†Stenopterygius quadriscissus Quenstedt 1858 (ichthyosaur)
Belongs to Stenopterygius according to V. Fischer et al. 2013
Sister taxa: Stenopterygius aaleniensis, Stenopterygius cuneiceps, Stenopterygius longifrons, Stenopterygius longipes, Stenopterygius macrophasma, Stenopterygius megacephalus, Stenopterygius megalorhinus, Stenopterygius triscissus, Stenopterygius uniter
Type specimen: GPIT 43/0219-1. Its type locality is Holzmaden, Univ Löwen, epsilon II/3, which is in a Toarcian marine shale in the Posidonienschiefer Formation of Germany.
Ecology: nektonic carnivore