A review of the Silba admirabilis McAlpine species group (Diptera: Lonchaeidae) with descriptions of thirteen new species from the Afrotropical region Author Macgowan, Iain text Zootaxa 2015 4032 5 515 534 journal article 10.11646/zootaxa.4032.5.3 e028ebd3-b0ef-4416-b79b-e46bef00088a 1175-5326 232754 48AAF41A-27F9-48E0-9E01-CB588FDA5DBB Key to males of Silba admirabilis species group (all Afrotropical unless indicated) 1. Phallus boat-shaped, basal plate fused laterally to phallus, basiphallus spiculate ( Figs. 33–34 )....................................................................................................... chalkei McAlpine ; S.E. Asia. - Phallus with a distinct ventrally situated basal plate.......................................................... 2 2. Phallus with an additional pair of processes between it and the basal plate ( Figs. 29–30 )................................................................................................. admirabilis McAlpine ; India & Sri Lanka . - Phallus without such additional processes.................................................................. 3 3. Basiphallus with an obvious bulge on inner surface, in anterior view basal plate of phallus simple and lanceolate. (Figs. 35–36)......................................................................... flavitarsis MacGowan ; S.E. Asia. - Basiphallus without such a bulge or lanceolate basal plate..................................................... 4 4. In ventral view basal plate of phallus diamond shaped ( Figs. 16 & 18)............................................ 5 - In ventral view basal plate of phallus not diamond shaped...................................................... 6 5. Basal plate serrated apically and laterally, apical excavation a narrow V-shape ( Figs. 15–16 )................................................................................................................ lubumbashi sp. nov. - Basal plate without marginal serrations, apical excavation broader, U-shaped (Figs. 17–18)................ mbuti sp. nov. 6. In ventral view basal plate of phallus with apical margin only slightly concave, without a large V or U-shaped excavation (Figs. 8, 26, 38 &42).................................................................................. 7 - Basal plate of phallus at apex with an obvious V or U-shaped excavation........................................ 10 7. Basal plate long and very narrow, without any marginal serrations or spicules. (Fig. 8)................... bredoi sp. nov. - Basal plate wider, often with marginal serrations or spicules. ( Figs. 26 , 38 &42).................................. 8 8. Basal plate shorter than phallus, thin and translucent, with serrated margins, basiphallus broad and setulose (Figs. 37 & 38)................................................................................. hilli (Malloch) ; Australasia - Basal plate as long or longer than phallus. ( Figs. 26 –42)...................................................... 9 9. Apical margin of basal plate strongly serrated ( Fig. 26 ).......................................... upemba sp. nov. - Apical margin of basal plate almost smooth, with only a few spicules (Fig. 42).................... namibia MacGowan 10. In ventral view basal plate of phallus markedly swollen medially, apex with two diverging processes with between them an open U-shaped excavation (Fig 24)............................................................. tekei sp. nov. - In ventral view basal plate of phallus not markedly swollen medially........................................... 11 11. Basal plate of phallus bearing spicules across its ventral surface ( Figs 22 & 32 )................................... 12 - Basal plate of phallus without spicules across its ventral surface................................................ 13 12. Basal plate covered in large spicules, apically with a large open V-shaped excavation ( Figs. 31–32 ).... apodesma McAlpine - Basal plate bearing only small spicules, mostly along margins, apically with a U-shaped excavation ( Figs 21–22 )................................................................................................ spiculata sp. nov. 13. In ventral view basal plate of phallus narrow, with a spanner-shaped apex ( Figs. 9–10 )................. garamba sp. nov. - In ventral view basal plate of phallus usually broader, without such a spanner-shaped apex.......................... 14 14. In ventral view basal plate of phallus apically split for almost half of its length ( Figs. 20 & 28 )...................... 15 - In ventral view basal plate of phallus without such a deep split............................................... 16 15. Basal plate of phallus with two thin leaf-like parallel, gradually tapering, bluntly pointed apical lobes ( Figs. 27–28 )................................................................................................. wittei sp. nov. - Basal plate of phallus with parallel apical lobes constricted near apex, in lateral view with expanded apex. ( Figs. 19–20 )............................................................................................ saegeri sp. nov. 16. In ventral view basal plate of phallus with two square-ended apical processes separated by a V-shaped excavation. ( Figs. 39– 40 ).................................................................. israel MacGowan and Freidberg ; Israel . - Basal plate of phallus without square ended apical processes.................................................. 17 17. In lateral view basiphallus very broad and rounded ( Fig. 11 ). In ventral view basal plate widening at apex, forming two rather narrow, lateral apical processes separated by a wide apical excavation ( Fig. 12 )....................... hambai sp. nov. - In lateral view basiphallus not greatly broadened ( Figs. 3 , 5, 13 & 43).......................................... 18 18. In ventral view basal plate widening steadily from base to apex, apical processes almost parallel sided, apical excavation a rel- atively wide U-shape ( Figs. 3–4 )............................................................ bakongo sp. nov. - In ventral view basal plate broadest before the apex or straight sided (Figs. 6, 14 & 44)............................ 19 19. In ventral view basal plate parallel sided, apex with two pointed processes divided by a U-shaped excavation (Figs. 43–44)................................................................................... pappi Soós ; Afghanistan - In ventral view basal plate not parallel sided, broadest before the apex (Figs. 6 & 14).............................. 20 20. Basal plate broadened apically, in ventral view widest at apical third, apical processes slightly bulbous at apex, apical excavation a narrow mouthed U-shape, basiphallus not swollen. (Figs. 5–6)................................ boulangi sp. nov. - Basal plate thin and translucent, in ventral view at apical quarter before narrowing to apex with a V-shaped apical excavation, in ventral view basiphallus slightly swollen (Figs. 13–14)......................................... inimvua sp. nov.