Pseudoaerumnosa, Rudzinski, 2006

Vilkamaa, Pekka, Halenius, Pentti & Ševčík, Jan, 2019, Review of Pseudoaerumnosa Rudzinski (Diptera, Sciaridae), with the description of twenty-four new species, Zootaxa 4656 (1), pp. 1-42 : 5-6

Key to the species of Pseudoaerumnosa (males)

Note. The species of Pseudoaerumnosa are mostly difficult to identify. The size, number and arrangement of the gonostylar megasetae, important for identification of species in many genera of Sciaridae , are often almost identical. Minor differences in the relative length and width of the gonocoxa and gonostylus and in the form of the tegmen, appear important. Care must be taken that the tegmen does not change its form during the preparation which occurs easily if specimens are treated with KOH or if DNA extraction methods are used. Furthermore, the size and form of the apical tooth of the gonostylus may vary depending on the position of the tooth in preparations.

1 Tegmen with finger-like apical process.................................................................... 2

- Tegmen without finger-like process....................................................................... 4

2 Gonostylar megasetae with robust basal bodies, finger-like apical process of tegmen narrow, club-like...................................................................................................... P. clavidactyla sp. n.

- Gonostylar megasetae without basal bodies, finger-like apical process of tegmen nearly evenly broad................... 3

3 Tegmen angulate laterally, finger-like process arises from apical margin of tegmen..................... P. eminula sp. n.

- Tegmen smoothly curved laterally, apical process of tegmen arises from dorsal side of tegmen......... P. cryptoloba sp. n.

4 Gonostylus with 1 or 2 megasetae subapically on basal side of apical tooth, and with distinct medial lobe, bearing 2–5 megasetae................................................................................................ 5

- Gonostylus without medial lobe or with indistinct one, megasetae scattered on medial side of gonostylus............... 21

5 Gonostylus with 1 megaseta subapically................................................................... 6

- Gonostylus with 2 megasetae subapically.................................................................. 8

6 Tegmen roundish laterally, hind margin of wing with only dorsal setae............................. P. tenuidens sp. n.

- Tegmen nearly straight or abruptly curved laterally, hind margin of wing with dorsal and ventral setae.................. 7

7 Tegmen nearly straight laterally, gonostylar lobe broad............................................ P. fragilis sp. n.

- Tegmen abruptly curved at middle, gonostylar lobe narrow....................................... P. curvifalx sp. n.

8 Tegmen broadest at about its middle...................................................................... 9

- Tegmen broadest basally.............................................................................. 10

9 Tegmen strongly narrowed towards apex and roundish apically, gonostylus wide, its tooth only slightly curved.................................................................................................. P. ampliata sp. n.

- Tegmen slightly narrowed towards apex and nearly truncate apically, gonostylus more slender, its tooth distinctly curved.......................................................................................... P. impensa sp. n.

10 Tegmen longer than broad.................................................................... P. tkoci sp. n.

- Tegmen as long as or shorter than broad.................................................................. 11

11 Gonostylar lobe with 2 megasetae, megasetae robust and with distinct basal bodies................... P. awanensis sp. n.

- Gonostylar lobe with at least 3 megasetae, megasetae slender and without distinct basal bodies....................... 12

12 Large species, wing length 2.6–3.5 mm, gonostylus tumid.................................... P. inviolata Rudzinski

- Smaller species, wing length 1.4–2.5 mm, gonostylus slender................................................. 13

13 Tegmen nearly straight apically......................................................................... 14

- Tegmen roundish apically.............................................................................. 15

14 Tegmen broader than long, narrowed towards apex, sclerotized basolaterally, gonostylar lobe distinct........ P. annae sp. n.

- Tegmen subquadrangular, weakly sclerotized, gonostylar lobe indistinct.......................... P. quadriquetra sp. n.

15 Tegmen with broad lateral sclerotizations................................................................. 16

- Tegmen without or with only narrow lateral sclerotizations................................................... 17

16 Tegmen sclerotized laterally nearly up to its apex, apical tooth of gonostylus short, with its basal part about ½ of the largest width of gonostylus...................................................................... P. clivicola sp. n.

- Tegmen sclerotized laterally at its basal half only, apical tooth of gonostylus long, with its basal part about 2/3 of the largest width of gonostylus....................................................................... P. formosa sp. n.

17 Tegmen much broader than long........................................................................ 18

- Tegmen at most slightly broader than long, as long as or longer than broad....................................... 19

18 Gonostylus nearly as long as gonocoxa, apical tooth of gonostylus nearly straight, hind margin of wing with dorsal and ventral setae................................................................................... P. exacuta sp. n.

- Gonostylus shorter than gonocoxa, apical tooth of gonostylus curved, hind margin of wing with dorsal setae only................................................................................................ P. acinacea sp. n.

19 Apical tooth of gonostylus constricted subbasally, short, with its basal part about1/4 of the largest width of gonostylus............................................................................................ P. collicola sp. n.

- Apical tooth of gonostylus narrowed from base to apex, long, about ½ of the largest width of gonostylus............... 20

20 Apex of gonostylus strongly narrowed apically, wing vein R1 ending beyond level of base of M-fork...... P. junciseta sp. n.

- Apex of gonostylus broader, wing vein R1 ending at about level of base of M-fork..................... P. obovata sp. n.

21 Gonostylar megasetae of different lengths, tegmen subtriangular..................................... P. banari sp. n.

- Gonostylar megasetae subequal, tegmen different........................................................... 22

22 Gonocoxa and gonostylus subequal in length.............................................................. 23

- Gonocoxa much longer than gonostylus.................................................................. 24

23 Gonostylus narrow, with long apical tooth..................................................... P. consuota sp. n.

- Gonostylus broad, with short apical tooth..................................................... P. saginata sp. n.

24 Tegmen hemispherical, gonostylus with long pointed setae subapically............................. P. filispicata sp. n.

- Tegmen subquadrangular, gonostylus without pointed long setae subapically..................................... 25

25 Gonostylus slender, with 4 megasetae and robust apical tooth, tegmen much broader than long........ P. quadriquetra sp. n.

- Gonostylus more tumid, with 7–8 megasetae and slender apical tooth, tegmen slightly broader than long..................................................................................................... P. pilicaudata sp. n.