Parathalassiinae, , Cumming & Brooks, 2019

Brooks, Scott E. & Cumming, Jeffrey M., 2022, New Australasian Parathalassiinae (Diptera: Dolichopodidae sensu lato), Zootaxa 5188 (6), pp. 521-543 : 541-542

Key to male Parathalassiinae in the Australasian Region

Ten species are currently known from the region, although additional species undoubtedly occur. Since a number of species are known only from males, female diagnostic features as they are understood, are summarized in the generic diagnoses above.

1 Wing with vein M 2 present; cell dm usually present ( Fig. 52 ), but sometimes cell dm and crossvein dm-m absent ( Shamshev & Grootaert 2005, fig. 12)................................................................................ 5

- Wing with vein M 2, cell dm and crossvein dm-m absent ( Fig. 22 )............................ Chimerothalassius … 2

2 Palpus elongate and gradually enlarged apically ( Figs 12, 14 ) ( New Zealand)..................................... 3

- Palpus abruptly capitate apically, narrow basally ( Figs 19 , 27, 28 ) ( New Caledonia)................................ 4

3 Head and thorax primarily silver-grey pruinose; mesonotal setae rather short and weak; legs pale yellowish; palpus largely yellow ( Fig. 12 ); genal setae weak and pale ( Fig. 12 ); hypopygium with phallus tip funnel-shaped ( Shamshev & Grootaert 2002, fig. 20)................................................................... C. ismayi Shamshev & Grootaert

- Head and thorax primarily dark brown-grey pruinose; mesonotal setae strong; legs brownish; palpus dark brown ( Figs 14, 15 ); genal setae strong and dark ( Fig. 14 ); hypopygium with phallus tip not expanded ( Fig. 16 ).......... C. marshalli sp. nov.

4 Palpus brown ( Fig. 19 ); antennal postpedicel with very short narrow tip ( Fig. 20 ); mesonotum with acrostichal setae absent and dorsocentral setae strong; hypopygium with enlarged hypoproct ( Figs 23–25 )...................... C. riparius sp. nov.

- Palpus white ( Figs 27, 28 ); antennal postpedicel with long narrow tip ( Fig. 27 ); mesonotum with acrostichal and dorsocentral setae short and weak; hypopygium with short hypoproct ( Fig. 33 )............................... C. sinclairi sp. nov.

5 Face narrow, about width of anterior ocellus; arista-like stylus lengthened, at least 5X as long as postpedicel (as in Fig. 35 ; Shamshev & Grootaert 2005, figs 1, 2)...................................................... Eothalassius … 6

- Face broad, about width of combined antennal bases or wider ( Fig. 41 ); arista-like stylus shorter, about 2X as long as postpedicel ( Figs 40 , 51 )....................................................................... Microphorella … 7

6 Wing with cell dm and crossvein dm-m present (as in Fig. 36 ; Shamshev & Grootaert 2005, fig. 25)............................................................................................ E. gracilis Shamshev & Grootaert

- Wing with cell dm and crossvein dm-m absent ( Shamshev & Grootaert 2005, fig. 12)..................................................................................................... E. platypalpus Shamshev & Grootaert

7 Body and legs with pale setation; head and thorax pale grey pollinose; palpus broadly clavate, flattened and pale (New Guinea).................................................................... M. papuana Shamshev & Grootaert

- Body and legs with black setation; head and thorax dark brownish or dark grey pollinose ( Figs 39–42 , 49–51 ); palpus narrowly ovate, dark brown ( Figs 40, 41 , 51 ) ( Australia)............................................................. 8

8 Hypopygium with phallus elongate, tightly curled ( Figs 53–55 )................................. M. viticula sp. nov.

- Hypopygium with phallus relatively short, not tightly curled ( Figs 43–45 , 47, 48 ).................................. 9

9 Hypopygium with phallus tip bent and brush-like ( Figs 47, 48 )..................................... M. iota Colless

- Hypopygium with phallus tip straight and tubular ( Figs 44, 45 )................................. M. bungle sp. nov.

Figures

FIGURES 49–55. Male holotype of Microphorella viticula sp. nov. 49. Habitus. 50. Head and thorax, dorsal view. 51. Head, lateral view. 52. Wing, ventral view. 53. Abdomen and terminalia, left lateral view. 54. Abdomen and terminalia, dorsal view. 55. Abdomen and terminalia, right lateral view.Abbreviations: dm—discal medial cell; dm-m—discal medial crossvein; M1, M2, M4—medial veins; ph—phallus; plp—palpus; R1, R2+3, R 4+5 —radial veins; v epand proc—ventral epandrial process.

