[3][4] This species used to constitute the monotypic genus Altigius, but molecular phylogenetic analyses have shown it to be close relative of the then-monotypic Hamptophryne, and the two genera have been merged.

[5] The generic name Altigius honors Ronald Altig, specialist in amphibian larvae.

[2] The species description is based on a single adult male and series of tadpoles, one of them reared past metamorphosis.

[2] Natural habitats of Hamptophryne alios are tropical moist lowland forests in association with temporary swamps and permanent waterbodies.

[1] The Brazilian record is based on two individuals captured near the Madeira River, in area that may become flooded because of development of hydro power.