Stenophragma collessi, Oliveira & Amorim, 2012

Oliveira, Sarah Siqueira & Amorim, Dalton de Souza, 2012, Two New Species of Stenophragma Skuse from Western Australia (Diptera, Mycetophilidae, Sciophilinae), Records of the Australian Museum 64 (2), pp. 149-158 : 154-156

Stenophragma collessi n.sp.

Figs. 4 , 14–20

Diagnosis. Wing with light brown maculation on sc-r, on first section of Rs, R 4 and r-m, on first section of CuA, and a light brown sinuous band anteriorly on apical third of wing, from apex of R 1 to apex of M 4; R 4 present. Gonostyle long, with a ventral and a dorsal branches; T9 rounded at anterior margin, widening to apex. Female ce2 with three spines few sclerotized apically in the inner surface.

Material examined. Holotype, ♂, AUSTRALIA, Western Australia, 28km W. Yalgoo, 2 Sept. 1981, Malaise trap, G. A. Holloway coll. ( AMSA K351926 ) . Paratype: ♀, AUSTRALIA, Western Australia, 50km NW Yuna , 6 Sept. 1981, ex Malaise trap, G. A. Holloway coll. ( AMSA K351927 ) . Additional material. 1 individual, sex unknown, AUSTRALIA, Western Australia, 28km W. Yalgoo, 2 Sept. 1981, Malaise trap, G. A. Holloway coll. ( AMSA) .

Description. Male. Head. Vertex brown, with scattered setulae. Two ocelli separated from the eye margin by less than their own diameter. Occiput brown. Eye setose. Scape and pedicel yellowish, rounded, with small setulae; first flagellomere light brownish on basal third and brown on apical two thirds, almost twice as long as wide, with scattered setae. Frons yellowish, clypeus light brown, covered with short setae; labella and palpus light brown; first and second palpomeres almost of same length; third to fifth increasingly longer, last one almost twice the length of penultimate. Thorax. Scutum light brown, with three large longitudinal bands brown. Scutellum light brown. Pleural sclerites light brown. Pleural membrane yellowish. Scutum moderately arched, covered with scattered small setae. Scutellum with many setulae and six longer setae. Pronotum setose, with some stronger setae. Anepisternum and katepisternum almost straight ventrally, bare. Mesepimeron reaching ventral margin of thorax, bare. Laterotergite slightly projected outwards, with 9–11 setae of different sizes, suture at contact with mediotergite incomplete dorsally. Mediotergite slightly curved in profile, ventral half with two longer setae laterally and smaller ones mesally. Haltere with whitish yellow pedicel and light brown knob, some few setae on pedicel, knob more densely setose. Coxae I and III whitish yellow, coxa II whitish yellow with basal half light brown, femora, tibiae and tarsi whitish yellow. First tarsomere more than twice the length of second one; tibiae and tarsi with erect darker short bristles ventrally along almost entire length, those on hind tibia more or less aligned dorsally and laterally. Tibial spurs 1:2:2, about twice the length of tibial width at apex, internal spurs few shorter. Wing ( Fig. 4 , female wing). Length 3.5 mm, width 1.5 mm. Membrane homogenously hyaline, except light brown maculation on sc-r, on first section of Rs, R 4 and r-m, on section of CuA (beyond insertion of M 4), and a light brown sinuous vertical band at beginning of apical third of wing, running from apex R 1 apex to apex of M 4; membrane densely covered with microtrichia on all cells, macrotrichia widely distributed, more sparsely on basal half, densely on distal half. Sc complete, reaching C beyond base of Rs, with few setae, well sclerotized. C ending before wing apex, extending for just a short distance beyond R 5. First sector of Rs almost perfectly transverse, devoid of setae, less than half length of r-m. R 1 relatively long, reaching C on apical fourth of wing; R 4 present; R 5 with nine regular rows of short spines; dorsal branch with three strong spines of different sizes. Aedeagus bifid at apex; parameres membranous, thin at apex; gonocoxal apodeme well developed and sclerotized. T9 long, setose, widening to the apex, rounded at anterior margin, inner surface with a concentration of thin, long setae apically. Cerci weakly sclerotized, covered with many setulae.

Female. As male, except for the following features. Wing length, 4.0 mm, width, 1.6 mm. Wing ( Fig. 4 ). Abdomen brown, with some yellowish spots mesally and posteriorly on tergites and sternites. Terminalia ( Figs. 19–20 ). Terminalia yellowish. Sternite 8 elongated, with a pair of gonapophyses each with a shallow distal incision, divided by a mesal deeper incision, covered with microtrichia and fine, elongated setae; S9 (genital fork) wide, with a short anterior arm; S10 membranous, rounded at apex, with microtrichia; T8 wide, short mesally, longer than T9, covered with setae; T9 wide, short mesally, covered with setae; T10 not visible; ce1 more than twice ce2 length, covered with microtrichia and scattered setae; ce2 ovoid, covered with microtrichia, few setulae, and three not strongly sclerotized spines.

Etymology. The species name is masculine, named after the great Australian dipterist, Donald H. Colless (24 August 1922 – 16 Feb 2012), of the CSIRO Division of Entomology’s Australian National Insect Collection (ANIC), who has given an outstanding contribution to the understanding of the diversity of different groups of flies in Australasian region.

Comments. Stenophragma collessi n.sp. and S. picticornis , both from southern Western Australia, have in common a gonostyle with two well characterized branches, bearing strong spines. Nevertheless, the differences in the wing and male terminalia features are more than enough to consider them separate species.

Figures

Figures 3–4. Wings of Stenophragma. (3) S. bickeli n.sp. paratype. (4) S. collessi n.sp. paratype. Scale 0.5 mm.

Figures 14–18. Male terminalia of Stenophragma collessi n.sp. holotype. (14–15) Terminalia, dorsal view.(16) Detail of tergite 9 and cerci in dorsal view (left) and in

Figures 19–20. Female terminalia of Stenophragma collessi n.sp. paratype. (19) Terminalia, dorsal view. (20) Detail of sternites 8 and 10, ventral view. Scales 0.1 mm.