Subacuminiseta minor, Papp, László, 2014

Papp, László, 2014, New genera of Afrotropical limosinine sphaerocerids (Diptera: Sphaeroceridae), Zootaxa 3764 (2), pp. 101-130 : 129-130

Subacuminiseta minor sp. nov.

( Figs 107–118 )

Type material. Holotype male ( HNHM, body embedded in a good quality canada balsam preparation between two pieces of cover glass, abdomen and genitalia prepared and kept in a polyethylene microvial with glycerol): Ghana, Ho, air plankton, Abuadi-Kpeze, c. 50 km, 17:30–19:00, 15. 9. 1971, No. 475, leg. Endrődy-Y.[ounga].

Paratypes ( HNHM): 2 females (one of them in a good quality canada balsam preparation, head, abdomen and genitalia in a polyethylene microvial with glycerol): ibid., Volta region, N 6° 70' E 0° 03' - air plankton, 15 Nov 1971, No. 475, S. Endrődy-Younga.

Description. Measurements in mm: body length 1.10 (holotype), c. 1.12, 1.15 (paratypes); wing length not measurable on holotype, c. 0.98, 1.00 (paratypes); wing width not measurable on holotype, 0.47, 0.475 (paratypes). Body weakly sclerotised and not granulose.

Head broad, 0.26 mm, i.e. broader than thorax, but comparatively short. Facial plate much broader than high, large but flat swelling between antennae; antennal bases broadly distant (0.07 mm). Clypeus broad but only 0.025 mm high. Gena broad. Height of eye in profile (paratype female) 0.09 mm, genal width 0.085 mm. Vibrissa very long (0.10 mm) compared to the body length. No genal seta, longer peristomals on ventral margin of gena of 0.05 mm and 0.03 mm. 2 closely set short fronto-orbital setae. One long posterior and 1 very long (0.07–0.08 mm) anterior interfrontal setae. Ocellar seta not long (0.075 mm) but comparatively thick. Both inner and outer vertical setae strong, inner and outer occipital setae weak, postocellar indistinct. A definite row of pale preocular setulae present. Scape small, its medial seta only 0.03 mm. Pedicel with long setae in inner and dorsal apex only. First flagellomere with a distinct dorsal edge; apex with long cilia. Arista extremely long, c. 0.50 mm (paratype female).

Thorax with only 1 prescutellar dorsocentral seta. Apical scutellar seta 0.09 mm long. Anepisternum bare, 1 comparatively long (0.09 mm) katepisternal seta.

Legs with short and sparse setae. Trochanters without any setae. Claws and pulvilli normal, or rather, claws minute. Mid tibia without mid ventral seta, ventroapical seta comparatively strong. Mid tibial armature: anterodorsals at 9/26 (rather strong), 21/26 (strong), posterodorsal seta at 20/26. Mid basitarsus not particularly long, anteroventral and posteroventral rows of setulae even and normal. Hind tibia apical thornlet very short, only 0.015 mm. Hind basitarsus 0.06 mm long, second tarsomere 0.09 mm.

Wings. Costal vein much overruns apex of R4+5. Vein R4+5 strongly upcurved. Inter-crossvein section of M1+2 0.09 mm, M-M crossvein 0.075 mm, i.e. not much shorter. Both distal edges of discal cell larger than 90°, lower edge with a short appendage.

Abdomen. Preabdominal sclerites (except for male sternite 5) do not show any peculiarities. Male and female genitalia are described under the genus.

Etymology. The specific epithet of this new species refers to the Latin name ‘minor’ (small, noun).

Figures

FIGURES 107 – 112. Subacuminiseta minor sp. n., antenna, male postabdomen and genitalia. 107 = antenna, lateral view, 108 = sternite 5, ventral view, 109 = synsternite, ventral view, 110 = surstylus in broadest (subanterior-sublateral) view with right half of epandrium, 111 = subepandrial sclerite, inner (anterior) view, 112 = cerci, broadest (subcaudal) view. Scale bars: Fig. 107 = 0.2 mm, Figs 108 – 112 = 0.1 mm.

FIGURES 113 – 118. Subacuminiseta minor sp. n., male and female genitalia. 113 – 115 = holotype male: 113 = phallus and phallapodeme, left lateral view (basiphallus partly embraces distiphallus), 114 = distiphallus and phallapodeme with contour of distiphallus, dorsal view, 115 = right postgonite with right hypandrial arm slightly pushed into the plane of postgonite. 116 – 118 = paratype female: 116 = tergite 8, epiproct (very weakly sclerotised) and cerci, dorsal view, 117 = sternite 8 (!) and hypoproct, 118 = spermathecae. (S 8: sternite 8, T 8: tergite 8). Scale bar: Figs 113 – 118 = 0.1 mm.