Neosilba McAlpine

Galeano-Olaya, Pedro E. & Canal, Nelson A., 2012, New Species Of Neosilba Mcalpine (Diptera: Lonchaeidae) And New Records From Colombia, Papéis Avulsos de Zoologia 52 (31), pp. 361-385 : 363-365

Key for species of Neosilba McAlpine

1. Male terminalia hemispherical-shape.................................................................................................2

1’. Male terminalia not hemispherical-shape ..........................................................................................9

2(1). Filament of the aedeagus long (reaching or beyond the apex of the epandrium), and more or less similar width throughout its length ( major group) ................................................................................3

2’. Filament of the aedeagus short (just reaching the base of the epandrium) and wider in any part of it ( parva group) .................................................................................................................................8

3(2). Wing distinctly fumose to unaided eye, at least on apical half ...........................................................4

3’. Wing practically clear to unaided eye ................................................................................................6

4(3). Wing distinctly bicoloured, apical half brownish, basal half milky-yellow. Margin of scutellum with one or more setulae proximal to basal scutellar bristle.................................... N. dimidiata (Curran)

4’. Wing more uniformly brownish fumose. Margin of scutellum without setulae proximal to basal scutellar bristle ........................................................................................................................................5

5(4’). Calypteres dusky with brownish margins and fringes. Arista extremely shortly plumose, longest hairs about equal to length of basal aristal segment ............................................... N. fuscipennis (Curran)

5’. Calypteres white with whitish fringes. Aristal plumosity about as wide as postpedicel ......................... .................................................................................................................... N. longicerata (Hennig)

6(3’). Aedeagus ventrally flat, not beyond the base of the cerci, surstylus with 4 prensisetae... N. plana sp. nov.

6’. Aedeagus tubular-shape.....................................................................................................................7

7(6’). Aedeagus beyond the apex of the cerci, surstylus with 10 prensisetae at each side... N. major (Malloch)

7’. Aedeagus beyond the base of the cerci, but not reaching their apex, surstylus with 5 prensisetae at each side................................................................................................................... N. tolimensis sp. nov.

8(2’). Filament of the aedeagus expanded distally in ventral view (chalice-shaped)........... N. parva (Hennig)

8’. Filament of the aedeagus expanded basally in ventral view (bottle-shape) ............. N. amphora sp. nov.

9(1’). Epandrium narrow in lateral view, aedeagus short (just longer than C-shape part of the aedeagus) ( peltae group) ...............................................................................................................................10

9’. Epandrium wider than the surstylus or at least 1/3 wider than long ................................................15

10(9). Filament of the aedeagus as wide as C-shape part in lateral view......................................................11

10’. Filament of the aedeagus sligthly thinner than C-shape part in lateral view .....................................14

11(10). Filament of the aedeagus spiculated, apex not with special shape.....................................................12

11’. Filament of the aedeagus not spiculated, apex with a special shape ..................................................13

12(11). Filament of the aedeagus spiculated along its length ............................ N. peltae McAlpine & Steyskal

12’. Filament of the aedeagus spiculated only at apex and at base ................................. N. convexa sp. nov.

13(11’). Apex of the filament of the aedeagus arrow-like shape ........................................ N. mcalpeiniei Strikis

13’. Apex of the filament of the aedeagus crown-like shape ......................................... N. parapeltae Strikis

14(10’). Apex of the aedeagus does not reach the base of the surstylus ................................ N. concava sp. nov.

14’. Apex of the aedeagus beyond the base of the surstylus ............................................ N. ilheuense Strikis

15(9’). Filament of the aedeagus strongly thinner than the C-shape section ( glaberrima group) ..................16

15’. Width of the filament and C-shape section of the aedeagus similar .................................................28

16(15). Aedeagus with a single or pair of processes arising from convex side of thickened C-shape base ( glaberrima subgroup).............................................................................................................................17

16’. Junction of the filament and C-shape of the aedeagus smooth or with some carina or with glomerule-like structure but not with any process ( Certa subgroup) ..............................................................23

17(16). Aedeagus with a pair of tooth-like process .......................................................................................18

17’. Aedeagus with a single process.........................................................................................................20

18(17). Epandrium as long as wide.................................................................................... N. delvechioi Strikis

18’. Epandrium 2 times as long as wide..................................................................................................19

19(18). Apex of male abdomen with a cluster of stout spines, the cluster somewhat divided on middorsal line; paramere with an elongate lade-like medial lobe and a broad, low, shoulder-like, lateral lobe ........... ............................................................................................................. N. glaberrima (Wiedemann)

