New species of Hercostomus Loew, 1857 from Afrotropics (Diptera: Dolichopodidae) and key to Afrotropical fauna Grichanov, Igor Ya. European Journal of Taxonomy 2020 2020-10-22 722 16 36 8GV6B Grichanov, 2020 Grichanov 2020 [595,894,1666,1693] Insecta Dolichopodidae Hercostomus GBIF Animalia Diptera 9 25 Arthropoda species koshelevae sp. nov.   Fig. 4    Diagnosis The new species is sister species to  H. sanipass sp. nov., differing distinctly in its smaller size, narrower face, lighter colored legs, weakly widened fore tarsomere 3. The hypopygia are rather similar in the two species. Nevertheless, the proximal arm at apex of ventral lobe of postgonite in  H. koshelevae sp. nov.is always thinner than that in  H. sanipass. The long basolateral cercal lobe in males of both species is very peculiar, being much shorter in males of close species with modified fore tarsus.    Etymology The species is named for the Russian entomologist, Dr. Oksana Kosheleva (VIZR, St. Petersburg).    Material examined    Holotype  SOUTH AFRICA• ♂; KwaZulu-Natal, Balgowan, “Yellowoods”; 29°24′′ S, 30°03′′ E;  1300 ma.s.l.;  31 Dec. 1982; J. Manningleg.; high forest, deeply shaded stream herbs; NMSA.   Paratypes   SOUTH AFRICA–  KwaZulu-Natal• 4 ♂♂, 1 ♀; same data as for the holotype•  1 ♂; Pietermaritzburg, Town Bush, 2930Cb;  Nov. 1971; M.E. Irwinleg.; terminalia dissected and stored in glycerin in microvials pinned with the specimen; NMSA•  1 ♀; Richmond District, Pateni, 2930Cc; 30°09′′ S, 29°56′′ E;  18 Nov. 1971; B. and P. Stuckenbergleg.; temp. forest; NMSA•  1 ♂; Deepdale, Umkomaas Valley; 29°48′ S, 29°58′ E;  May 1959; B. and P. Stuckenbergleg.; terminalia dissected and stored in glycerin in microvials pinned with the specimen; NMSA•  1 ♂, 1 ♀; Royal Natal National Park, Forest stream rocks;  1828.8 ma.s.l.[alt. 6000’];  19 Jan. 1987; J. Manningleg.; terminalia dissected and stored in glycerin in microvials pinned with the specimen; NMSA•  1 ♂; Cathedral Peak Natural Reserve, Rainbow Gorge;  1480 ma.s.l.; 28°57.6′ S, 29°13.61′ E;  29 May – 21 Sep. 2006; Mostovskileg.; malaise trap; NMSA. –   Eastern Cape• 1 ♂, 1 ♀; Storms River Pass, Tsitsikama Range; 33°59′ S, 23°55′ E;  12–13 Oct. 1959; B. and P. Stuckenbergleg; indigenous forest; terminalia dissected and stored in glycerin in microvials pinned with the specimen; NMSA•  1 ♀; Hogsback, 3226Db; 32°35′ S, 26°57′ E;  13–16 Dec. 1985; J. and B. Londtleg.; forest and forest margins; NMSA. –   Western Cape• 1 ♂; Groeneweide Forest, Saasweld Forest margin; 33°57′ S, 22°32′ E; ca  150 ma.s.l.;  9 Sep. 1993; D. and C. Barracloughleg.; terminalia dissected and stored in glycerin in microvials pinned with the specimen; NMSA. –   Mpumalanga• 1 ♂; E. Transvaal, Marieskop[Forest Reserve];  Oct. 1956; B. Stuckenbergleg.; terminalia dissected and stored in glycerin in microvials pinned with the specimen; NMSA.    Description  Male( Fig. 4) Similar to  H. sanipass sp. nov.in all respects except as noted. MEASUREMENTS (in mm). Body length 3.6–4.1; antenna length 1; wing length 3.9; wing width 1.4 ( Fig. 4A). HEAD. Face gradually narrowed towards palpi, 4.9 × as high as wide in middle, under antennae 1.5 × as wide as width of postpedicel, at clypeus half as wide as width of postpedicel. Antennal postpedicel 1.3 × longer than high ( Fig. 4B). Length ratio of scape to pedicel to postpedicel to stylus (1 st– 2 ndsegments), 23/10/23/15/50. Palpus, proboscis moderately small, yellow, with short black setae; palpus with 1 black bristle. THORAX. Mostly greenish-black, greyish pollinose; metepimeron dirty yellow. LEGS. including coxae mostly light yellow; mid coxa brownish laterally; hind femur brownish at extreme apex; tarsi black from tip of basitarsus, fore tarsomere 5 yellow. Fore tarsomere 3 flattened and slightly widened, with dorsal comb of short black setulae; tarsomeres 