Wiedemannia

Kustov, Semen & Zherebilo, Danil, 2015, New data on the genus Wiedemannia Zetterstedt (Diptera: Empididae) from the Caucasus with description of four new species, Zootaxa 4032 (4), pp. 351-369 : 367

Key to species of Wiedemannia from the Caucasus

1 Gena wide, more than 1/2 of eye height................................................................... 2

- Gena narrow, less than 1/3 of eye height.................................................................. 3

2 Pterostigma rounded, very large and distinct. Width of gena slightly more than 1/2 of eye height. Clasping cercus elongate, projecting well beyond tip of phallus, narrower at mid length and long slender basal process projecting anteriorly ( Fig. 2 )............................................................................. W. (Chamaedipsia) braueri (Mik)

- Pterostigma indistinct and elongate. Width of gena equal to eye height. Clasping cercus unilobed, shorter, extending to tip of phallus, broader at base, without basal process ( Fig. 3 )............................... W. (Philolutra) caucasica Joost

3 Acrostichal setae extending only to third dorsocentral seta.................................................... 4

- Acrostichal setae extending around prescutellar depression................................................... 8

4 Fore femur with strong anterior setae apically. Terminalia as in Figure 17 .............. W. (Eucelidia) zetterstedti (Fallén)

- Fore femur without strong anterior setae apically........................................................... 5

5 Notopleuron with blue pruinescence. Clasping cercus unilobed or with broad not slender lobes....................... 6

- Notopleuron without blue pruinescence. Clasping cercus with anterior lobe slender, digitiform....................... 7

6 Clasping cercus broad, mitten-shaped, lobes not slender ( Fig. 4 ).......................... W. (Philolutra) chvali Joost

- Clasping cercus long and unilobed, perpendicular to epandrium ( Fig. 14 ).............. W. shamshevi Kustov & Zherebilo

7 Lobes of clasping cercus orientated at right angles, L-shaped; digitiform lobe nearly directed vertically ( Fig. 7 )...................................................................................... W. (Philolutra) klausnitzeri Joost

- Lobes of clasping cercus more broadly orientated, beyond right angles ( Fig. 8 )............ W. kustovi Sinclair & Shamshev

8 Fore femur without strong anterior setae apically........................................................... 9

- Fore femur with strong anterior setae apically............................................................. 13

9 Clasping cercus undivided............................................................................ 10

- Clasping cercus bilobed.............................................................................. 11

10 Mesonotum with triangular-shaped blue pruinescence on prescutellar depression. Clasping cercus elongate, narrowed to apex ( Fig. 1 ).................................................................. W. (Chamaedipsia) beckeri (Mik)

- Mesonotum completely brownish. Clasping cercus rounded ( Fig. 15 )................... W. sinclairi Kustov & Zherebilo

11 Mesonotum with light greyish-blue pruinescence on notopleuron. Pleura with light blue pruinescence. Clasping cercus with shiny black anterior lobe ( Fig. 5 )............................................... W. (Philolutra) fallaciosa (Loew)

- Mesonotum completely brownish. Pleura with violet-blue pruinescence. Clasping cercus with dull anterior lobe........ 12

12 Clasping cercus with anterior lobe short, pointed, bearing cluster of apical setae; dorsal process subtriangular, inner margin clothed in dense setae ( Fig. 13 ).............................................. W. (Philolutra) pseudovaillanti Joost

- Clasping cercus with anterior lobe prolonged, digitiform and slender, without cluster of apical setae; dorsal process anvil- shaped, inner margin without dense setae ( Fig. 16 ).................................... W. (Philolutra) vaillanti Joost

13 Dorsocentrals without intermediate setae interspersed among primary setae...................................... 14

- Dorsocentrals with intermediate setae interspersed among primary setae........................................ 16

14 Fore femur with 1 strong anterior seta on apical third. Clasping cercus yellowish basally, long and wide, rounded apically ( Fig. 9 )......................................................................... W. (Chamaedipsia) lota Walker

- Fore femur with 2–3 strong anterior setae on apical third. Clasping cercus dorsally brown to black, narrowed apically... 15

15 Clasping cercus with apical finger-like prolongation ( Fig. 6 ).................................. W. ivkovicae sp. nov.

- Clasping cercus evenly narrowed apically ( Fig. 10 )........................................ W. nartshukae sp. nov.

16 Mesonotum with triangular-shaped blue pruinescence on prescutellar depression. Scutellum with only 2 long scutellar setae. Clasping cercus with broad apex ( Fig. 11 )................................................. W. ossetiana sp. nov.

- Mesonotum with light brown pruinescence on prescutellar depression. Scutellum with 2 long and 2–3 short marginal setae. Clasping cercus tapered apically, apex narrow ( Fig. 12 )..................................... W. pseguashae sp. nov.

Figures

FIGURES 1 – 6. Male terminalia of Wiedemannia, lateral view. 1, W. beckeri (Mik); 2, W. braueri (Mik); 3, W. caucasica Joost; 4, W. chvali Joost; 5, W. fallaciosa (Loew); 6, W. ivkovicae sp. nov. Scale bar = 0.1 mm. Abbreviations: cerc pl—cercal plate; cl cerc—clasping cercus, distph—distiphallus, epand—epandrium, hypd—hypandrium, ph—phallus.

FIGURES 12 – 17. Male terminalia of Wiedemannia, lateral view. 12, W. pseguashae sp. nov.; 13, W. pseudovaillanti Joost; 14, W. shamshevi Kustov & Zherebilo; 15, W. sinclairi Kustov & Zherebilo; 16, W. vaillanti Joost; 17, W. zetterstedti (Fallén). Scale bar = 0.1 mm.

FIGURES 7 – 11. Male terminalia of Wiedemannia, lateral view. 7, W. klausnitzeri Joost (from Joost 1981); 8, W. kustovi Sinclair & Shamshev (from Sinclair & Shamshev 2014); 9, W. lota Walker; 10, W. nartshukae sp. nov.; 11, W. ossetiana sp. nov. Scale bar = 0.1 mm. Abbreviations: sur—surstylus.