Pseudostegana Okada, 1978

Gong, Lu & Chen, Hongwei, 2018, Seven new species of the genus Pseudostegana (Diptera: Drosophilidae) from South-west China, with DNA barcoding information, Journal of Natural History 52 (31 - 32), pp. 2097-2119 : 2100-2101

Pseudostegana Okada, 1978

Stegana (Pseudostegana) Okada 1978: 392 ; Okada 1982: 39. Type species: Stegana (Parastegana) grandipalpis Takada and Momma 1975: 12 .

Pseudostegana: Sidorenko 2002: 14 (as a genus); Chen et al. 2005: 407; Li et al. 2010.

Diagnosis

Postvertical and prescutellar setae absent; ocellar setae outside triangle made by ocelli; arista with one ventral branch except for terminal fork; anterior dorsocentral seta minute; wing hyaline, mostly with dark-coloured band(s); all femora, tibiae and first tarsomeres slender; fore leg first tarsomere with four to six black, short, thick setae; abdominal tergites mostly glossy; seventh tergite present in male ( Chen et al. 2005).

Description

Head: Eye brownish red. Ocellar triangle mostly, broadly or narrowly elongated to anterior margin of frons. Frons mostly glabrous, lacking minute, interfrontal setulae. Anterior reclinate orbital seta minute; posterior reclinate orbital seta situated nearer to proclinate seta than to inner vertical. Arista with long, dorsal branches. Clypeus brown to black. Subvibrissa mostly longer than half length of vibrissa. Palpus slender in female, variable in male. Thorax: Scutum and scutellum dorsally convex. Katepisternal setae two or three; medial one shortest. Scutellum usually pale at tip; subscutellum swollen. Wing: Basal medial-cubital crossvein absent. Costal vein extending beyond tip of R4+5 vein, with five to seven peg-like spinules on ventral surface between veins R2+3 and R4+5. R2+3 vein slightly curved to costa at tip; M vein strongly convergent to R4+5 vein. Halter: stalk greyish; knob white. Legs: Mostly yellow, slender. Mid leg tibia basally without strong, postero-dorsal setae. Abdomen: Sternites usually yellow to brown.

Male terminalia: Epandrium broad, sometimes slightly constricted mid-dorsally, pubescent except for anterior margin. Surstylus separated from epandrium, mostly lacking pubescence, with several setae on outer and inner surfaces. Cercus separated from epandrium, pubescent and setigerous. Hypandrium broad, large, laterally mostly with one pair of paramedian setae, mid-anteriorly connected with apical part of aedeagal apodeme by aedeagal guide. Paramere with two long sensilla distally and several, small sensilla. Gonopods forming postero-median lobe, baso-laterally contiguous to parameres. Aedeagus usually with one pair of flap-like, serrated processes basally. Aedeagal apodeme long, rod-shaped, basally laterally flattened.

Remarks

In the new species described here, only characters that depart from the above universal description are provided for brevity.