Stratiomys approximata Brunetti, 1923

Yatoo, Suhaib Firdous, Maqbool, Amir & Wachkoo, Aijaz Ahmad, 2023, A review of the genus Stratiomys Geoffroy (Diptera: Stratiomyidae) from India with description of a new species, European Journal of Taxonomy 910, pp. 1-13 : 4-7

Stratiomys approximata Brunetti, 1923

Figs 2–3

Stratiomyia approximata Brunetti, 1923: 115 .

Diagnosis

Stratiomys approximata is diagnosed by having eye distinctly hairy, scutellar spines straight or slightly incurved, wing slightly brownish towards middle region, yellow angled spots at edges of abdomen on tergite II, III and IV not joining at middle, mostly black tibiae; black femur, and mostly yellow tarsi with apical 2 segments blackish brown. The species is somewhat similar to S. barca , which can be separated by having yellow spots on tergites joining at middle forming a narrow continuous band, and femur brown and tarsi black.

Material examined

Syntypes

INDIA • 1 ♂; NW Himalayas, Kashmir; 1915; H.T. Pease leg.; ZSI 3646 /H2 • 1 ♀; NW Himalayas, Kashmir, Jhelum Valley ; alt. 5200 ft; 7 Sep. 1915; H.T. Pease leg.; ZSI 3647 /H2. Images match our specimens, but we have not examined the actual specimens .

Additional material

INDIA – Jammu and Kashmir • 2 ♂♂, 3 ♀♀; Dist. Baramulla, Watlab ; 34°21′38″ N, 74°31′29″ E; alt. 1607 m; 10Aug. 2020; S.F.Yatoo leg.; CUZM S_Yatool00007 to S_Yatool00011 • 1 ♂; Dist. Kupwara, Handwara, Bata Pora Magam ; 34°22′44.8″ N, 74°13′43.5″ E; alt. 1680 m; 5 Sep. 2021; A. Maqbool leg.; CUZM A_Maqbool00012 .

Redescription

MEASUREMENTS. Male ( Fig. 2 ): body length, 11.7–12.2 mm; wing length, 9.8–9.9 mm; female ( Fig. 3 ): body length, 11.9–12.5 mm; wing length, 9.6–10.6 mm.

HEAD. Elliptical in anterior view, eyes distinctly hairy, antenna with 5 flagellomeres, black except for brownish pedicel and yellowish-brown base of 1 st flagellomere, flagellum longer than scape and pedicel combined; area around antenna black ( Fig. 2D–E ); face black with two small yellow spots in male, near eye margin below base of antenna ( Fig. 2C–E ), much wider spots in female starting above antennal base and extending almost to lower margin of eye, leaving black pattern extending along frontal depression and continuing as broad medial stripe on face ( Fig. 3D–G ).

THORAX. Black with yellowish white dense and long pilosity ( Fig. 2H–I ); scutellum mostly black except for narrow yellow band along apical margin with two prominent spines ( Fig. 2J ); wing generally hyaline but slightly brownish towards middle region with brownish veins; veins M 1, M 2, M 3 and M 4 curved, ending before wing margin; vein r-m <M 2 ( Figs 2K , 3K ); legs mostly black with tarsus, base and apex of tibia yellow.

ABDOMEN. Black, broader than thorax with whitish yellow angled spots at edges of abdomen on tergite II, III and IV; spots on 2 nd tergite wider ( Fig. 2L–M ); abdomen banded ventrally, sternites black with yellow margins, joined in middle forming a continuous yellow band from 2 nd –4 th sternite.

MALE TERMINALIA ( Fig. 2N–P ). Epandrium convex and semioval with emarginate anterior margin, transverse posteriorly, with short fine setae, denser towards lower and lateral margins and sparsely distributed towards centre; proctiger subtriangular with suboval cercus having posterior margin obliquely transverse, margins with large and small setae ( Fig. 2N ); in lateral view, cercus covering terminalia up to base of distal portion where aedeagal lobes are joined; synsternite triangular, with short and thick setae on middle portion and longer setae on lower middle and lateral margins; distal margin of synsternite arcuate medially, laterally produced into oval processes with round margin; gonostylus longer than wide, placed on distal third of synsternite, ending in short pointed edge; gonocoxal apodemes reaching up to anterior margin of genital capsule ( Fig. 2O ); phallus smooth, distinctly longer than genital capsule, tripartite distally, medial lobe distinctly shorter and wider than outwardly divergent lateral lobes ( Fig. 2P ); medial lobe arcuate terminally, lateral lobes pointed.

FEMALE TERMINALIA ( Fig. 3N–O ). Tergite 9 nearly rectangular, anterior margin sub-medially emarginate, creating nearly triangular process medially; tergite 10 strongly triangular, distal apex rounded; cerci ovate, narrow at base and wider towards apex ( Fig. 3N ); genital fork wide, anterior third more or less semicircular, narrower than posterior two-thirds; posterolateral process wider basally, narrower and strongly convergent towards apex; posterior bridge with shorter projections ( Fig. 3O ).

Distribution

China (Hankow, Shanghai), India (Kashmir), Pakistan (Jhelum Valley).

Figures

Fig. 2. Stratiomys approximata Brunetti 1923, ♂ (CUZM S_Yatoo100007). A. Habitus, dorsal view. B. Habitus, lateral view. C. Habitus, ventral view. D. Head, frontal view. E. Head, lateral view. F. Head, dorsal view. G. Antenna. H. Thorax, lateral view. I. Thorax, dorsal view. J. Scutellum. K. Wing. L. Abdomen, dorsal view. M. Abdomen, lateral view. N. Epandrium, proctiger and cerci, dorsal view. O. Terminalia, dorsal view. P. Terminalia, ventral view. Abbreviations: cerc = cercus; epand = epandrium; goncx = gonocoxite; goncx apod = gonocoxal apodeme; gonst = gonostylus; lt lb = lateral lobe; md lb = medial lobe; ph = phallus; prct = proctiger; synst = synsternite. Scale bars: A–C = 1.0 mm; D–M = 0.5 mm; N–P = 0.1 mm.

Fig. 3. Stratiomys approximata Brunetti 1923, ♀ (CUZM S_Yatoo100009). A. Habitus, dorsal view. B. Habitus, lateral view. C. Habitus, ventral view. D. Head, frontal view. E. Head, lateral view. F. Head, dorsal view. G. Head, ventral view. H. Antenna.I. Thorax, dorsal view. J. Thorax, lateral view. K. Wing. L. Abdomen, lateral view. M. Abdomen, dorsal view. N. Terminalia, dorsal view. O. Genital fork, dorsal view. Abbreviations: cerc = cercus; go = genital opening; pb = posterior bridge; pp = posterolateral process; tg = tergite. Scale bars: A–C, K = 1.0 mm; D–J, L–M = 0.5 mm; N–O = 0.1 mm.