The genus name Goulmimichthys is a combination of the Greek ichthys, "fish" and Goulmima, the city in Morocco where the holotype fossils were found.

[4] The anterior process of the pelvic bone of Goulmimichthys has the same length as the four central abdominal vertebrae, a typical characteristic of the genus.

[6] Fossils of the type species of Goulmimichthys have been described from the Lower Turonian Akrabou Formation near Goulmima in eastern Morocco.

[9] The fossil fishes were found in associations with other fossil genera, as in Mexico Nursallia gutturosum, Rhynchodercetis regio, Tselfatia formosa, Vallecillichthys multivertebratum,[10] in Morocco Ghrisichthys and Enchodus,[11] and in Colombia Pachyrhizodus etayoi and Bachea huilensis.

[8] Alongside the fossil fish assemblages, the fossils of plesiosaurs as Mauriciosaurus fernandezi and Vallecillosaurus donrobertoi in Mexico, the mosasaur Yaguarasaurus columbianus in Colombia and the basal mosasaur Tethysaurus nopcsai and turtles in Morocco were recovered.