Ptecticus artocarpophilus, Rozkošný, Rudolf & Hauser, Martin, 2009

Rozkošný, Rudolf & Hauser, Martin, 2009, Species groups of Oriental Ptecticus Loew including descriptions of ten new species with a revised identification key to the Oriental species (Diptera: Stratiomyidae), Zootaxa 2034, pp. 1-30 : 3-4

Ptecticus artocarpophilus sp. nov.

( Figs 1–3 )

Type material: Holotype, male, PHILIPPINES, Sulu Batu Batu, Tawi-Tawi, jackfruit, 17.iv.1961, M.D. Delfinado leg., in BPBM. Paratypes, 2 males with the same locality labels, in BPBM.

Etymology: The specific name indicates that the male holotype was captured on a jackfruit ( Artocarpus ).

Diagnosis. A species from the P. australis group with a black frons, vertex and complete occiput. The thorax is yellow, the wing with vein M3 parallel to M2 and the indistinct, hyaline postcubitus. The hind tibia and the basal third of the hind basitarsus are black, the rest of the hind tarsus is white. The male terminalia are species-specific.

Description. Male. Head semiglobular, with markedly prominent frontal callus. Frons, ocellar tubercle, vertex and occiput completely black. Frons tapered towards frontal callus and immediately above it very narrow, nearly linear. Frontal callus rounded in profile, distinctly higher than scape is long, drop-like in frontal view, white. Antenna yellow, scape slightly longer than broad at distal margin, pedicel with usual subtriangular projection on inner surface, flagellar complex almost round, subapical arista brown. Face whitish, proboscis yellow. Head pile pale yellow, mainly erect, longest hairs reaching length of scape.

Thorax shining yellow, only extreme lateral corners of scutellum darkened. Thoracic pile inconspicuous, yellow, on scutum generally shorter than frontal hairs but distinctly longer on propleuron, notopleuron, katatergite and mediotergite. Hairs on other pleural parts mostly erect, longer than pile on disc of scutum, anepisternum extensively bare.

Wing almost hyline, shining, pterostigma yellow. Radial triangle (r2+3) low and long, R2+3 starting shortly before anterior crossvein, almost parallel to R1, much longer than Rs. Crossvein R-M almost as long as distal margin of discal cell, upper posterior margin of discal cell almost straight, posterior crossvein absent. Vein M3 straight, parallel to M2, its apical fourth reduced. Postcubitus (CuP) only hyaline, not pigmented. Halter darkened, only basal half of stem yellowish. Posttegula with a bunch of black hairs.

Legs yellow but fore tarsus beginning from middle of basitarsus and last 3–4 tarsomeres of mid tarsus darkened. Hind femur yellow, hind tiba and basal third of hind basitarsus black, rest of hind tarsus snow white. Pile on legs generally corresponding with ground colour, i.e. yellow on yellow parts, black on black parts and white on white parts but many black hairs visible also on outer surface of yellow hind femora.

Abdomen yellow with black transverse bands. Black bands reaching lateral margins at least on basal 3 tergites and occupying less than basal half on tergite 1 and almost half of tergites 2–4, leaving only narrow anterior margin and broad posterior margin of tergites yellow. Tergite 5 with extensive black central marking leaving both yellow margins of same width. Also tergite 6 with a broad dark transverse band. Venter mainly yellow. Abdominal hairs yellow and long especially on tergite 1 and along lateral margin on basal half of abdomen. Darker parts with dense, mainly appressed and short black hairs, but sparse black hairs visible also in yellow areas of all tergites. Ventral hairs yellow, sparse and mainly appressed.

Male terminalia ( Figs 1–3 ) yellowish brown, covered with black hairs. Epandrium arched, slightly longer than wide, with slender surstyli, proctiger with cylindrical, brown cerci relatively short, inserted almost in middle of proctiger. Genital capsule rounded, with bilobed distal margin on each side, medial process barely prominent, with short incision in middle. Gonostylus bilobed, outer basal lobe slender and short. Gonocoxal apodeme not extending beyond proximal margin of genital capsule. Aedeagal complex fine and flat, bicornute apically.

Length: holotype. Body 9.0 mm, wing 9.8 mm; paratypes: body 10.3–10.4 mm, wing 10.9–11.1 mm.

Female. Unknown.

Remarks. P. artocarpophilus sp. nov. is apparently related to P. australis Schiner, 1868 and P. srilankai Rozkošný & Hauser, 2001 , regarding the well developed surstyli on the epandrium. However, the surstyli of both these species are lamellate, flat and dilated in apical part, not rod-like and pointed as in P. artocarpophilus sp. nov. Moreover, the aedeagal complex is larger in P. srilankai but even more reduced in P. australis .

Figures

FIGURES 1 – 3. Ptecticus artocarpophilus sp. nov., male terminalia. 1, lateral view. 2, epandrium, proctiger and cerci. 3, genital capsule, gonostyli and aedeagal complex. Scale: 0.5 mm. For abbreviations see material and methods.