Pseudosphromenus dayi or Indian spiketail betta is a species of freshwater ray finned fish from the subfamily Macropodusinae, part of the gourami family Osphronemidae.

It occurs in Kerala on both the coastal regions and the Western Ghats.

The females lays eggs which drop to the substrate and are picked up by both fishes in the pair and placed in the bubble nest.

[1] The name Polyacanthus cupanus dayi was first published in 1908 by Köhler in 1908 but Catalog of Fishes refers to this as a nomen nudum and attributes the valid use of the name, with a formal description, to P. Engmann in 1909.

[3] The specific name honors the British ichthyologist and author of the Fishes of India, Francis Day (1830–1889).