Extinct arachnids

species of arachnid

Stipax is a genus of spiders in the family Sparassidae, with a single species, Stipax triangulifer, first described in 1898. The description was based on a male collected in 1894. No specimens have been found since and the species has been declared extinct. It was endemic to Mahe Island in the Seychelles.

Akrav israchanani () is an extinct species of scorpions from the Ayalon Cave in Israel. It is the only species in the genus Akrav and the family Akravidae.

Pleorotus was a monotypic genus of Seychelloise huntsman spiders containing the single species, Pleorotus braueri. It was first described by Eugène Louis Simon in 1898, and was endemic to the Seychelles. The description was based on a single male collected on Mahe Island in 1894, but none have been found in later collections, and it has been declared extinct.

Thomasettia is a genus of spiders in the family Sparassidae, with a single species, Thomasettia seychellana, first described in 1911. It has not been found since, and has been declared extinct. It was endemic to Mahe Island and Silhouette Island in the Seychelles.