19’. Apex of male abdomen without stout spines; paramere with two subequally long lobes, the medial one more slender......................................................................................................... N. batesi (Curran)

20(17’). Aedeagus with a spine-like process at the junction of C-shape and the filament...............................21

20’. Process at the junction of C-shape and the filament of the aedeagus different shape ........................22

21(20). Epandrium as long as wide........................................................................... N. bifida Strikis & Prado

21’. Epandrium 2 time as long as wide.................................................................... N. pseudobifida Strikis

22(20’). Aedeagus with a finger-like lobe at the junction of C-shaped and the filament of the aedeagus, apex of the filament beyond the apex of cerci .................................................. N. inesperata Strikis & Prado

22’. Aedeagus with a glomerule-like spiculated at the base of the C-shape of the aedeagus ......................... ................................................................................................................ N. pradoi Strikis & Lerena

23(16’). Aedeagus with a median carina on outer convex side of C-shape .....................................................24

23’. Aedeagus without any structure in the C-shape ...............................................................................25

24(23). Aedeagus cone-like at the base of filament (gradual slimming) ................................. N. certa (Walker)

24’. Aedeagus suddenly slimming at the base of the filament.......................................... N. piracea sp. nov.

25(23’). Filament of the aedeagus with distal spiculae.................................................... N. distospinosa sp. nov.

25’. Filament of the aedeagus not spiculated ..........................................................................................26

26(25’). Surstylus with 6-7 prensisetae arranged in two groups, 2 transversely disposed near midline, and 4-5 longitudinally and laterally disposed at each side ......................... N. oaxacana McAlpine & Steyskal

26’. Surstylus with more than 7 prensisetae at each side .........................................................................27

27(26’). Filament of the aedeagus beyond the prensisetae; surstylus with 10 distal prensisetae at each side not arranged in groups....................................................................................... N. bella Strikis & Prado

27’. Filament of the aedeagus not reaching the prensisetae; surstylus with 9 distal prensisetae at each side.. .................................................................................................................... N. paramerolatus Strikis

28(15’). Apex of the filament of the aedeagus not tapered nor swollen, nor S-shaped, nor bent ....................29

28’. Apex of the filament of the aedeagus strongly or slightly swollen and/or S-shaped and/or bent ( pendula group) ..........................................................................................................................................31

29(28). Filament of the aeddeagus with spiculae ..........................................................................................30

29’. Filament of the aedeagus without spiculae.................................................. N. nigrocaerulea (Malloch)

30(29). 1/3 distal of the filament spiculated..................................................................... N. pantanense Strikis

30’. Flament of the aedeagus with small spiculae at base, surstylus with 6 prensisetae at each side .............. ................................................................................................................................. N. laura Strikis

31(28’). Basal part of the aedeagus circle-shape.............................................................................................32

31’. Basal part of the aedeagus C-shape ..................................................................................................34

32(31’). Epandrium more than 5 times as long as wide in lateral view ......... N. zadolicha McAlpine & Steyskal

32’. Epandrium as long as wide in lateral view .......................................................................................33

33(32’). Surstylus with 12 prensisetae at each side ................................................................ N. orbata sp. nov.

33’. Surstylus with 5 or 6 prensisetae at each side ............................................... N. pseduozadolicha Strikis

34(31’). Filament of the aedeagus with 4 lines of spicula in the 4/5 from the base ............. N. spiculata sp. nov.

34’. Filament of the aedeagus smooth.....................................................................................................35

35(34). Filament of the aedeagus with different width along its length ........................................................36

35’. Filament of the aedeagus with equal width along its length .............................................................37

36(35). Aedeagus slender after C-shape and become large abruptly............................... N. cornuphallus Strikis

36’. C-shape and the base of the filament of the aedeagus equal width .................. N. turgidiphallus Strikis

37(35’). Apex of the filament distally strongly swollen ..................................................................................38

37’. Apex of the filament not strongly swollen........................................................................................39

38(37). Apex of the filament of the aedeagus strongly swollen (more than two times) and not clearly S-shape, filament just reaching the base of the cerci........................................................... N. pendula (Bezzi)

38’. Apex of the filament of the aedeagus swollen, but less than 2 times, and reaching the base of the cerci ................................................................................ N. pseudopendula (Korytkowski & Ojeda)

39(37’). Surstylus with 8 transversal and distal prensisetae at each side, gonopodite tubular-shape.................... ....................................................................................................... N. perezi (Romero S. & Ruppel)

39’. Surstylus with 9 longitudinal prensisetae at each side, 2 located near midline and 7 laterally located, gonopodite medially wider .................................................................................. N. angusta sp. nov.