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A partial plesiosaurian braincase from the Upper Cretaceous of Sweden

Sachs, Sven; Lindgren, Johan LU and Siversson, Mikael (2016) In Geological Society Special Publication 434(1). p.293-301
Abstract

A partial exoccipital-opisthotic from the uppermost lower Campanian (Upper Cretaceous) of the Åsen locality, Kristianstad Basin, southernmost Sweden, is described and illustrated. The fossil represents the first braincase element of a plesiosaur found in Sweden. It includes the chamber for the ampulla and utriculus, openings for the caudal vertical and horizontal semicircular canals, and four foramina for cranial nerves. The incomplete braincase can be referred to an elasmosaurid plesiosaur, and closely resembles the exoccipital-opisthotic of Libonectes morgani and a referred specimen of Aristonectes parvidens. Although we discuss putative postcranial material of the elasmosaurid subfamily Aristonectinae in the uppermost lower Campanian... (More)

A partial exoccipital-opisthotic from the uppermost lower Campanian (Upper Cretaceous) of the Åsen locality, Kristianstad Basin, southernmost Sweden, is described and illustrated. The fossil represents the first braincase element of a plesiosaur found in Sweden. It includes the chamber for the ampulla and utriculus, openings for the caudal vertical and horizontal semicircular canals, and four foramina for cranial nerves. The incomplete braincase can be referred to an elasmosaurid plesiosaur, and closely resembles the exoccipital-opisthotic of Libonectes morgani and a referred specimen of Aristonectes parvidens. Although we discuss putative postcranial material of the elasmosaurid subfamily Aristonectinae in the uppermost lower Campanian of southernmost Sweden, the exoccipital-opisthotic from Åsen most likely belongs to a juvenile individual of a non-aristonectine elasmosaur.

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author
organization
publishing date
type
Chapter in Book/Report/Conference proceeding
publication status
published
subject
in
Geological Society Special Publication
volume
434
issue
1
pages
9 pages
publisher
Geological Society of London
external identifiers
  • scopus:84970044604
ISSN
03058719
DOI
10.1144/SP434.7
language
English
LU publication?
yes
id
198ade54-bc47-4c40-bd37-929eabae6de1
date added to LUP
2017-02-23 16:33:45
date last changed
2017-10-08 04:59:13
@inbook{198ade54-bc47-4c40-bd37-929eabae6de1,
  abstract     = {<p>A partial exoccipital-opisthotic from the uppermost lower Campanian (Upper Cretaceous) of the Åsen locality, Kristianstad Basin, southernmost Sweden, is described and illustrated. The fossil represents the first braincase element of a plesiosaur found in Sweden. It includes the chamber for the ampulla and utriculus, openings for the caudal vertical and horizontal semicircular canals, and four foramina for cranial nerves. The incomplete braincase can be referred to an elasmosaurid plesiosaur, and closely resembles the exoccipital-opisthotic of Libonectes morgani and a referred specimen of Aristonectes parvidens. Although we discuss putative postcranial material of the elasmosaurid subfamily Aristonectinae in the uppermost lower Campanian of southernmost Sweden, the exoccipital-opisthotic from Åsen most likely belongs to a juvenile individual of a non-aristonectine elasmosaur.</p>},
  author       = {Sachs, Sven and Lindgren, Johan and Siversson, Mikael},
  issn         = {03058719},
  language     = {eng},
  number       = {1},
  pages        = {293--301},
  publisher    = {Geological Society of London},
  series       = {Geological Society Special Publication},
  title        = {A partial plesiosaurian braincase from the Upper Cretaceous of Sweden},
  url          = {http://dx.doi.org/10.1144/SP434.7},
  volume       = {434},
  year         = {2016},
}