The genus contains a single species, Igdamanosaurus aegyptiacus, from Maastrichtian-aged marine environments of Africa.

[1] Igdamanosaurus was a small durophagous mosasaur at a size roughly similar to the closely related globidensin Carinodens.

Its fossils preserve blunt, rounded teeth similar to those of the other members of the Globidensini.

[2] Originally named as Globidens aegyptiacus by Otto Zdansky (1935),[3] the species was first recognised as sufficiently distinct to be separated into its own genus by Lingham-Soliar (1991), who named it Igdamanosaurus after the village of Igdaman (sometimes called In Dama), which was near to where the type specimen was found.

[2] Though undoubtedly similar to Globidens in its dental adaptations and similar to G. alabamaensis in possessing unusually small foramina for exits of the mandibular nerve on the lower lateral surface of the dentary, Lingham-Soliar (1991) noted that the vertical striae present in Igdamanosaurus would suggest that it represented a completely new type of durophagous mosasaur that was derived from a Platecarpus-like ancestor rather than a Clidastes-like one and thus classified it as part of the Plioplatecarpinae.