Isoneuromyia singula Xu, Cao et Evenhuis

Xu, Huachao, Cao, Jian, Wu, Hong, Evenhuis, Neal L. & Zhou, Zuji, 2007, Four new species of Isoneuromyia from China (Diptera: Keroplatidae), Zootaxa 1423, pp. 51-57 : 54-56

Isoneuromyia singula Xu, Cao et Evenhuis , n. sp.

( Figs. 3, 7 , 11, 12 )

Diagnosis. Similar to I. yorki Evenhuis in both having the vertex and occiput black and the tibial spurs black. It can be easily distinguished from I. yorki by gonostyli reduced, with only one dark tooth and paramere strong, in lateral view shaped like a broom, with very dense black short hairs apically (paramere relatively weak and gonostyli subtriangular in shape, apex with two black teeth apically in yorki ).

Description. MALE. Lengths: Body: 7.2 mm; wing: 5.6mm.

Head. Vertex and occiput black, with fairly dense small black recumbent hairs. Ocelli in horizontal line. Frons light brown, bare. Antennae: scape and pedicel cup-shaped, brownish black. Flagellum: segments slightly compressed, brownish black. Face brown, with small black hairs apicolaterally. Palpi brown. Proboscis yellowish brown.

Thorax. Mesonotum ( Fig. 3 ) brownish black, with brown bristles. Scutellum black. Patch of thick black setae above wing root and on posterior margin of scutellum. Prescutellar area tapering to scutellum. Pronotal lobes black with dense black setae. Pleura, laterotergite and mediotergite brownish black, bare. Halter light brown, knob ivory white dorsally.

Legs. Coxae yellow with brown basally, fore coxa, and apex of mid and hind coxae, with recumbent black hairs. Fore and mid femora brownish black at base, remainder of them ivory white; hind femur black, all with recumbent black hairs. Fore tibia without comb, mid with only posterior comb, hind tibiae with anterior and posterior comb. Tibial spurs black. Fore basitarsus 1.3x length of fore tibia, mid basitarsus subequal in length to length of mid tibiae, hind basitarsus 0.8x length of hind tibia. Claws minute.

Wing ( Fig. 7 ). Hyaline, with brown infuscation subapically from costa to middle of cell m2, fading posteriorly; vein R4 straight, ending in C slightly beyond end of R1; vein M2, CuA1 not reaching wing margin, A1 quite reaching wing margin.

Abdomen. tergites I–II black; tergite III brownish black with white spots at basal sides; tergites IV sometimes with smaller white spots basolaterally; tergites V–VIII brownish black, all of the tergites with dense recumbent black hairs. Sternites patterned as on tergites.

Hypopygium ( Figs. 11, 12 ). Not dissected. Gonocoxites brownish, with black pilose on about apical half. Gonostyli reduced, brown, with black pilose, apex with only one dark tooth. Paramere strong, in lateral view shaped like a broom, with very dense black short hairs apically.

FEMALE. As in male, but terminal segments of abdomen (III–V) expanded; cerci brown, small, only slightly exserted.

Types. Holotype ɗ (ZJFC 060222) and paratype from: China: Sichuan province: Wanglang National Natural Reserve, 2500 m, 26 July 2006, Jian Cao, Yiping Wang et al.

Etymology. The species epithet derives from the Latin singulus = single, referring to the gonostylar apex with only one tooth.

Figures

FIGURES 1 – 8. 1 – 4. Isoneuromyia thoraces, dorsal view. 1. I. sinica, n. sp. 2. I. completa, n. sp. 3. I. singula, n. sp. 4. I. wolongensis, n. sp. 5 – 8 Isoneuromyia wings. 5. I. sinica, n. sp. 6. I. completa, n. sp. 7. I. singula, n. sp. 8. I. wolongensis, n. sp.

FIGURES 9 – 13. Isoneuromyia male genitalia. 9. I. sinica, n. sp. ventral view (cerci and proctiger omitted). 10. I. completa, n. sp. ventral view (cerci and proctiger omitted). 11. I. singula, n. sp. ventral view (cerci and proctiger omitted). 12. I. singula, n. sp. lateral view (gonostyli omitted) 13. I. wolongensis, n. sp. ventral view (cerci and proctiger omitted). Scale bar = 0.1 mm.