Lonchaeidae

Macgowan, Iain, 2014, The Lonchaeidae of Fiji (Diptera: Schizophora), Zootaxa 3814 (4), pp. 537-552 : 551-552

Key to the genera and species of Lonchaeidae present in Fiji

Determination of Lamprolonchaea , Lonchaea and Silba at species level can only be done at present for male specimens.

1. A single poststigmatal seta present on the anterior marginal portion of anepisternum above and slightly posterior to the anterior thoracic spiracle, frons with lateral corrugations on anterior half, a strong anterior setae present on the genae, lunule with setulae, basal tarsomeres pale......................................................... Dasiops ruidifrons

- poststigmatal seta absent, frons without lateral corrugations, strong anterior genal seta absent......................... 2

2. Lunule with setulae................................................................................... 3

- Lunule without setulae.................................................................. 4 Lamprolonchaea

3. Males - inner surface of surstyli with only setulae or setae ( Fig. 12 ). Katepisternum with one strong dorsocentral seta..................................................................................................6. Lonchaea

- Males - inner surface of surstyli with an obvious row of prensisetae (teeth) ( Fig. 30 ) Katepisternum with two strong dorsocen- tral setae....................................................................................... 9. Silba

4. Males - inner surface of surstyli evenly covered in fine setulae ( Figs 5 & 8 )...................................... 5

- Males - inner surface of surstyli with at most with a few setulae ( Fig. 2 ). Phallus a slender curved U-shape with obvious apical knob ( Fig. 3 ).................................................................... Lamprolonchaea gilvipata

5. Surstyli almost square in shape, usually with only 4 or 5 well separated long setulae along outer margin. ( Fig. 5 ). Phallus stout with an asymmetrical dilated apex ( Fig. 6 )............................................. Lamprolonchaea lustrata

- Surstyli with an obvious anterior lobe, always more than 4 or 5 long setulae along outer margin. ( Fig. 8 ). Phallus long and slen- der forming a rather rectangular U-shape, basal section often with denticles, apex narrow ( Fig. 9 )................................................................................................... Lamprolonchaea metatarsata

6. Phallus with a short apical section, ( Figs. 16 & 20 )........................................................... 7

- Phallus with apical section long and slender ( Figs. 13 & 23 ).................................................. 8

7. In lateral view apical section of phallus shield-shaped ( Fig. 20 ), apex of basal section simple, without spicules............................................................................................... Lonchaea melanesia

- In lateral view apical section of phallus tubular ( Fig. 16 ), apex of basal section bifurcated and bearing spicules ( Fig. 17 )........................................................................................ Lonchaea linefacies

8. Cerci bearing thick, blade-like setae at base ( Fig. 10 ).............................................. Lonchaea fiji

- Surstyli with a single row of long strong setulae ( Fig. 22 ). Phallus a rectangular L-shape, weakly segmented ( Fig. 23 ).......

....................................................................................... Lonchaea vanua 9. Phallus long, thin and curving with a characteristic angled tip ( Fig 28 )................................. Silba perplexa

- Phallus stouter with a basal process ( Figs. 26 & 31 )......................................................... 10

10. Phallus largely covered in small setulae, basal process simple ( Figs. 31 & 32 ), calypteres greyish with dark fringe................................................................................................ Silba setiphallus

- Phallus with only a few setulae, basal process bifurcate at apex ( Figs. 26 & 27 ), calypteres and fringe white........................................................................................................ Silba kadavu

Figures

FIGURE 28. Silba perplexa. Epandrium and associated structures lateral view.

FIGURES 10 – 13. Lonchaea fiji sp. nov. 10. Epandrium and associated structures lateral view. 11. Same ventral view. 12. Inner surface of surstyli, 13. Phallus lateral view.

FIGURES 29 – 32. Silba setiphallus sp. nov. 29. Epandrium and associated structures lateral view. 30. Same ventral view. 31. Phallus lateral view. 32. Phallus ventral view.

FIGURES 4 – 6. Lamprolonchaea lustrata McAlpine. 4. Epandrium and associated structures lateral view. 5. Internal view of surstylus. 6. Phallus lateral view.

FIGURES 7 – 9. Lamprolonchaea metatarsata Kertész. 7. Epandrium and associated structures lateral view. 8. Internal view of surstylus. 9. Phallus lateral view.

FIGURES 1 – 3. Lamprolonchaea gilvipata McAlpine. 1. Epandrium and associated structures lateral view. 2. Internal view of surstylus. 3. Phallus lateral view.

FIGURES 14 – 17. Lonchaea linefacies McAlpine, 14. Epandrium and associated structures lateral view. 15. Internal view of surstylus. 16. Phallus lateral view, 17. Apex of phallus ventral view.

FIGURES 18 – 20. Lonchaea melanesia 18. Epandrium and associated structures lateral view. 19. Internal view of surstylus. 20. Phallus lateral view.

FIGURES 21 – 23. Lonchaea vanua sp. nov. 21. Epandrium and associated structures lateral view. 22. Internal view of surstylus. 23. Phallus lateral view.

FIGURES 24 – 27. Silba kadavu sp. nov. 24. Epandrium and associated structures lateral view. 25. Same ventral view. 26. Phallus lateral view. 27. Phallus ventral view.