Delia
Creators: name: Ackland, D. M.
Publisher: name: Zenodo
Year: 2008
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Diptera
Anthomyiidae
Delia

description: Key to Afrotropical species of Delia (males)
1 Either sternite III or IV (Figs 39, 52, 58, 65, 80) with long tuft(s) of setae on posterior margin, that are either lying flat along the sternite, or erect and projecting ventrally at right angles to the sternite ............................................................. 2
– Sternites with only normal dispersed setae or setulae that may be short or moderately long................................................................................................ 6
2(1) Sternite IV (Fig. 80) with a group of long setae on each posterior corner, that reach to apex of sternite V processes; sternite III with rather long but dispersed setae .................................................................................................. tibila sp. n.
– Sternite III with long setae on posterior margin, either on whole width of sternite, or grouped into 2 tufts on either side of hind margin; sternite IV wider than sternite III and clothed only with short sparse setulae ..................................... 3
3(2) Prealar seta absent. Sternite III (Fig. 39) with 2 tufts of setae on posterior margin, apices of which hardly reach posterior margin of sternite IV. Distal section of aedeagus with 2 long and slender paraphalli ................................. ismayi sp. n.
– Prealar seta present. Sternite III (Fig. 58) with either long setae on whole width, or setae on corners of posterior margin reaching past posterior margin of sternite IV (Fig. 52)....................................................................................................... 4
4(3) Scutum with very distinct wide dark vittae, the median vitta being as wide as distance between the dc rows, this vitta extends posteriorly over scutellum and continues as a narrow darker vitta on postnotum. Mid tarsomere 1 without lengthened dorsal setulae. Setae on posterior margin of sternite III long (Fig. 65), normally erect, but reaching posterior margin of sternite IV when pressed against sternites, the tips fine.Setae at apex of processes of sternite V(Fig.65) shorter than length of processes. Surstyli (Fig. 63) with apical third wide, inner margins apically less incised. Cercal plate with rounded apex.......................................................... steiniella (Emden)
– Scutum without, or with only indistinct darker vittae, if present median vitta narrow. Postnotum without a darker vitta. Surstyli (Fig. 56) with apical third narrow, inner margins apically more incised ................................................... 5
5(4) Setae on posterior margin of sternite III robust (Fig. 58), without fine curling tips, and not reaching much beyond posterior margin of sternite IV (when in an adpressed position), and median setae as long as or longer than lateral setae. Sternite V (Fig. 58) with apical setae on processes shorter than length of processes. Mid tarsomere 1 on dorsal surface with lengthened setulae (about as long as depth of metatarsus). Hind femur with 8–9 fine pv medially, about as long as depth of femur.Anterior costal spicules about 1.5× width of vein C, costal spine also strong ...................................................................... pseudoventralis sp. n.
– Setae on posterior margin of sternite III longer (Fig. 52) with fine curling tips that reach well beyond posterior margin of sternite IV, median setae finer and shorter than laterals, hence a tendency for setae to divide partially into two tufts. Mid tarsomere 1 with setulae on dorsal surface short and less distinct. Hind femur with only 2–3 pv distally.Anterior costal spicules shorter, not longer than width of C................................................................................ ventralis (Stein)
6(1) Prealar seta absent, or only represented by a fine hair ..................................... 7
– Prealar seta present, though sometimes short ................................................ 14
7(6) Mid tibia with 1–2 minute av ........................................................................... 8
– Mid tibia without av ....................................................................................... 11
8(7) Arista (Fig. 29) relatively long haired, total width of hairing equal to width of postpedicel, length of longest hairs (in proximal half) about 5× basal diameter of arista. Abdomen long and narrow, tergites almost parallel-sided. Vein C ventrally, with a row of more or less distinct setulae. Postpedicel nearly 2.5 times as long as wide ....................................................... arambourgi (Séguy)
– Arista short pubescent (Fig. 30), length of longest hairs at most twice basal diameter of arista.............................................................................................. 9
9(8) Hind femur (Fig. 27) with numerous (8–12) av (especially medially) which at least twice as long as greatest depth of femur, and which have fine curling tips directed apically; fine pv and hairs also numerous and long ..... urbana (Mall.)
– Hind femur with less numerous av, which do not have curling tips .............. 10
10(9) Gena wider, 0.28–0.30× eye height. Eye margins on frons separated by narrow black frontal stripe. Scutum with major setae arising from brown spots. Sternites III and IV wider (Fig. 3), sternite IV nearly as wide as long. Surstylus (Fig. 1) in caudal view narrower in apical half, in lateral view (Fig. 2) almost straight. Ground colour of body and legs blackish with grey dust ........ bracata (Rond.)
– Gena narrower, 0.17–0.20× eye height. Eye margins on frons practically touching. Scutum with major setae not arising from brown spots. Sternites III and IV (Fig. 33) much longer than wide, sternite IV more than twice as long as wide. Surstylus in caudal view wider in apical half, in lateral view curving downwards ........... ..................................................................................... madagascariensis sp. n.
11(7) Hind femur with 5–6 long av on whole length. Occipital setulae long, with numerous setulae forming a second row of setulae below upper row; genal setae biserial. Six pairs of presutural acr, which are quite long. Fore tibia without an apical pv. Hind tibia with 3 av. Dorsal surface of mid tarsomere 1 with some lengthened setulae, which are as long as depth of tarsomere and of equal length. Processes of sternite V (Fig. 74) with some long lateral setae with curling tips (longest as long as or longer than length of processes) ....... kigeziana (Emden)
– Hind femur with 3–4 av in distal half. Occipital setulae short, at most with only a few fine setulae below upper row; genal setae uniserial. Presutural acr short and fine. Fore tibia with a fine pointed apical pv. Hind tibia with 2 av. Mid tarsomere 1 on dorsal surface without any lengthened setulae. Processes of sternite V without long lateral curling setae. .............................................................. 12
12(11) Processes of sternite V not projecting downwards away from abdomen, and narrowing from base to apex. Fore tibia normally with 2 rather small pv, one beyond middle, other in distal quarter. Distal section of aedeagus without denticules (Fig. 15) ................................................................ flavibasis (Stein)
– Processes of sternite V projecting downwards, and dilated medially where they wider than at base. Fore tibia normally with only 1 strong pv beyond middle. Distal section of aedeagus with denticles ...................................................... 13
13(12) Distal section of aedeagus without distinct paraphalli (Fig. 88). Surstylus (Fig. 85) in caudal view slightly shorter, in lateral view less sinuate on anterior (ventral) margin ................................................................................... andersoni (Mall.)
– Distal section of aedeagus with long narrow paraphalli (Fig. 96) which extend beyond level of denticles. Surstyli (Fig. 91) in caudal view slightly longer and more slender, in lateral view (Fig. 92) more sinuate on anterior (ventral) margin .................................................................................................. endorsina sp. n.
14(6) Mid tarsomere 1 with a long dorsal fringe of curving setulae, the longest setulae longer than depth of tarsomere ....................................................................... 15
– Mid tarsomere 1 without a dorsal fringe of curving setulae, though (kigeziana) some longer dorsal setulae may be present which are not longer than depth of tarsomere ........................................................................................................ 17
15(14) Upper part of occiput bare below the row of rather short and fine upper occipital setulae. Wing base slightly suffused pale brownish; large crossvein almost straight. Scutum without distinct vittae or shining patches, pale grey dusted ... ................................................................................................... florilega (Zett.)
– Upper part of occiput with numerous setulae below the upper row of rather long but fine upper occipital setulae. Wing base strikingly dark brown suffused and contrasting with whitish squamae; large crossvein sinuate. Scutum with distinct blackish shifting vittae ................................................................................... 16
16(15) Surstylus (Fig. 120) in lateral view more or less straight and not significantly wider in basal half. Sternites III and IV (Fig. 121) wider than long (sternite IV 1.4× wider). Hind marginal setae (Fig. 122) on tergites IV and V shorter ........ ............................................................................................ metatarsata (Stein)
– Surstylus (Fig. 126) in lateral view bent downwards and wider in basal half, becoming slender and sinuate apically. Sternites III and IV (Fig. 127) longer than wide (sternite IV 0.9× wider). Hind marginal setae (Fig. 128) on tergites IV and V rather long ................................................................. cameroonica sp. n.
17(14) Fore tibia with a very short pointed pv apical seta. Costal spines distinctly longer than small crossvein.Abdomen long, slender, and parallel-sided, about 3.5 times longer than wide. Upper occipital row of setulae bi- to triserial. Hind tibia with only 3–4 pv. Processes of sternite V (Fig. 74) with about 8–10 long curling lateral setae, which are about 1.5× length of processes and more or less ventrally directed. No blunt spines on inner apical margins of processes (Fig. 74) ......... ............................................................................................. kigeziana (Emden)
– Fore tibia with a distinct blunt apical pv spur. Costal spines short, at most as long as small crossvein. Abdomen shorter, at most 2–2.5 times as long as wide. Upper occipital row of setulae uniserial, at most a few scattered hairs below row. Hind tibia with row of erect pv setulae (10–25). Processes of sternite V with either short lateral setae, or if longer then setae not curling .................. 18
18(17) Hind tibia with 10–16 pv erect or semi-erect short setulae and hairs between av, ad, pd, and pv rows (6–8 av, 4–5 a, 3–4 ad, 3–4 pd, 10–16 pv, with a few p setulae. Processes of sternite V without blunt spines (Fig. 105) ........................ .............................................................................................. bisciliata (Emden)
– Hind tibia with 20–25 short erect pv setulae, of more or less equal width, comblike; few accessory setulae between av, ad, pd, and pv (3–5 av, 6–8 ad, 3–4 pd, 20–25 pv). Processes of sternite V with 2 short blunt spines on each inner margin apically (Fig. 116) ....................................................................... platura (Mg.)
description: Published as part of Ackland, D. M., 2008, Revision of Afrotropical Delia Robineau-Desvoidy, 1830 (Diptera: Anthomyiidae), with descriptions of six new species, pp. 1-75 in African Invertebrates 49 (1) on pages 7-10, DOI: 10.5733/afin.049.0101, http://zenodo.org/record/7665342