Acamptonectes
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![Left prootic of Acamptonectes densus compared to that of other ophthalmosaurids.
A–C: A. densus (GLAHM 132588, holotype), in posterior view (A,B) and anterior view (C). D,E: A. densus (SNHM1284-R), in posterior view. F: Platypterygius australis (QMF14339), in posterior view redrawn from Kear [58]. G: Sveltonectes insolitus (IRSNB R269, holotype), in posterior view, from Fischer et al. [34]. H: Ophthalmosaurus icenicus (NHMUK R4522, mirrored), in posterior view, redrawn from Kirton [43]. I: Ophthalmosaurus icenicus (NHMUK R2161), in posterior view, redrawn from Andrews [51]. Abbreviations: amp: ampulla; avsc: impression of the anterior vertical semicircular canal; hsc: impression of the horizontal semicircular canal; M.a.m.e. facet: facet for attachment of musculus adductor mandibulae externus; sac: sacculus; ut: utriculus.](https://upload.wikimedia.org/wikipedia/commons/thumb/b/bc/Left_prootic_of_Acamptonectes.png/960px-Left_prootic_of_Acamptonectes.png?utm_source=commons.wikimedia.org&utm_campaign=imageinfo&utm_content=thumbnail)
Left prootic of Acamptonectes densus compared to that of other ophthalmosaurids. A–C: A. densus (GLAHM 132588, holotype), in posterior view (A,B) and anterior view (C). D,E: A. densus (SNHM1284-R), in posterior view. F: Platypterygius australis (QMF14339), in posterior view redrawn from Kear [58]. G: Sveltonectes insolitus (IRSNB R269, holotype), in posterior view, from Fischer et al. [34]. H: Ophthalmosaurus icenicus (NHMUK R4522, mirrored), in posterior view, redrawn from Kirton [43]. I: Ophthalmosaurus icenicus (NHMUK R2161), in posterior view, redrawn from Andrews [51]. Abbreviations: amp: ampulla; avsc: impression of the anterior vertical semicircular canal; hsc: impression of the horizontal semicircular canal; M.a.m.e. facet: facet for attachment of musculus adductor mandibulae externus; sac: sacculus; ut: utriculus.