4–5 with semi-accumbent dorsal hairs, tarsomere 4 with black hairs, tarsomere 5 with white hairs ( Fig. 4C). Length of fore femur, tibia and tarsomeres 1–5 = 1.15 mm, 1.29 mm, 0.65 mm, 0.53 mm, 0.33 mm, 0.14 mm, 0.16 mm. Length of mid femur, tibia and tarsomeres 1–5 = 1.38 mm, 1.8 mm, 1.01 mm, 0.49 mm, 0.4 mm, 0.22 mm, 0.16 mm. Length of hind femur, tibia and tarsomeres 1–5 = 1.75 mm, 2.16 mm, 0.58 mm, 0.74 mm, 0.5 mm, 0.26 mm, 0.2 mm. WINGS. simple, greyish, almost hyaline, veins brown. Ratio of part of costa between R 2+3and R 4+5to between R 4+5and M 1+2, 24/7. Ratio of dm-m to distal part of M 4, 39/60. GENITALIA. ( Fig. 4D) with epandrium mostly yellow, brown at base. Hypandrium mid-ventral, with short base, 4 long thin lobes of different lengths, widths. Phallus thin, projected. Distoventral epandrial lobe as short rounded prominence, fused to epandrium, with 1 short and 1 long seta. Surstylus yellow, bilobate; ventral lobe broad, simple, ¾ length of dorsal lobe, with 1 subapical seta; dorsal lobe of surstylus widened in distal half, with short narrow process at apex, several subapical setulae, 1 strong mid-dorsal seta. Distal lobe of postgonite as long as ventral lobe of surstylus, narrow, broad and pointed at apex. Ventral lobe of postgonite ( Fig. 4E) strongly sclerotized, with 2 long arms (anterior, posterior) at apex forming letter V, 2 short symmetrical processes between them, covered with denticles on ventral side. Cercus ( Fig. 4F) broad, light yellow, densely covered with short light hairs, longer at apex; cercus with basolateral lobe, longer than cercus, densely covered with long setae, with distolateral narrow process bearing 3 thick hook-tipped setae at apex; 2 strong setae proximal to process, 3 strong setae at apex of cercus.   Fig. 4.  Hercostomus koshelevae sp. nov., ♂, holotype (MNSA; A–C); ♂, paratype, Town Bush (MNSA; D–F). A. Habitus. B. Antenna. C. Fore tarsus. D. Hypopygium, right lateral view. E. Distoventral appendages of epandrium. F. Cercus.  Female Similar to male except lacking male secondary sexual characters.    Ecology According to typespecimen labels, imagos inhabit rocks in mountain streams, being common in forests.    Distribution  South Africa. 2898013314 high forest, deeply shaded stream herbs 1982-12-31 NMSA J. Manning South Africa 1300 Balgowan 10 26 1 KwaZulu-Natal holotype 2898013305 [189,1116,596,622] high forest, deeply shaded stream herbs 1982-12-31 NMSA J. Manning South Africa 1300 KwaZulu-Natal 10 26 5 1 4 KwaZulu-Natal paratype 2898013324 1971-11 NMSA M. E. Irwin South Africa Pietermaritzburg Town Bush Town Bush 10 26 1 1 KwaZulu-Natal paratype 2898013320 temp. forest 1971-11-18 NMSA B. and P. Stuckenberg South Africa Richmond District Pateni Pateni 10 26 1 1 KwaZulu-Natal paratype 2898013316 1959-05 NMSA B. and P. Stuckenberg South Africa -29.8 Umkomaas Valley 1225 29.966667 Deepdale 10 26 1 1 KwaZulu-Natal paratype 2898013322 1987-01-19 NMSA J. Manning South Africa 1829 Forest stream rocks Royal Natal National Park 10 26 2 1 1 KwaZulu-Natal paratype 2898013323 2006-05-29 2006-09-21 2006-05-29 malaise trap NMSA Mostovski South Africa 1480 -28.96 Rainbow Gorge 92 29.226833 Cathedral Peak Natural Reserve 10 26 1 1 KwaZulu-Natal paratype 2898013308 1959-10-12 1959-10-13 1959-10-12 NMSA B. and P. Stuckenberg South Africa -33.983334 Storms River Pass 1202 23.916666 River Pass 10 26 2 1 1 Eastern Cape paratype 2898013321 forest and forest margins 1985-12-13 1985-12-16 1985-12-13 NMSA J. and B. Londt South Africa -32.583332 Hogsback 1209 26.95 Hogsback 10 26 1 1 Eastern Cape paratype 2898013310 1993-09-09 NMSA D. and C. Barraclough South Africa 150 -33.95 Saasweld Forest margin 1202 22.533333 Groeneweide Forest 10 26 1 1 Western Cape paratype 2898013328 1956-10 NMSA B. Stuckenberg South Africa E. Transvaal 10 26 1 1 Mpumalanga paratype