Haploclastus is a genus of Indian tarantulas (family Theraphosidae) that was first described by Eugène Simon in 1892. The genus Phlogiodes has been synonymized with Haploclastus by some authors.
They can be distinguished by the deep and procured fovea, with horizontal thornlike hairs in two or three rows above and below the maxillary. These hairs have a long tapering, they are modified and aligned vertically in a "diffuse" pattern on the maxilla.
The genus Haploclastus was first described by Eugène Simon in 1892. In 1899, Reginald Pocock erected the genus Phlogiodes. He described two species, Phlogiodes validus from a male specimen and Phlogiodes robustus from a female specimen. The relationship between the genera Haploclastus and Phlogiodes has varied; in 1985, Raven sank Phlogiodes into Haploclastus. In 2010, the two Phlogiodes species were synonymized and transferred to Haploclastus as Haploclastus validus. In 2013, H. validus was restored to Phlogiodes, the placement accepted by the World Spider Catalog .
, the World Spider Catalog accepted seven species, all found in India: