Mycomyiella ghanaensis, Gammelmo, Øivind, 2004

Gammelmo, Øivind, 2004, A review of the Afrotropical genus Mycomyiella Matile, 1973 (Diptera, Mycetophilidae, Mycomyini), with the description of six new species, Zootaxa 625, pp. 1-30 : 19-22

Mycomyiella ghanaensis new species

( Figs 11–14 )

Type material: Holotype male, GHANA: Eastern Region, Subri stream, North of Kibi, 6.xi.1993, NUFU­project ( ZMUN). Paratypes: 3 males, as holotype; 1 male, Volta Region, Agumatsa waterfalls, Wli, 4–14.iii.1993, NUFU­project ( ZMUN); 3 males, Volta Region, Agumatsa waterfalls, Wli, 11–20.xi.1993, NUFU­project ( ZMUN); 7 males, Central Region, Kakum, 31.x.–8.xi.1994, NUFU­project ( ZMUN); 2 males, Central Region, Kakum, 8–15.xi.1994, NUFU­project ( ZMUN); 2 males, Western Region, Ankasa game production Reserve, 31.iii.1993, NUFU­project ( ZMUN).

Etymology: Named after the country of origin.

Diagnostic characters: The male groups with M. camerounensis Matile and M. securiculata Matile in having a simple gonostylus with thickened base. It can be separated from M. camerounensis in having the lobes of tergite 9 evenly setose, and from M. securiculata in having a comparatively short gonostylus. The species is smaller, and has a slightly darker appearance than other species in the genus.

Description

Male (n=19). Total length 1.87–2.56, 2.31 mm.

Coloration: Head light brown. Palpomeres and other mouthparts brown. Ocellar area dark brown. Face light brown to yellow, posterior parts of head brown. Antennae yellowbrown; scape, pedicel and base of first flagellomere yellow. Antepronotum yellow. Scutum brown to dark brown, with 3 brown longitudinal bands. Anepisternum and preepisternum yellow­ brown. Scutellum light brown to brown. Laterotergite and mediotergite yellowbrown. Coxae light brown, femura light brown to brown, tibiae and tarsi light brown. Tergite 1 brown; tergite 2 yellow; tergite 3 brown; tergite 4 yellow with brown, median band; tergites 5–7 brown. Sternites 1–4 yellow, sternites 5–6 brown, sternite 7 light brown. Terminalia light brown to brown.

Head: Head 0.44–0.48, 0.45 mm long; 0.43–0.58, 0.47 mm wide. First flagellomere 1.5–2.0 times as long as wide; second flagellomere as long as wide. Clypeus 0.07–0.09, 0.08 mm long; with lateral setae. Ocellar area 0.08–0.09, 0.08 mm wide; placed above upper margin of compound eye. Some setae in front of ocellar area. Posterolateral portion of frons densely setose; setae reaching just below ocellar area. Face bare. Mouthparts short. Palpomere 4 with 3–5 setae subbasally; palpomere 3 with 2–3 setae subbasally and 2–3 setae dorsomedially. Palpomere ratios (2–5) as: 1.00: 3.00: 3.00: 4.67.

Thorax: Total length 0.86–0.94, 0.90 mm. Scutum 0.77–0.86, 0.82 mm long; scutellum 0.08–0.09, 0.09 mm long.

Legs: Leg measurements and ratios as in Tables 4 & 5.

Wings: Wing 2.11–2.38, 2.22 mm long; 0.84–0.94, 0.88 mm wide. Sc1 lacking. Sc ending in R1 slightly distal to middle of small cell. Sc with 7–12, 9 macrotrichia apically. R4/Rs­cell 1.0–2.0 times as long as wide. CuA fork slightly distal to M fork. Wing measurements are given in Table 6 .

Abdomen: Length of abdomen 0.97–1.54, 1.26 mm; tergite 5 0.44–0.67, 0.60 mm wide.

Male terminalia ( Figs 11–14 ). Tergite 8 wide, with 4–6, 6 setae posterolaterally. Tergite 9 with long, tapering, setose lobes; with rounded basolateral corners, with 3–6, setae; with row of short setae medially. Gonocoxite bare laterally; with reduced lobes; with short, rounded, setose lateral prolongations. Gonostylus simple, with prominent base. Aedeagus large, covered with short setae and with long setae subapically. Sternite 8 long, rounded apically, densely setose in apical one­half.

Female (n=13). Total length 2.23–2.76, 2.56 mm. As for males, except:

Coloration: Mediotergite yellow with brown patches medially. Laterotergite yellow. Tergite 3 yellow with brown bands along all margins. Tergite 7 brown. Sternite 7 yellow.

Head: Palpomere ratios (2–5) as: 1.00: 2.76: 2.89: 5.06.

Thorax: Total length 0.89–1.12,1.07 mm. Scutum 0.83–0.98, 0.92 mm long; scutellum 0.08–0.11,0.10 mm long.

Wing: Wing 2.23–2. 47, 2.41 mm long; 0.91–1.09, 0.98 mm wide.

Abdomen: Abdomen 1.11–1.58, 1.37 mm long.

Female terminalia: Cercus 2 evenly rounded apically. Sternite 10 elongated. Gonocoxite 9 small.

Distribution: Known from several localities in Ghana, West Africa.

Figures

FIGURES 11 – 14. Mycomyiella ghanaensis new species. Male terminalia: 11 ventral; 12 dorsal; 13 sternite 8; 14 gonostylus. FIGURES 15 – 18. Mycomyiella irwini Väisänen, 1994. Male terminalia: 15 ventral; 16 dorsal; 17 sternite 8; 18 gonostylus.