Hydrophorinae

Naglis, Stefan M., 2011, Revision of the genus Oedematopus (Diptera, Dolichopodidae) with the description of a new genus and a key to the Neotropical genera of Hydrophorinae, Zootaxa 2756, pp. 40-52 : 41

Key to tribes and genera of Neotropical Hydrophorinae

1 Arista apical; posterior mesonotum flattened (Aphrosylini)................................................... 2

- Arista dorsal or subapical; posterior mesonotum not flattened................................................. 4

2 Vertical setae positioned halfway between antennae and anterior ocellus......................................... 3

- Vertical setae positioned on level of anterior ocellus........................................ Paraphrosylus Becker

3 Fore basitarsus in males modified and shorter than tarsomere 2; acrostichal setae small and biseriate....................................................................................................... Thambemyia Oldroyd

- Fore basitarsus in males not modified; acrostichal setae absent................................... Cymatopus Kertész

4 Crossvein dm-cu shorter than distal section of CuA; antennae and legs at least partially yellow (Thinophilini)................................................................................................ Thinophilus Wahlberg

- Crossvein dm-cu equal or longer than distal section of CuA; antennae and legs usually dark (Hydrophorini)............. 5

5 Mesonotum with silvery white pruinosity; acrostichal setae absent; crossvein dm-cu parallel or at acute angle to posterior wing margin ( Figs. 1 A-D); vertical setae absent.................................................................. 6

- Mesonotum usually without silvery pruinosity; acrostichal setae usually present; crossvein dm-cu at distinct angle to posterior wing margin; vertical setae present....................................................................... 7

6 Crossvein dm-cu parallel to posterior wing margin ( Figs. 1 A–C); postvertical setae absent; male fore tarsomeres unmodified; cercus simple..................................................................... Oedematopus Van Duzee

- Crossvein dm-cu at acute angle to posterior wing margin ( Fig. 1 D), short postvertical setae present; male fore tarsomeres mod- ified ( Fig. 6 ); cercus with two arms................................................... Oedematopiella gen. nov.

7 Proepimeron with ventral digitiform projection behind base of fore coxa; hind coxa with a strong lateral seta Liancalus Loew

- Proepimeron without digitiform projection at base of fore coxa; hind coxa without strong lateral seta.................. 8

8 Anepimeron with tuft of fine hairs in front of posterior spiracle................................. Hydatostega Philippi Anepimeron bare in front of posterior spiracle............................................... Hydrophorus Fallén

Figures

FIGURE 1. Posterior part of wing: (A) Oedematopus crassitibia Van Duzee; (B) Oedematopus moraviensis sp. nov.; (C) Oedematopus vidua (Becker); (D) Oedematopiella sarae sp. nov. (scale bare = 0.5 mm).

FIGURE 6. Oedematopiella sarae sp. nov., male fore tarsomeres, left lateral view (scale bare = 0.1 mm).