Oligochaetosella inconspicua, Papp, László, 2014

Papp, László, 2014, New genera of Afrotropical limosinine sphaerocerids (Diptera: Sphaeroceridae), Zootaxa 3764 (2), pp. 101-130 : 118-119

Oligochaetosella inconspicua sp. nov.

( Figs 62–74 )

Type material. Holotype male ( HNHM, body with the head separated, in a good quality canada balsam preparation, abdomen with genitalia in a plastic microvial with glycerol): GHANA: Tamale, 25 km on Damongo road, air plankton—17:45–18:45, 18.08.1969, No. 390, S. Endrődy-Younga.

Paratypes ( HNHM): 1 male (abdomen with genitalia in a plastic microvial with glycerol) 1 female: same as for holotype; 1 male 1 female (male in canada balsam, abdomen with genitalia in a plastic microvial with glycerol): ibid., Tamale, light trap Osram HQL bungalow—12. 0 2. 1971, No. 456.

Description. Measurements in mm: body length 1.12 (holotype), 1.10–1.15 (paratypes); wing length 1.10 (holotype), 1.05–1.25 (paratypes); wing width 0.45 (holotype), 0.41–0.48 (paratypes). Head and all body brown.

Head 0.475 mm broad, antennae broadly separated by 0.06 mm. Facial plate concave but dorsally emerges into a large triangular carina (extended lunule between antennae). Oral margin protruding and upcurved. Eye strongly oblique, consequently gena extremely broadened posteriorly. Height of head 0.34 mm, postgena 0.225 mm, longest axis of eye 0.21 mm. 2 closely set fronto-orbitals: anterior pair emerges on the middle level of frons, several short discoloured fronto-orbitals, which continued in preocular setulae. 3 pairs of long interfrontal setae, plus a 4th posterior pair (or, it is long on the right side). Ocellars strong and strongly divergent. Inner vertical seta 2 times thicker than fronto-orbitals and 0.14 mm long; also outer vertical seta strong. Inner occipital seta white, 0.06–0.07 mm long, outer occipital seta thin. Postocellar seta not visible. No strong genal seta, i.e. longest seta on gena as long as peristomals, 0.035 mm. Vibrissa thick and 0.16 mm long. Arista long, c. 0.45 mm (!). Scape seta mediumlong (0.05 mm), longest pedicel seta 0.09 mm. First flagellomere with a broadly rounded dorsal apex. Aristal cilia sparse but 0.02 mm long.

Thorax. Mesonotal microchaetae rather sparse, pale but rather long. 1 posterior pair of dorsocentral setae of 0.165–0.17 mm. Only c. 4 acrostichal rows countable. Anepisternum bare, only 1 (posterior) katepisternal, only 0.11 mm long. Scutellum large broad, scutellars subequal: apical sc 0.24–0.25 mm, basal sc 0.19 mm. Apical scutellar seta emerges on small tubercle.

Legs brown, tarsi ochreous. Mid tibia with a 0.08 mm long ventroapical seta, but no mid ventral seta present. A distinct anterior apical seta on mid tibia. Mid tibial armature (tibial microchaetae sparse but 0.02–0.025 mm long): anterodorsals at 9/29, 21/29, a posterodorsal at 20/29. Mid basitarsus medium-long with 8 pairs of fine antero- and posteroventral setulae.

Wing similar to that of Subacuminiseta , but costa not thickened. Wing membrane light greyish yellow, veins pale yellow. Second costal section longer than third. No particularly long seta sub-basally on costa (max. 0.09 mm). Inter-crossvein section of M1+2 0.13 mm, M-M crossvein 0.07 mm. Discal cell distal edges c. 90°, lower edge with a distinct vein appendage of nearly 0.10 mm. Halter pale yellow.

Abdomen. The characters of male and female genitalia are described under the genus.

Etymology. The specific epithet (Latin: ‘inconspicuus’ = not remarkable) of this new species refers to the overall impression on the body, where one can find rather few remarkable features.

Figures

FIGURES 62 – 67. Oligochaetosella inconspicua sp. n., male postabdomen and genitalia. 62 = sternite 5, ventral view, 63 = medio-caudal part of sternite 5 in higher magnification, 64 = synsternite, ventral view, 65 = subepandrial sclerite, cerci and right surstylus, caudal view, 66 = surstylus, broadest (sublateral-subcaudal) view, 67 = phallus, phallapodeme and postgonite, left lateral view. (BPh: basiphallus, C: cercus, DPh: distiphallus, HA: hypandrium, iS 8: inner surface of sternite 8, PG: postgonite, sscl: subepandrial sclerite). Scale bars: Figs 62, 64 = 0.2 mm, Figs 63, 65 – 67 = 0.1 mm.

FIGURES 68 – 74. Oligochaetosella inconspicua sp. n., male and female postabdomen and genitalia. 68 – 69 = male paratype: 68 = male genitalia, caudal view, 69 = postgonite, lateral view. 70 – 74 = female paratype. 70 = tergite 8 with contours of epiproct, cercus, hypoproct and sternite 7 + 8 complex, lateral view, 71 = sternite 7 fused with sternite 8, broadest (i. e. subcaudal) view, 72 = hypoproct, ventral view, 73 = epiproct and cerci, subdorsal (epiproct broadest) view, 74 = spermathecae in glycerol. (C: cercus, EP: epandrium, hy: hypoproct, PG: postgonite, S 7 + 8: sternite 7 fused with sternite 8, sscl: subepandrial sclerite, T 8: tergite 8). Scale bar: Figs 68 – 74 = 0.1 mm.