The black flies of the genus
Inaequalium
present a Neotropical distribution, with Panama at the northern limit, and the Argentinian pampas at the southern, but do not occur in the Central Amazon. This study offers a cladistic analysis establishing a hypothesis of relationships between the species of Inaequalium. A total of 37 characters have been considered in order to establish the hypothetic phylogenetic relationships. Cerqueirellum (Py-Daniel, 1983) was considered as outgroup. Data were analyzed using Henning 86 version 1.5. Wich the ie* command and implicit enumeration a unique possible cladogram was obtained in Inaequalium with 52 steps, and a CI of 0.76 and RI of 0.81. Two well-defined clades was obtained in the resulting cladogram, the
" species-group, includes
I. travassosi,
I. souzalopesi,
I. botulibranchium and
I. petropoliense, and the
" species-group, includes
I. rappae,
I. nahimi,
I. inaequale,
I. leopoldense,
I. subnigrum,
I. diversibranchium,
I. mariavulcanoae,
I. nogueirai,
I. beaupertuyi,
I. clavibranchium and
I. subclavibranchium.