Old references refer to Runchomyia (Runchomyia) paranensis. It is currently located in the genus Isostomyia. This species was synonymized under lunatus (Theobald) by Lane & Cerqueira (1942) but resurrected by García & Casal (1965). Some of the argentine literature refers to this species as lunatum (lunatus) (Mitchel & Darsie, 1985). The taxonomic location of this species was clarified in Campos and Zavortink (2010).
Isostomyia paranensis is sylvan and associated with areas that flood. Immature stages were found living in leaf axils of Androtrichum giganteum (Cyperaceae), coexisting with larvae of Wyeomyia leocostigma in spite of the low water volume retained by the plants. Third- and fourth-instar larvae of Isostomyia paranensis are facultative predators. They usually grab mosquito prey by the mid-abdomen, ingest the internal tissue, and then reject the skin. Adults are present from October to May in Argentina, with maximum abundance in March and April, and are most active at sundown (Maciá 1995).