File:Mesosaurus stapes Laurin & Pineiro (2017) FrontEarthSci 5-88.png

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Two specimens of Mesosaurus tenuidens with stapes preserved

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Description
English: Original figure caption: Two specimens of Mesosaurus tenuidens with the stapes. Almost complete fetus at an advanced stage of development (FC-DPV 2504) in (A) general view, with a picture (B) and labeled line drawing (C) of the braincase, including occipital elements and stapes, which have been displaced from the rest of the specimen. Picture (D) and labeled line drawing (E) of a second, almost complete but slightly disarticulated adult specimen (FC–DPV 3067) showing the braincase with the right stapes approximately in its anatomical position (though its distal tip has moved anteriorly). In the interpretive drawings (C,E), the stapes is highlighted in yellow. Both specimens are from the Early Permian Mangrullo Formation of Uruguay. Scale for (D,E) 10 mm. Anatomical abbreviations: ask, anterior skull; bo, basioccipital; bpt, basipterygoid; cev, cervical vertebrae; eo, exoccipital; ga, gastralia; op, opistotic; pbs, parabasisphenoid; pro, prootic; psk, posterior skull; qj, quadratojugal; so, supraoccipital; sta, stapes.

Deutsch: Zwei Exemplare von Mesosaurus tenuidens mit erhaltenen Stapes. (A) Nahezu vollständiger Fötus in fortgeschrittenem Entwicklungsstadium (FC-DPV 2504) in kompletter Ansicht. (B) Detailfoto und (C) beschriftete Linienzeichnung des erhaltungsbedingt vom Rest des Schädels getrennten Hirnschädels des Fötus, einschließlich Elementen des Hinterhauptes und der Stapes. (D) Foto und (E) beschriftete Linienzeichnung eines nahezu vollständigen, leicht disartikulierten ausgewachsenen Individuums (FC–DPV 3067) zeigen die Hirnkapsel mit dem rechten Stapes in annähernd anatomischer Position (auch wenn sein distales Ende etwas nach vorn verschoben ist). In den interpretativen Zeichnungen (C, E) sind die Stapes jeweils gelb gekennzeichnet. Beide Exemplare sind aus der unterpermischen Mangrullo-Formation von Uruguay (laterales Äquivalent der Irati-Formation Brasiliens). Maßstab für (D, E) 10 mm. Anatomische Abkürzungen: ask, vorderer Schädel; bo, Basioccipitale; bpt, Basipterygoid(fortsatz); cev, Halswirbel; eo, Exoccipitale; ga, Gastralia; op, Opisthoticum; pbs, Parabasisphenoid; pro, Prooticum; psk, hinterer Schädel; qj, Quadratojugale; so, Supraoccipitale; sta, Stapes.
Date (publication date)
Source Fig. 3 in: A Reassessment of the taxonomic position of mesosaurs, and a surprising phylogeny of Early Amniotes. Frontiers in Earth Science 5:88, doi:10.3389/feart.2017.00088
Author Michel Laurin, Graciela H. Piñeiro
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(Reusing this file)		 This image was published in Frontiers in Earth Science journal. On the website that contains the HTML version of the respective article (see DOI link above) it is stated that it “is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice.”

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current20:57, 21 January 2019Thumbnail for version as of 20:57, 21 January 20191,992 × 1,983 (4.29 MB)Gretarsson (talk | contribs){{Information |description ={{en|1=Original figure caption: ''Two specimens of Mesosaurus tenuidens with the stapes. Almost complete fetus at an advanced stage of development (FC-DPV 2504) in (A) general view, with a picture (B) and labeled line drawing (C) of the braincase, including occipital elements and stapes, which have been displaced from the rest of the specimen. Picture (D) and labeled line drawing (E) of a second, almost complete but slightly disarticulated adult specimen (FC–DPV...

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