Gengasaurus nicosiai was named by Paparella et al. (2017) [The new taxon is distinguished from other ophthalmosaurid ichthyosaurs by the following unique combination of characters: basioccipital with reduced extracondylar area similar in extent to Ophthalmosaurus spp. (extracondylar area less reduced than in Brachypterygius extremus, Arthropterygius chrisorum: Kirton, 1983; Maxwell, 2010); supraoccipital and exoccipital contributing roughly equally to the foramen magnum (supraoccipital contribution far exceeds exoccipital contribution in Ophthalmosaurus natans; exoccipital contribution exceeding supraoccipital contribution in O. icenicus: Gilmore, 1905, 1906; Kirton, 1983); medial ramus of supraoccipital a thin bar (flat and plate-like in O. icenicus: Kirton, 1983); orbit relatively large (ratio between the sclerotic ring and mandible = 0.21); vertebrae in anterior caudal region not extremely shortened (centrum height:length <3.0; >3.0 in O. icenicus, Arthropterygius chrisorum: Massare et al. 2006; Maxwell, 2010); three articular facets on the humerus (only two facets present inNannopterygius enthekiodon and Cryopterygius kristiansenae: Kirton, 1983; Druckenmiller et al. 2012), with the smallest located anteriorly for articulation with a preaxial element (smallest facet for articulation with the intermedium in Aegirosaurus leptospondylus, Brachypterygius extremus: Kirton, 1983; Bardet & Fernández, 2000); unusual condition of the preaxial accessory facet on the humerus, highly anteroproximally deflected either considering the longitudinal axis of the humerus or the radial–ulnar plane, likely shared with Undorosaurus sp. (Efimov, 1999; Arkhangelsky & Zverkov, 2014) (humeral facet for the preaxial element continuous with the radial one in Acamptonectes densus and Ophthalmosaurus icenicus: Kirton, 1983; Fischer et al. 2012); anteroposterior length of radius similar to proximodistal length (unlike Caypullisaurus in which the radius is anteroposteriorly elongate: Fernández, 1997, 2001); radius significantly larger than ulna, with six articular facets for humerus, preaxial element, preaxial carpal, radiale, intermedium, and ulna posteriorly (radius smaller or sub-equal in Cryopterygius kristiansenae, Ophthalmosaurus spp.: Gilmore, 1905, 1906; Kirton, 1983; Druckenmiller et al. 2012).]. It is not extant. Its type specimen is MSVG 39617, a skeleton (A relatively complete individual preserved on a slab, with a disarticulated skull, part of the pectoral girdle, and an articulated vertebral column lacking the ). Its type locality is Camponocecchio, Genga, which is in a Kimmeridgian/Tithonian marine horizon in the Calcari ad aptici e Saccocoma Formation of Italy.