Thrypticus, Gerstacker

Negrobov, Oleg P. & Naglis, Stefan, 2020, Two new species of Thrypticus Gerstäcker from Turkey (Diptera, Dolichopodidae) with checklist and key to Palaearctic species, Zootaxa 4858 (1), pp. 111-125 : 120-123

Key to males of Palaearctic species of Thrypticus

Thrypticus riparius Negrobov, 1971 was described based on a female, but has been tentatively included in the key based on the known female characters. Thrypticus pruinosus Parent is included in the key in the sense of Negrobov & Stackelberg (1971) but the species probably represents a different species.

1 Scutellum with 6–8 strong marginal setae; hypandrium without swelling or notch; surstylus with numerous strong setae; hypopygium Fig. 6A ................................................................... smaragdinus Gerstäcker

- Scutellum with 2 strong marginal setae, sometimes with 2 additional small lateral setae; surstylus not as above; hypandrium usually with swelling or notch........................................................................... 2

2 Scutellum with 2 small lateral setae in addition to the strong marginal setae; tibiae usually yellow..................... 3

- Scutellum without small lateral setae in addition to the strong marginal setae; tibiae usually dark (tibiae yellowish in T. politus , T. riparius and T. virescens )............................................................................ 12

3 Femora mainly yellow................................................................................. 4

- Femora mainly dark................................................................................... 7

4 At least antennal scape yellow........................................................................... 5

- Antenna entirely black................................................................................. 6

5 Antennal scape yellow, pedicel partly brown; cercus as long as surstylus, without projection; surstylus curved, pyriform, without apicodorsal notch; hypopygium Fig. 5 ........................................................ viridis Parent

- Antennal scape and pedicel yellow; cercus longer than surstylus, with slender projection; surstylus straight, parallel-sided, with apicodorsal notch; hypopygium Figs 4A, B, C .................................................. kechevi sp. nov.

6 Surstylus straight, with 6 setae and hairs at apex; hypopygium Fig. 6C .................................. atomus Frey

- Surstylus curved, with more than 40 setae and hairs; hypopygium Fig. 6D . mongoliensis Negrobov, Selivanova & Maslova

7 Antennal scape and pedicel yellow; hypopygium Fig. 6E ........................... aphroditus Negrobov & Tsurikov

- Antennal segments entirely dark......................................................................... 8

8 Surstylus entirely yellow; surstylus slender and parallel-sided; hypopygium Fig. 6F ................... incanus Negrobov

- Surstylus with black apex............................................................................... 9

9 Apical setae of epandrial lobes on almost same level; surstylus apically pointed; hypopygium Fig. 7A .... pollinosus Verrall

- Apical setae of epandrial lobes on different levels; surstylus apically rounded..................................... 10

10 Surstylus apically pointed in ventral view, with small teeth; hypopygium Fig. 7B ..................... vestitus Negrobov

- Surstylus apically rounded in ventral view, without small teeth................................................ 11

11 Femora entirely metallic green, surstylus mainly black; phallus apicoventrally with triangular projection; hypopygium Fig. 7C ................................................................................ intercedens Negrobov

- Femora metallic green and apical ¼ yellow; surstylus only black in apical part; phallus apicoventrally with finger-like projection; hypopygium Fig. 7D .............................................................. paludicola Negrobov

12. Tip of arista white; legs entirely yellow; basal antennal segments yellow (male unknown).............. riparius Negrobov

- Arista entirely black; legs partly dark; antennal segments usually black.......................................... 13

13 Fore tibia ventrally with thin apical seta, longer than diameter of tibia; fore basitarsus with 1 ventral and 1 pv apical seta, twice as long as diameter of tarsomere; legs black, knees dark brown; surstylus and cercus black; hypopygium Fig. 7E ............................................................................................... emiliae Negrobov

- Fore tibia and tarsomeres lacking setae as above; knees usually yellow (except T. cuneatus and T. nigricauda )........... 14

14 Mid tibia without ad seta at basal third................................................................... 15

- Mid tibia with ad seta at basal third...................................................................... 17

15 Wing shape cuneiform, R 4 +5 and M diverging, basal section of CuA longer than distal section ( Fig. 9F ); hypopygium Fig. 7F ....................................................................................... cuneatus Becker

- Wing shape ovate, R 4+5 and M parallel; basal section of CuA shorter than distal section............................. 16

16 Thorax and abdomen shiny metallic green; surstylus and cercus black; surstylus at middle three times as broad as basally; hypopygium Fig. 8A ........................................................................ nigricauda Wood

- Thorax and abdomen shiny metallic blue violet; surstylus and cercus yellow; surstylus at middle as broad as basally; hypopygium Figs 2A, B, C ...................................................................... caeruleus sp. nov.

