http://sedici.unlp.edu.ar/handle/10915/108333
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