Arthropterygius, MAXWELL, 2010

Campos, Lisandro, Fernández, Marta S. & Herrera, Yanina, 2020, A new ichthyosaur from the Late Jurassic of north- west Patagonia (Argentina) and its significance for the evolution of the narial complex of the ophthalmosaurids, Zoological Journal of the Linnean Society 188, pp. 180-201 : 184

GENUS ARTHROPTERYGIUS MAXWELL, 2010

Type species: Arthropterygius chrisorum ( Russell, 1993) Maxwell, 2010 .

Amended diagnosis: Ophthalmosaurid ichthyosaur characterized by the following unique combination of characters: basioccipital facet equal or wider than dorsal plateau of basisphenoid; short basipterygoid processes giving to basisphenoid a square outline in dorsal view [as in Gengasaurus (Paparella et al., 2016), Ichthyosaurus communis De la Beche & Conybeare , 1 8 2 2, Maiaspondylus (Maxwell & Caldwell, 2006) , Stenopterygius quadriscissus (Quenstedt, 1856) , Sveltonectes ( Fischer et al., 2011) and Temnodontosaurus (Lydekker, 1889) ]; internal carotid foramen piercing basioccipital facet of basioccipital [shared only with Palvennia ( Druckenmiller et al., 2012) ]; humerus with a posteriorly deflected ulnar facet [as in Acamptonectes ( Fischer et al., 2012) , Baptanodon natans (Marsh, 1879) , Janusaurus ( Roberts et al., 2014) , Ophthalmosaurus icenicus Seeley, 1874 and Undorosaurus gorodischensis Efimov, 1999 ]; strong dorsoventral compression of posterior half of humerus (shared with Janusaurus and Keilhauia ( Delsett et al., 2017)]; reduced deltopectoral crest (as in Janusaurus ) and humeral torsion poorly developed.

ARTHROPTERYGIUS THALASSONOTUS CAMPOS ,