It is one of the many species and subspecies regionally termed as marbled geckos.

The species is one of three in the genus Christinus, placed in the Gekkonidae (gecko) subfamily Gekkoninae, and was first described by Glen Storr in 1987,[2] as Phyllodactylus marmoratus alexanderi, before being elevated to its current status as Christinus alexanderi.

[4] The superficial appearance of this species is similar to that of Christinus marmoratus, the more widespread marbled gecko, but is distinguished by its scales at the nostril and chin.

[6] The males are recorded as sexually active from January to May, but the females do not produce eggs until the spring, September to October.

[6] The species is endemic to the Nullarbor Plain, occurring in most habitats of the region.