Aclista capitata, Feng & Xu, 2016

Feng, Jun & Xu, Zaifu, 2016, The genus Aclista Förster, 1856 (Hymenoptera: Diapriidae) firstly recorded from China, with descriptions of three new species, Zoological Systematics 41 (3), pp. 273-279 : 275-277

Aclista capitata sp. nov. ( Figs 4–6 )

Material examined. Holotype ♀, China, Yunnan, Zhaotong, Huanghua , 7–9.X.2012, coll. Shiwen Yang, Hua 3- 201210054 ( SCAU). Paratypes. 10♀, same data as holotype, Hua 1-201210065, Hua 2-2012088055, Hua 3-201209004, Hua 3-201210011, Hua 3-201208100, Hua 4-201209005, Li 5-201210117, Li 5-201210121, Li 5-201210133, Sha 3-201210014 ( SCAU) .

Description. Holotype. Female. Body length 3.2 mm. Fore wing length 2.5 mm.

Color. Body blackish-brown. Antennae brown. Legs and mandibles brownish-yellow.

Head. Head in dorsal view 2.20× as wide as long, wider than mesosoma (10.0: 8.5); in frontal view subtriangular, with moderately prominent antennal sockets. Toruli separated from each other, with shallow cleft between them. Mandibles sickle-shaped and overlapping. Clypeus convex, lustrous with pubescence. Face lustrous, with pubescence, without facial furrow. Antenna 15-segmented, with dense pubescence. Scape slender, cylindrical, and bowed slightly. Relative ratio of length to width of antennal segments as follows: 5.2: 1.0, 1.2: 1.0, 3.3: 0.8, 2.5: 0.8, 2.0: 0.8, 1.7: 0.8, 1.5: 0.8, 1.3: 0.8, 1.3: 0.8, 1.2: 0.8, 1.2: 0.8, 1.2: 0.8, 1.2: 0.8, 1.2: 0.8, 2.0: 0.8. Ocelli large. OOL: POL=2.0: 1.5. Eye oval, with sparse pubescence, 1.60× as long as wide. Occipital carina complete.

Mesosoma. Mesosoma with dense pubescence. Pronotal collar distinct in dorsal view. Mesoscutum convex. Notauli complete. Parapsidal line indistinct. Anterior scutellar pit large and trapezoidal. Axillar pits large and rounded, with tuft of pubescence inside. Scutellar disc with conical hump in middle. Dorsellum flat. Propodeum lustrous. Median keel of propodeum simple. Inner plicae converging and not projecting posteriorly. Outer plicae turned outwards posteriorly, ending in a sharp tooth. Fore wing with parastigma 0.65× as long as marginal vein (1.5: 2.3); radial cell closed, 2.39× as long as marginal vein (5.5: 2.3).

Metesoma. Petiole subcylindrical, with indistinct and irregular longitudinal rugosity; 2.25× as long as middle width (4.5: 2.0). Gaster fusiform, tapering at a sharp point. T 2 smooth and lustrous, widest portion almost in middle. T 2 with median furrow extending to 0.14 of its length. Base of T 2 with two lateral striations on either side of median furrow. T 2 1.41× as long as wide (10.0: 7.1). Pygidium longer than prepygium (2.5: 1.7).

Male. Unknown.

Distribution. China (Yunnan).

Biology. Unknown.

Etymology. The specific name of the new species is referred to its wide head, which is distinctly wider than mesosoma in dorsal view.

Remarks. The new species resembles A. globosa Rajmohana & Narendran, 2006 , but can be distinguished from the latter by following characteristics: antenna filiform (gradually enlarged towards tip in A. globosa ); A3 0.63× scape length (0.45× in A. globosa ); A15 0.61× A3 length (1.50× in A. globosa ); head distinctly transverse and distinctly wider than mesosoma in dorsal view (narrower in A. globosa ); radial cell 2.39× as long as marginal vein (1.50× in A. globosa ); and T 2 with median furrow extending to 0.14 of its length (0.50 in A. globosa ).

Figures

Figures 4–6. Aclista capitata sp. nov., holotype. 4. Antenna. 5. Mesosoma and metasoma, dorsal view. 6. Fore wing.