Nasimyia, Yang, Zaihua & Yang, Maofa, 2010

Yang, Zaihua & Yang, Maofa, 2010, A new genus and two new species of Pachygastrinae from the Oriental region (Diptera: Stratiomyidae), Zootaxa 2402, pp. 61-67 : 61-62

Nasimyia gen. nov.

Type species: Nasimyia megacephala sp. nov., by present designation.

Diagnosis. This genus can be easily separated from other Oriental pachygastrines by the face with a conical (nose-like) median protuberance. The antenna is about 2.5 times longer than the head, the flagellum consists of 8 cylindrical flagellomeres, each at most slightly longer than broad. The scutellar spines are not present. Ve in R 2+3 starts well beyond crossvein r-m, R4 is present. The abdomen is longer than the thorax, 2.3-2.8 times as long as its 4th segment is broad.

Description. Male. Head ( Figs. 3 –4,13–14) with large eyes occupying most of anterior and lateral head surface; eyes bare, contiguous, upper facets larger than the lower. Ocellar tubercle shining black, bare, distinctly prominent. Upper frons small, tringular, with a distinct longitudinal median groove; lower frons subtriangular. Antennae (Fig. 7,17) close together at base, 2.5 times as long as head, wholly densely but short haired; length of scape and pedicel almost equal, flagellum with 8 flagellomeres, each as long as broad or slightly longer than broad. Face with nose-like, conical, median projection oriented downward in lateral view. Occiput not visible in lateral view but narrow postocular area more or less distinct in lower part of head. Palpus two-segmented, first segment shorter than second, second segment ovoid.

Thorax ( Figs. 1 , 11 ) including scutellum about 1.7 times longer than wide, black, densely punctated and short haired. Scutellum with rounded posterior margin, without scutellar spines. Legs without significant modifications. Wing ( Fig. 7 ) with vein R2+3 originating beyond crossvein r-m at a distance being longer than crossvein, R4 present.

Abdomen ( Figs. 1 , 11 ) relatively flat and slender, always more than twice as long as broad, broadest in area of 4th segment, densely punctate and sparsely haired. Male terminalia( Figs 8–10 , 18–20 ) of simple type, genital capsule rounded or more subquadrate, its posterior margin without prominent medial part, gonostylus simply tapered, gonocoxal apodemes slightly reaching beyond proximal margin of genital capsule, aedeagal complex tripartite.

Female. Differing from male as follows: Eyes separated ( Figs 5 , 15 ), frons slightly diverging toward face, in middle occupying about one third of head width, no longitudinal median groove on frons developed. Female terminalia with two-segmented cerci, both cercal segments cylindrical, subequal in length.

Etymology. The name is combined from the Latin “nasus“ (= nose) and “myia“ (= fly) and refers the nose-like projection on the face. Gender: feminine

Remarks. The conical projection of the face of Nasimyia gen. nov. is also characteristic of the genus Hermetia Latreille, 1804 , ( Rozkošný & Kozánek, 2006), but can be distinguished by their different wing venation. Some Afrotropical genera such as Ashantina Kertesz, 1914 and Merstomeringina James, 1952 also have some similar characteristics ( Woodley, 1987), but their antennae have a style or arista. However antennal form is apparently unique within Pachygastrinae of Oriental Region. The new genus is close to the group of genera characterized by having bare eyes, long antennae without an arista, unarmed scutellum, wing vein R2+3 a risin g w ell be yo nd th e sh ort r- m c ross vei n, v ein R 4 p res ent a nd a n elo ng ated abd om en ( Parastratiosphecomyia , Pseudomeristomerinx and Stratiosphecomyia ). Parastratiosphecomyia and Stratiosphecomyia differ by their pedunculate abdomen and distinct shape of the male genitalia (moreover, the antennae are wide apart at the base in Parastratiosphecomyia ). Pseudomeristomerinx is most closely related to the new genus. The male terminalia are fairly similar although they are rather simple and unmodified in both genera. Nevertheless, Pseudomeristomerinx may be easily distinguished by the absence of the facial projection, the yellow pattern on the thorax and the distinct postocular rim in the females.

Figures

FIGURES 1 – 10. Nasimyia megacephala sp. nov. 1, male body, dorsal view. 2, wing. 3, male head, frontal view; 4, male head, lateral view. 5, female head, frontal view; 6, female head, lateral view. 7, antenna. 8, epandrium, proctiger and cerci, dorsal view. 9, aedeagal complex, dorsal view. 10, genital capsule, dorsal view.

FIGURES 11 – 20. Nasimyia nigripennis sp. nov. 11, male body, dorsal view. 12, wing. 13, male head, frontal view; 14, male head, lateral view. 15, female head, frontal view; 16, female head, lateral view. 17, antenna. 18, epandrium, proctiger and cerci, dorsal view. 19, aedeagal complex, dorsal view. 20, genital capsule, dorsal view.