Right opisthotics of Acamptonectes densus compared to that of other ophthalmosaurids.

A: A. densus (GLAHM 132588, holotype), in posterolateral view showing the lateral ridge. B,C: A. densus (SNHM1284-R), in ventral view showing the peculiar thickened lateral foot. D,E: A. densus (GLAHM 132588, holotype), in otic (anteromedial) view. F,G: A. densus (SNHM1284-R), in otic view. H: Ophthalmosaurus icenicus (NHMUK R4523), in otic view, redrawn from Kirton [43]. I: Platypterygius australis (AM F98273), in otic view, redrawn from Kear [58]. J: Mollesaurus periallus (MOZ 2282, holotype), in otic view, redrawn from Fernández [45]. Abbreviations: amp: ampulla; bof: basioccipital facet; hsc: impression of the horizontal semicircular canal; pvsc: impression of the posterior vertical semicircular canal; sac: sacculus; ut: utriculus; vag: vagus foramen. Date 2012 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† Permission
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