Pessopteryx

Pessopteryx is an extinct genus of ichthyosaur from the Early Triassic (Olenekian) of Svalbard, Norway. The genus and two species, "P. nisseri" and "P. pinguis", were named in 1910 by Carl Wiman. Its synonyms are "Omphalosaurus nisseri", "Merriamosaurus" (possibly a separate genus) and "Rotundopteryx". The genus "Pessopteryx" was transferred to the genus "Grippia" in 1929 but "Pessopteryx" was later re-separated from "Grippia".