Invalid subtaxa: Eurypterygius Jaekel 1904, Gryphus Wagler 1830, Ichthyosaurus advena Phillips 1871 [nomen nudum], Ichthyosaurus aequalis Phillips 1871 [nomen dubium], Ichthyosaurus bodenbenderi Dames 1893 [nomen dubium], Ichthyosaurus californicus Camp 1942 [nomen dubium], Ichthyosaurus chalarodeirus Seeley 1869 [nomen nudum], Ichthyosaurus dilatatus Phillips 1871 [nomen dubium], Ichthyosaurus franciscanus Camp 1942 [nomen dubium], Ichthyosaurus hildesiensis Koken 1883 [nomen dubium], Ichthyosaurus hygrodeirus Seeley 1969 [nomen nudum], Ichthyosaurus immanis Phillipi 1895 [nomen dubium], Ichthyosaurus lacunosae Quenstedt 1885 [nomen dubium], Ichthyosaurus latifrons Konig 1825 [nomen dubium], Ichthyosaurus ovalis Phillips 1871 [nomen dubium], Ichthyosaurus posthumus Wagner 1851 [nomen dubium], Ichthyosaurus steleodon Bogolubow 1909 [nomen dubium], Ichthyosaurus thyreospondylus Owen 1840 [nomen dubium], Ichthyosaurus zollerianus Quenstedt 1858 [nomen dubium], Leptopterygius latifrons Konig 1825 [nomen dubium], Macropterygius dilatatus Phillips 1871 [nomen dubium], Macropterygius ovalis Phillips 1871 [nomen dubium], Macropterygius thyreospondylus Owen 1840 [nomen dubium], Proteosaurus Home 1819, Protoichthyosaurus Appleby 1979, Tibetosaurus Dong 1982 [nomen dubium]
Parent taxon: Thunnosauria according to V. Fischer et al. 2013
Sister taxa: Baracromia, Ichthyosauridae, Malawania, Stenopterygiidae
Subtaxa: Ichthyosaurus acutirostris, Ichthyosaurus breviceps, Ichthyosaurus carinatus, Ichthyosaurus communis, Ichthyosaurus conybeari, Ichthyosaurus hercnyicus, Ichthyosaurus indicus, Ichthyosaurus intermedius, Ichthyosaurus latimanus, Ichthyosaurus platyodon, Ichthyosaurus polyptychodon, Ichthyosaurus rheticus, Ichthyosaurus trigonodon, Protoichthyosaurus prosostealis, Protoichthyosaurus prostaxalis
Ecology: nektonic carnivore