Oleia Andersen et Mendes, 2007

Silva, Fabio Laurindo Da & Song, Chao, 2018, Oleia fieldsi sp. n., a new Orthocladiinae (Diptera: Chironomidae) species from the Brazilian Atlantic rainforest, Zootaxa 4526 (1), pp. 96-100 : 97

Key to the adult males of Oleia Andersen et Mendes

1. Gonostylus bipartite, including one basal accessory branch..................................................... 2

- Gonostylus tripartite, including two basal accessory branches................................................... 3

2. Gonostylar median branch with row of 13 moderately strong setae. Anal point long with about 17 strong, lateral setae and about 9 strong setae at base. Inferior volsella broadly rounded........................ O. bipartita Andersen et Mendes

- Gonostylar median branch with row of 17 very strong, spine-like setae. Anal point with 12 lateral setae and 4 setae at base. Inferior volsella bluntly subtriangular............................................. O. spinosa Andersen et Mendes

3. Gonostylar median branch deeply split, appearing as two separate, narrow lobes. Anal point ventrally bent........................................................................................... O. camura Andersen et Mendes

- Gonostylar median branch subtriangular to oblong. Anal point posteriorly projected................................. 4

4. Gonostylus and its median branch connected by membrane.......................... O. boraceia Andersen et Mendes

- Gonostylus and its median branch connected basally only...................................................... 5

5. Gonostylar median branch with row of flattened, comb-like setae in addition to strong and curved setae.............................................................................................. O. ultima Andersen et Mendes

- Gonostylar median branch without row of flattened, comb-like setae............................................ 6

6. Gonostylar median branch with row of 12 comparatively long setae. Anterior, hyaline branch narrow and parallel-sided............................................................................. O. amazonica Andersen et Mendes

- Gonostylar median branch with row of 8–15 strong, spine-like setae. Anterior, hyaline branch spoon-shaped............. 7

7. Anal point basally broad. Gonostylar anterior branch with 5 strong setae................. O. fieldsi Silva et Song sp. n.

- Anal point basally narrow. Gonostylar anterior branch bare........................... O. hamata Andersen et Mendes