17 Arista pubescent, almost uniformly thiсkened throughout its length; clypeus about as high as broad; surstylus slender, apically broadened, with several apical protrusions; hypopygium Fig. 8B ...................................... divisus Strobl

- Arista almost bare, thin; clypeus considerably higher than broad............................................... 18

18 Veins R 4+5 and M distally diverging; surstylus apically with pointed protrusion; hypopygium Fig. 8C ......... laetus Verrall

- Veins R 4+5 and M distally parallel........................................................................ 19

19 Surstylus and cercus mainly dark; ventral margin of surstylus almost straight..................................... 20

- Surstylus and cercus mainly yellow; ventral margin of surstylus distinctly bowed.................................. 21

20 Surstylus apicolaterally curved in almost right angle in ventral view; hyopygium Fig. 8D .............. altaicus Negrobov

- Surstylus apicolaterally rounded in ventral view; hypopygium Fig. 8E ............................ virescens Negrobov

21 Surstylus more than twice as long as wide in ventral view.................................................... 22

- Surstylus at most twice as long as wide in ventral view...................................................... 24

22 Surstylus apically with strong U-shaped excavation; cercus with slender apical projection; hypopygium Fig. 8F ................................................................................................. politus Negrobov

- Surstylus apically without strong U-shaped excavation....................................................... 23 23 Surstylus with lateral margin parallel in ventral view; inner and outer setae of epandrial lobes crossing each other in ventral view; hypopygium Fig. 9A ................................................................ subtilis Negrobov

- Surstylus with lateral margin curved in ventral view; inner and outer setae of epandrial lobes divergent in ventral view hypopygium Fig. 9B .............................................................................. tarsalis Parent

24 Cercus with apical prolongation 4 times as long as high; hypopygium Fig. 9C ........................................................................................... pruinosus Parent sensu Negrobov & Stackelberg (1971)

- Cercus with apical prolongation at most 2.5 times as long as high.............................................. 25

25 Surstylus strongly broadened in apical third; surstylus outside margin strongly rounded in ventral view; hypopygium Fig. 9D .......................................................................................... bellus Loew

- Surstylus parallel-sided in apical third; surstylus outside margin parallel–sided in ventral view; hypopygium Fig. 9E .............................................................................................. tsacasi Negrobov

Figures

FIGURE 2. Thrypticus caeruleus Naglis & Negrobov, sp. nov. A, hypopygium, left lateral; B, hypopygium, ventral; C, hypopygium apical part, left lateral. Cer = Cercus; El = Epandrial lobes; Hyp = Hypandrium; Ph = Phallus; Sur = Surstylus. (Scale bar = 0.1 mm).

FIGURE 4. Thrypticus kechevi Naglis & Negrobov, sp. nov. A, hypopygium apical part, left lateral; B, hypopygium, left lateral; C, hypopygium, ventral. (Scale bar = 0.1 mm).

FIGURE 5. Thrypticus viridis Parent holotype, hypopygium apical part, left lateral. (Scale bar = 0.1 mm).

FIGURE 6. Thrypticus species, hypopygia left lateral. A, T. smaragdinus Gerstäcker; B, T. viridis Parent; C, T. atomus Frey; D, T. mongoliensis Negrobov, Selivanova & Maslova; E, T. aphroditus Negrobov & Tsurikov; F, T. incanus Negrobov. (Figs A-C, F from Negrobov & Stackelberg (1971–77); Fig. D from Negrobov et al. (2019); Fig. E from Negrobov & Tsurikov (1986)).

FIGURE 7. Thrypticus species, hypopygia; A, C, D, E F: left lateral; B: ventral. A, T. pollinosus Verrall; B, T. vestitus Negrobov; C, T. intercedens Negrobov; D, T. paludicola Negrobov; E, T. emiliae Negrobov; F, T. cuneatus Becker. (Figs from Negrobov & Stackelberg (1971–77)).

FIGURE 8. Thrypticus species, hypopygia left lateral. A, T. nigricauda Wood; B, T. divisus Strobl; C, T. laetus Verrall; D, T. altaicus Negrobov; E, T. virescens Negrobov; F, T. politus Negrobov. (Figs from Negrobov & Stackelberg (1971–77)).

FIGURE 9. Thrypticus species, A–E: hypopygia, left lateral; F: wing. A, T. subtilis Negrobov; B, T. tarsalis Parent; C, T. pruinosus Parent sensu Negrobov & Stackelberg; D, T. bellus Loew; E, T. tsacasi Negrobov; F, T. cuneatus Becker. (Figs from Negrobov & Stackelberg (1971–77)).