Nasimyia eurytarsa, Yang, Zai-Hua, Hauser, Martin, Yang, Mao-Fa & Zhang, Ting-Ting, 2013

Yang, Zai-Hua, Hauser, Martin, Yang, Mao-Fa & Zhang, Ting-Ting, 2013, The Oriental genus Nasimyia (Diptera: Stratiomyidae): Geographical distribution, key to species and descriptions of three new species, Zootaxa 3619 (5), pp. 526-540 : 529-532

Nasimyia eurytarsa sp. nov.

( Figs. 1–9 , 28–29 , 34 )

Diagnosis. This species is mainly black; abdomen slender, pedunculate, tergite 2 narrowest; in both sexes the apical half of hind femur, apical 3/4 of hind tibia and hind basitatarsus expanded and black; gonostylus without any protuberance at the inner margin; aedeagal complex bipartite.

Description. Male. Body length 7.2–7.5 mm, wing length 5.4–5.6 mm.

Head ( Figs. 1, 3 , 28 ) heart-shaped in frontal view, semicircular in lateral view; width almost equal to thorax, shining black. Ocellar tubercle shining black, distinctly prominent, with sparse hairs. Posterior part of head slightly concave. Eyes reddish brown, contiguous, upper facets distinctly larger than lower. Upper frons shining black, small, with sparse yellowish white hairs on lateral margin; frons sub-triangular, black and bare, but lateral margin along eye with white tomentum. Antenna ( Fig. 6 ) twice as long as head, scape and pedicel yellowish brown, with darker hairs, scape twice as long as pedicel; first flagellomere brown, following flagellomeres black, with densely black and short hairs; length of each flagellomere longer than its width; relative lengths of antennal scape, pedicel and flagellomeres 1.1:0.5:1.3:0.8:0.8:0.8:0.8:0.8:0.8:0.8, relative widths of antennal scape, pedicel and flagellomeres 1.1:1.2:1.0:1.0:1.0:1.0:1.0:0.9:1.0:1.0. Face shining black, black hairs on center of protuberance, remainder of face with white hairs, lateral vitta consisting of white tomentum distinct along eye margin. Occiput shining black with sparse, pale short hairs. Proboscis yellowish brown, but its base darkened, with sparse hairs. Palpus black.

Thorax ( Figs. 1, 3 ) relatively stout and short, approximately 1.4 times longer than wide; black, but postpronotal callus, postalar callus and hind margin of scutellum light brown; scutum with dense punctation and decumbent golden short hairs. Pleura with light hairs, but anepisternum bare; scutellum black, with yellowish and rounded posterior margin. Wing ( Fig. 5 ) mostly hyaline, but with a median transverse dark spot near discal cell and subapical dark spot extending over entire cell r4; veins and stigma dark brown, wing with microtrichia over most of surface. Leg: forecoxa yellow, mid- and hindcoxa black; fore- and midfemur yellowish white; basal part of hindfemur yellowish white, gradually transitioning to black, but with yellowish white apex; basal half of fore- and midtibia and basal third of hind tibia brownish yellow, apical 3/4 dark brown to black; tarsi yellowish white except hind basitarsus black; apical half of hind femur and tibia expanded toward tip, hind basitarsus distinctly expanded. Halter dark with yellow stem.

Abdomen ( Figs. 1, 3 ) slender, twice as long as thorax, but distinctly narrower, basal width of tergite 1 only half of thorax, tergite 1 narrowing posteriorly, the middle of tergite 2 narrowest, remaining part of abdomen gradually broadened till hind margin of tergite 5, which is the widest part of abdomen; abdominal dorsum wholly shining black, with dense punctation and sparse gray hairs on basal half longer and erect; venter similar to dorsum. Male terminalia ( Figs. 7–9 ) exposed, epandrium nearly heart-shaped, with sparse hairs; proctiger small, hidden beneath epandrium, only tip visible; hind margin of genital capsule with median groove; gonostylus thick, raised at outside margin, with a prismatic protuberance at basal inner margin; aedeagal complex well developed, bipartite, each lobe expended in apical half.

Female ( Figs 2, 4 , 29 ). Body length 8.1 mm, wing length 6.0 mm. Similar to male except as follows: eyes separated by frons (dichoptic); frons broad, shining black, with almost parallel lateral sides, lateral margin with symmetrical irregular spots formed by white tomentum, narrowest width of frons occupying 1/3 of head, sternites wholly black.

Specimens examined. Holotype: 3, CHINA, Yunnan Province, Baoshan, Mts. Gaoligong (24°58’N, 98°48’E), 1800–2400m, 29.V.-3.VI.2009, Zaihua Yang & Bin Li leg. (GUGC).

Paratypes: CHINA, 13, 1Ƥ, same date with Holotype (GUGC). 113, 4ƤƤ, with the some locality label as the holotype but with date and collectors 15.VI.2009, Zaihua Yang leg., (73, 4ƤƤ), 13.VI.2009, Bin Zhang leg. (23), 13.VI.2009, Yujian Li leg. (13), 13.VI.2009, Jiankun Long leg. (13) (GAFC).

THAILAND: 13, 1Ƥ Northern Thailand, Mae Hong Son Prov., Pangmapha Distr., near Ban Nam Rin, sweeping vegetation (bamboo), 18.V. 2011, 929m, D. Kovac leg., (19°27’N, 98°17’E) (SMF).

Geographical distribution ( Fig. 34 ). China (Yunnan), Thailand.

Etymology. Eurys (gr.) = broad, tarsos (gr.) = foot. The name refers to the expanded hind basitarsus.

Remarks. This new species is similar to N. megacephala ; but can be distinguished from it by the abdomen being strongly constricted, in both sexes the apical half of the hind femur, apical 3/4 hind tibia and the hind basitarsus are nearly black and expanded. Both sexes of N. megacephala have the abdominal lateral margins nearly parallel, the abdomen nearly wholly black, legs yellow, at most tarsi darkened at apex and hind basitarsus not expanded.

Figures

FIGURE 34. Map showing the known geographical distributions of Nasimyia spp.

FIGURES 1 – 4. Nasimyia eurytarsa sp. nov. adult: 1, male, dorsal view; 2, female, dorsal view; 3, male, lateral view; 4, female, lateral view.

FIGURES 5 – 9. Nasimyia eurytarsa sp. nov. 5, wing; 6, flagellum; 7, proctiger, cerci and epandrium, dorsal view; 8, aedeagal complex, lateral view; 9, genital capsule and aedeagal complex, dorsal view.

FIGURES 28 – 33. Frontal view of Nasimyia heads. 28, head of N. eurytarsa sp. nov., male frontal view; 29, head of N. eurytarsa sp. nov., female frontal view; 30, head of N. elongoverpa sp. nov., male frontal view; 31, head of N. elongoverpa sp. nov., female frontal view; 32, head of N. rozkosnyi sp. nov., male frontal view; 33, head of N. rozkosnyi sp. nov., female frontal view.