It contains a single species, Kalaallitkigun jenkinsi, which was described in 2020 from a partial dentary (lower jaw) found in the Fleming Fjord Formation.

More specifically, it was found in the mid-late Norian (~215 Ma) Carlsberg Fjord beds of the Ørsted Dal Member.

The postdentary trough slopes upwards and is divided from the overlying coronoid fossa via a strong ridge.

The masseteric fossa (on the outer rear surface of the dentary) is voluminous but shifted back past the level of the last molariform.

The preserved premolariform tooth is single-rooted and simple, with a larger cusp at the front and a much smaller one at the back.