P. walkeri is known from the Maastrichtian of southwest Niger,[3] whereas P. calabaria is found in slightly older (late Campanian) deposits in Nigeria.

Pluridens was briefly synonymized with Halisaurus by Lindgren and Siverson (2005),[5] but subsequent studies rejected the synonymy.

[3] Lingham-Soliar (1998)[3] listed the following unambiguous character states for the genus: "Very long, slender dentary, anterior half cross-section almost circular extending to tip.

The unusually high amount of teeth present in the dentaries of both species of Pluridens initially made it difficult to immediately assign a classification on the subfamily level.

The type specimen of P. walkeri is BMNH R14153, an almost complete dentary recovered from the Maastrichtian Farin-Doutchi Formation near Mount Ilatarda, Niger.

Lingham-Soliar (1998) also assigned BMNH R9804, a partial dentary with poorly preserved teeth (one out of which is almost complete) from the late Campanian of the Nkporo Formation near Calabar in southern Nigeria, to P.

[3] The Nigerian specimen BMNH R9804 was reassigned to its own species by Longrich (2016) as it lacks many of the derived features that characterize P. walkeri, such as a high tooth count and extreme elongation of the dentary.