FIGURES 19–22. Chimerothalassius riparius sp. nov. 19. Head of male holotype (CNC1155797), anterior view. 20. Head of male holotype, showing left antenna in medial view. 21. Abdomen of female paratype, lateral view. 22. Right wing of male holotype, dorsal view. Abbreviations: cerc—cercus; M1, M4—medial veins; plp—palpus; R1, R2+3, R 4+5 —radial veins; tg—tergite.

FIGURES 12–15. Chimerothalassius ismayi Shamshev & Grootaert and C. marshalli sp. nov. 12. Male of C. ismayi Shamshev & Grootaert from Port Levy, New Zealand (debu00102042), left lateral view. 13. Female of C. ismayi Shamshev & Grootaert from Cable Bay, New Zealand (USNM ENT 00085568), head and foreleg. 14. Male holotype of C. marshalli sp. nov., left lateral view of head and thorax. 15. Male holotype of C. marshalli sp. nov., dorsal view of head and thorax. Abbreviation: plp—palpus.

FIGURES 26–30. Male holotype of Chimerothalassius sinclairi sp. nov. (CNC1155798). 26. Habitus. 27. Head, lateral view. 28. Head, anterior view. 29. Abdomen and terminalia, dorsal view. 30. Abdomen and terminalia, right lateral view. Photos taken prior to removal, dissection and illustration of terminalia. Abbreviation: plp—palpus.

FIGURES 16–18. Hypopygium of Chimerothalassius marshalli sp. nov., holotype (debu00102042). 16. Hypopygium, left lateral view. 17. Hypopygium, right lateral view. 18. Cerci and hypoproct, dorsal view.Abbreviations: cerc—cercus; d sur—dorsal lobe of surstylus; epand—epandrium; hypd—hypandrium; hyprct—hypoproct; (L)—left; pgt lb—postgonite lobe; ph—phallus; (R)—right; v epand proc—ventral epandrial process; v sur—ventral lobe of surstylus.

FIGURES 23–25. Hypopygium of Chimerothalassius riparius sp. nov., holotype (CNC1155797). 23. Hypopygium, left lateral view. 24. Hypopygium, right lateral view. 25. Cerci and hypoproct, dorsal view. Abbreviations: cerc—cercus; d sur—dorsal lobe of surstylus; epand—epandrium; hypd—hypandrium; hyprct—hypoproct; (L)—left; pgt lb—postgonite lobe; ph—phallus; (R)—right; v epand proc—ventral epandrial process; v sur—ventral lobe of surstylus.

FIGURES 31–33. Hypopygium of Chimerothalassius sinclairi sp. nov., holotype (CNC1155798). 31. Hypopygium, left lateral view. 32. Hypopygium, right lateral view. 33. Cerci and hypoproct, dorsal view. Abbreviations: cerc—cercus; d sur—dorsal lobe of surstylus; epand—epandrium; hypd—hypandrium; hyprct—hypoproct; (L)—left; pgt lb—postgonite lobe; ph—phallus; (R)—right; v epand proc—ventral epandrial process; v sur—ventral lobe of surstylus.

FIGURES 34–38. Female of Eothalassius sp. from Plage de Poé, New Caledonia. 34. Habitus. 35. Head, oblique view. 36. Head and left wing. 37. Abdomen and terminalia, lateral view. 38. Abdomen and terminalia, dorsal view. Abbreviations: dm— discal medial cell; dm-m—discal medial crossvein; plp—palpus.

FIGURES 39–43. Male holotype of Microphorella bungle sp. nov. (CNC707570). 39. Habitus. 40. Head, oblique view. 41. Head, anterior view. 42. Thorax, dorsal view. 43. Abdomen and terminalia, right lateral view. Abbreviations: ph—phallus; plp—palpus.

FIGURES 47–48. Hypopygium of Microphorella iota Colless, paratype (ANIC Database No. 29 029402). 47. Hypopygium, left lateral view. 48. Hypopygium, right lateral view. Abbreviations: cerc—cercus; d sur—dorsal lobe of surstylus; epand— epandrium; hypd—hypandrium; (L)—left; pgt lb—postgonite lobe; ph—phallus; v epand proc—ventral epandrial process; v sur—ventral lobe of surstylus.

FIGURES 44–46. Hypopygium of Microphorella bungle sp. nov. (CNC707574). 44. Hypopygium, left lateral view. 45. Hypopygium, right lateral view. 46. Cerci and hypoproct, dorsal view. Abbreviations: cerc—cercus; d sur—dorsal lobe of surstylus; epand—epandrium; hypd—hypandrium; hyprct—hypoproct; pgt lb—postgonite lobe; ph—phallus; (R)—right; v epand proc—ventral epandrial process; v sur—ventral lobe of surstylus.