[2] Oniscidea (commonly known by a variety of names including woodlouse, pillbug, slater, roly-poly, potato bug, et al.) serve as hosts.

Infection is associated with decreased responsiveness in the host, increased mortality and the emergence of an iridescent blue or bluish-purple colour due to the reflection of light off a paracrystalline arrangement of virions within the tissues.

The aforementioned 'subspecies' have since been reinterpreted, not as distinct taxonomic entities, but as historical findings of individuals infected with this isopod iridovirus.

In particular, it has been reported in the scientific literature from: An oniscidean fossilised in Early Cretaceous Burmese amber was found that features iridescent blue patches.

George Poinar Jr., an entomologist and palaeontologist studying this fossil, tentatively suggested that the colouration may represent an ancient case of IIV-31.