Strongylophthalmyia sumatrana Evenhuis

Evenhuis, Neal L., 2016, World review of the genus Strongylophthalmyia Heller (Diptera: Strongylophthalmyiidae). Part I: Introduction, morphology, species groups, and review of the Strongylophthalmyia punctata subgroup, Zootaxa 4189 (2), pp. 201-243 : 238

Strongylophthalmyia sumatrana Evenhuis , n. sp. ( Figs. 35 , 59 )

Diagnosis. Most similar in appearance to S. palpalis Papp based on similar antennal characters, but can be easily separated from it by the differently shaped male palpus (spherical in S. palpalis ; subtriangular, flared apically, but not spherical in S. sumatrana ).

Description. Lengths. Ƌ: body, 3.2 mm; wing, 3.0 mm. Male. Head: prognathus; frons shining brown, yellow above antennae; face yellow; gena yellow, silvery pollinose, row of short white hairs ventrally; occiput brown, yellowish brown posteroventrally; clypeus small, rectangular, yellow; palpus flared and rounded apically, slightly bifid, with sparse white hairs; proboscis yellowish brown apically.

Antenna ( Fig. 35 ) scape and pedicel yellow; flagellomere ovoid, yellow, clothed with white hairs, dorsal process a small bump distal to base of arista, with white hairs; arista 1.5 times length of dorsal process, styliform, bare.

Thorax: shining; mesonotum yellow, scutellum yellowish brown, dorsum with numerous white hairs; pleura yellow, anepisternum bare; katepisternum with white hairs ventrally near mid coxa.

Wing: hyaline; vein R2+3 nearly straight, ending in costa just beyond level of crossvein dm-cu; crossvein r-m at basal one-fourth of cell dm; veins R4+5 and M1+2 slightly converging distally; crossvein dm-cu almost perpendicular to CuA1; last section of CuA1 to wing margin slightly longer than dm-cu; halter white.

WIP ( Fig. 59 ): generally brassy colored with blue to blue-green in posterior and distal portions of wing; thin band of magenta along R2+3; anal lobe with magenta basally, otherwise, brassy colored.

Legs: yellow; fore coxa with 2 long yellowish white hairs; fore femur dorsally with 2 long thorn-like spicules subbasally, 5 short thorn-like spicules on apical one-third; tarsi white.

Abdomen: tergites I–II yellowish laterally; otherwise abdomen brown with sparse brown hairs dorsally and laterally.

Male genitalia. Not dissected; epandrium and surstylus shining brown, with white hairs, surstylus yellow at apex; cerci light brown, very narrow basally, flared and rounded apically, with long white hairs dorsally, shorter black hairs apically and ventrally

Female. Unknown.

Material examined. Holotype ♂ from INDONESIA: Sumatra : Aceh: Gunung Leuser National Park, Ketambe Research Station [3°41'N, 97°39'°E], 1–28 Feb 1990, D.C. Darling, IIS 9 0 0 0 15 ( ZMB). Holotype deposited in the Zoological Museum, Bogor.

Distribution. Indonesia (Sumatra).

Etymology. This species is named for the island of the type locality.

Remarks. It is interesting to note that Strongylophthalmyia gibbifera Shatalkin from Thailand and Vietnam, has a similarly shaped antennal flagellomere but lacks the spines on the fore femur. Due to this lack of spines, it is thus not included in the punctata subgroup, but the coarctata subgroup.

Figures

FIGURES 34 – 37. Male Strongylophthalmyia, antennae. 34. S. punctata Hennig, holotype; 35. S. sumatrana, n. sp., arrow points to minute dorsal antennal process; 36. S. thaii Papp; 37. S. thailandica, n. sp.

FIGURES 54 – 61. Male Strongylophthalmyia, right wing, dorsal view, Wing Interference Patterns. 54. S. immaculata Hennig; 55. S. lowi, n. sp.; 56. S. malayensis, n. sp.; 57. S. microstyla Shatalkin; 58. S. pappi, n. sp.; 59. S. sumatrana, n. sp.; 60. S. thaii Papp; 61. S. thailandica, n. sp.