Aclista annula, 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 : 274-275

Aclista annula sp. nov. ( Figs 1–3 )

Material examined. Holotype ♀, China, Yunnan, Zhaotong, Huanghua , 7–9.X.2012, coll. Shiwen Yang, Sha 3- 201210047 ( SCAU). Paratypes. 3♀, the same data as holotype, Cheng 4-201209007, Hua 3-201210029, Li 3-201210148 ( SCAU) .

Description. Holotype. Female. Body length 3.6 mm. Fore wing length 2.7 mm.

Color. Body blackish-brown. Antennae brown, with A9 and A10 pale yellow. Legs and mandibles brown.

Head. Head in dorsal view 2.10× as wide as long, slightly wider than mesosoma (6.3: 5.7); in frontal view subtriangular, with moderately prominent antennal sockets. Toruli separated from each other, without 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: 6.0: 1.0, 1.3: 1.0, 3.2: 1.0, 2.5: 1.0, 2.0: 1.0, 2.0: 1.0, 2.0: 1.0, 1.5: 1.0, 1.5: 1.0, 1.2: 1.0, 1.0: 1.0, 1.0: 1.0, 1.0: 1.0, 1.0: 1.0, 1.6: 0.9. Ocelli large. OOL: POL=2.5: 2.0. Eye oval, with sparse pubescence, 1.60× as long as wide. Occipital carina complete.

Mesosoma. Mesosoma with dense pubescence. Pronotum broad, with antero-lateral corners angular. 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 of propodeum complete, ending in a prominent dentiform projection. Outer plicae turned outwards posteriorly, ending in a sharp tooth. Fore wing with parastigma 1.54× as long as marginal vein (2.0: 1.3); radial cell closed, 1.75× as long as marginal vein (3.5: 2.0).

Metesoma. Petiole subcylindrical, with distinct longitudinal rugosity; 1.61× as long as middle width (4.5: 2.8). Gaster fusiform, tapering at a sharp point. T 2 smooth and lustrous, widest portion almost in middle. T 2 with median furrow extending to 0.25 of its length. Base of T 2 with two lateral striations on either side of median furrow. T 2 1.54× as long as wide (10.0: 6.5). Pygidium longer than prepygium (3.0: 2.0).

Male. Unknown.

Distribution. China (Yunnan).

Biology. Unknown.

Etymology. The specific name of the new species is referred to the pale yellow annular flagellums (A9 and A10) on the brown antenna.

Remarks. The new species is similar to A. zenobia Buhl, 1998 , but can be distinguished from the latter by following characteristics: antenna brown, with A9 and A10 pale yellow (antenna dark brown, with A8 slightly lighter, A9–A15 pale yellow in A. zenobia ); A1 much longer than A2+A3 (slightly longer in A. zenobia ); A3 3.20× as long as wide (5.00× in A. zenobia ); radial cell 1.75× as long as marginal vein (2.50× in A. zenobia ); and petiole 1.61× as long as middle width (2.30× in A. zenobia ).

Figures

Figures 1–3. Aclista annula sp. nov., holotype. 1. Antenna. 2. Mesosoma and metasoma, dorsal view. 3. Fore wing.