The name is a reference to Crux, the constellation also known as the Southern Cross, which is prominent in the skies of New Zealand.

[1] Trewick suggested that the small size of Crux was a reason why the genus had been previously overlooked.

[2] Both members of the genus are approximately 17–28 mm (0.67–1.10 in) in length, with antennae of the females being three times longer than their bodies.

Members of Crux are medium-sized, dark brown, with a stocky body and short robust legs.

[1] Crux most closely resembles the New Zealand species Talitropsis sedilloti.