File:Basioccipital and basisphenoid of Acamptonectes sp.png

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Basioccipital and basisphenoid ichthyosaur fossils from Cambridge Greensand Formation assigned to Acamptonectes sp. in 2014, but to Ophthalmosaurinae indet in 2014.[1]

A–C: basioccipital (CAMSM B57962) in posterior view (A), dorsal view (B), and posteroventral view (C), showing the important extracondylar area (delimited by the broken line). The specimen is the only one of the Cambridge Greensand Formation to exhibit a bilobed concavity for the foramen magnum. D,E; basisphenoid (NHMUK R2341) in lateral (view (D) and posterior view (E), showing the facialis nerve foramen posterior to the basipterygoid process and the pentagonal posterior surface because of the dorsal crest that is characteristic for the genus. Abbreviation: bpp: basipterygoid process; eca: extracondylar area; fm: bilobed concavity for the foramen magnum; VII: foramen for the facialis nerve (VII).
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Source http://www.plosone.org/article/info%3Adoi%2F10.1371%2Fjournal.pone.0029234
Author Valentin Fischer, Michael W. Maisch, Darren Naish, Ralf Kosma, Jeff Liston, Ulrich Joger, Fritz J. Krüger, Judith Pardo Pérez, Jessica Tainsh, Robert M. Appleby†
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current21:21, 18 July 2019Thumbnail for version as of 21:21, 18 July 20191,984 × 1,023 (1.52 MB)FunkMonk (talk | contribs)== {{int:filedesc}} == {{Information |Description=Basioccipital and basisphenoid of Acamptonectes sp. from Cambridge Greensand Formation. A–C: basioccipital (CAMSM B57962) in posterior view (A), dorsal view (B), and posteroventral view (C), showing the important extracondylar area (delimited by the broken line). The specimen is the only one of the Cambridge Greensand Formation to exhibit a bilobed concavity for the foramen magnum. D,E; basisphenoid (NHMUK R2341) in lateral (view (D) and post...

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