Muscidifurax sinesensilla Xiao & Zhou

Xiao, Hui, Zhou, Shi-yu & Tong, Yan-feng, 2018, A taxonomic study of Muscidifurax Girault & Sanders from China (Hymenoptera, Chalcidoidea, Pteromalidae), ZooKeys 776, pp. 91-103 : 91

Muscidifurax sinesensilla Xiao & Zhou sp. n. Figs 8-14

Diagnosis.

Fore wing with marginal fringe; inner margins of eyes angularly produced upwards (small angle shape) near the vertex; Fu1 without sensilla; head 1.82 × as broad as long dorsally; propodeum without coarse rugae; gaster 1.8 × as long as broad.

Description.

Holotype. Female. 2.5 mm (Fig. 8). Head and mesosoma dark blue, with metallic reflections; gaster brown with yellow spot. Antennal scape yellowish brown, flagellum dark brown; legs yellow except coxae concolorous with body, and femora and pretarsi brown; fore wings hyaline, venation brown except marginal vein dark brown.

Head in frontal view 1.17 × as wide as high; inner margins of eyes angularly produced upwards (small angle shape) near the vertex (Fig. 9); eye height 0.54 × head height, eyes separated by 1.53 × their height; antennal scrobes deep, not reaching anterior ocellus; reticulation in antennal scrobe smaller than that on parascrobe. Antennal insertion on lower ocular line, distance from upper margin of torulus to lower margin of anterior ocellus 1.78 × distance from lower margin of torulus to lower margin of clypeus. Clypeus with longitudinal striation; clypeal margin slightly protruded, straight; oral fossa 0.5 × as wide as head; right mandible with four teeth, left mandible with three teeth. Head in lateral view with malar sulcus conspicuous, eye height 1.25 × malar space. Antennal scape length 1.34 × eye height, reaching anterior ocellus, but not exceeding vertex; length of flagellum and pedicel combined longer than head width (1.2 ×); pedicel in lateral view 2 × as long as broad; anellus transverse; Fu1 1.67 × as long as broad, slightly longer than Fu2; each funicular segment with sensilla except Fu1 (Fig. 10); clava not clavate, 2.35 × as long as broad. Head in dorsal view, 1.82 × as wide as long; vertex convex; eye length 2.55 × temple length; POL 0.76 × OOL.

Head 1.04 × as broad as mesosoma. Mesosoma not distinctly convex, 1.41 × as long as broad. Pronotum 0.74 × as broad as mesoscutum, anteriorly margined, posterior band smooth and with a row of hairs. Mesoscutum 1.91 × as broad as long; notauli incomplete, only distinct basally. Scutellum with reticulation shallow, frenal line absent. Propodeum (Fig. 11) medially 0.65 × as long as scutellum, reticulation irregular; plicae complete, separated by 1.23 × medial length of propodeum; median carina raised and complete; nucha short; propodeal spiracles oval, 1.5 × as long as broad. Fore wing 2.35 × as long as broad, with marginal fringe (Fig. 12); basal vein and basal cell bare; upper surface of costal cell hairy, lower surface with scattered setae; submarginal vein 1.32 × marginal vein, marginal vein 1.82 × postmarginal vein, postmarginal vein longer than stigmal vein (1.3 ×); stigmal vein straight, stigmal slightly capitate.

Gaster sessile, spindle-shaped with apex pointed, 1.8 × as long as broad, 1.45 × as wide as thorax; each segment with hind margin entire except hind margin of Gt1 trilobed.

Male. As female, with the following differences. Body length 2.0 mm (Fig. 13). Antennal insertion above the lower ocular line (Fig. 14), Fu1 0.44 × as long as scape, each funicular segment longer than broad, with 3-4 rows of setae.

Variability.

Females: body length 2.3-2.5 mm, others same as holotype. Males: body length 1.4-2.2 mm.

Remarks.

This new species is very similar to M. raptor having fore wing with marginal fringe and inner margins of eyes angularly produced upwards near the vertex. It differs from M. raptor in having the first funicular segment without sensilla, propodeum without coarse rugae.

Material examined.

Holotype. ♀, China: Xinjiang: Urumqi, 43.45°N 87.36°E, VII.2016, ex. Pupa of Musca domestica , leg. Hao-yuan Hu, IOZ(E)1812546 (2016-WJ-044). Paratypes. 7♂, IOZ(E)1812547-1812553(2016-WJ-045), 2♀, IOZ(E)1812554-1812555(2016-WJ-044), same data to holotype.

Etymology.

The specific name is derived from the Latin sine- and sensilla, referencing the character of Fu1 without sensilla. The name is to be treated as a noun in apposition.

Hosts.

Pupa of Musca domestica .

Distribution.

China (Xinjiang).