Aulacocentrum simulatum Long, 2024

Pham, Thi Nhi, Long, Khuat Dang, van Achterberg, Cornelis, Cao, Thi Quynh Nga, Pham, Van Phu & Dang, Thi Hoa, 2024, Revisionary notes on the genus Aulacocentrum Brues (Hymenoptera, Braconidae, Macrocentrinae) from Vietnam, ZooKeys 1197, pp. 13-41 : 13

Aulacocentrum simulatum Long sp. nov.

Figs 11 , 12 , 16

Material.

Holotype, ♀, "Macr. 011 " (IEBR), NC Vietnam: Thua Thien-Hue, A Luoi, A Roang forest , 16°06'36.0"N, 107°24'30.7"E, 700 m, light trap, 7.vi.2006, HV Tru.

Description.

Holotype, female, body length 10.3 mm, fore wing length 7.7 mm, antenna 15.0 mm, ovipositor 8.3 mm (Fig. 11 ).

Head. Antenna incomplete, with 44 flagellomeres remaining, with 13 middle flagellomeres ivory; first flagellomere 1.3 × second one; length of first and second flagellomeres 6.7 and 5.0 × their widths, respectively; length of subapical antennomere 2.7 × its width; in frontal view, width of face 0.9 × its length (Fig. 12B ); length of maxillary palp 1.5 × height of head; face plough, with rather dense punctures; malar space 0.8 × as long as basal width of mandible; clypeus with fine sparse punctures (Fig. 12B ); distance between tentorial pits 2.0 × distance from pit to eye margin; in lateral view, eye 5.3 × temple; in dorsal view, head transverse, 2.3 × as wide as long dorsally (Fig. 12A ); eye 7.0 × as long as temple; ocelli large, OOL: OD: POL = 4: 8: 8 (Fig. 12A ); frons smooth, with median groove; stemmaticum rugose-punctate; vertex and temple punctate.

Mesosoma. Length of mesosoma 1.4 × its height (Fig. 12E ); pronotal trough largely crenulate medially, punctate ventrally, smooth medio-dorsally; propleuron rugose-punctate (Fig. 12E ); middle lobe of mesoscutum mostly rugose-punctate; lateral lobes densely punctate; notauli sparsely punctate anteriorly, converging posteriorly in a V-shaped depression, transverse rugose area separated by median carina-like rugosity (Fig. 12D ); scutellar sulcus deep, with six carinae, 0.5 × as long as scutellum; scutellum densely punctate; mesopleuron and metapleuron largely rugose; propodeum rugose-punctate basally and ventrally; coarsely rugulose medio-posteriorly (Fig. 12C ).

Wings. Length of fore wing 3.2 × its maximum width (Fig. 12F ); pterostigma rather broad, length of pterostigma 3.5 × as long as width medially; fore wing vein SR1 2.5 × as long as vein 3-SR; r: 3-SR: SR1 = 10: 25: 63; vein cu-a vertical; cu-a: 1-CU1: 2-CU1 = 10: 3: 46 (Fig. 12F ); vein r-m oblique; 2-SR: 3-SR: r-m = 17: 25: 9; second submarginal cell of fore wing narrowed apically; hind wing with vein 2-SC+R horizontal (= longitudinal) (Fig. 12G ); vein SC+R1 distinctly bent (Fig. 12G ); cu-a: 1-M: 1r-m = 25: 22: 15; marginal cell of hind wing weakly widened basally, slightly narrowed medially, nearly parallel-sided posteriorly (Fig. 12G ).

Legs. Length of femur, tibia, and basitarsus of hind leg 8.3, 14.3, and 7.7 × their maximum widths, respectively; left hind trochantellus with seven teeth in two rows apically (Fig. 12H ); length of hind inner and outer tibial spurs 0.3 and 0.2 × hind basitarsus, respectively; length of hind basitarsus 0.4 × hind tibia and 1.2 × second-fifth tarsal segments combined.

Metasoma. Length of metasoma 1.3 × head and mesosoma combined; first tergite deeply concave medio-basally (Fig. 12I ), length of first tergite 3.1 × its apical width; median length of second tergite 1.1 × third tergite; first metasomal tergite with transverse striation on most of tergite, irregular striation at apex (Fig. 12I ); second tergite with convergent striation on basal 2/3 of tergite, parallel striation on apical 1/3 of tergite; third tergite with fine parallel striation on basal 4/5 of tergite, apical 1/5 of tergite smooth and sparsely setose; remaining metasomal tergites smooth with sparse setae; length of ovipositor 1.1 × fore wing.

Colour. Head blackish brown; scapus nearly pale yellow entirely, except outer side brownish yellow; flagellum brown basally and apically, 8th-19th middle flagellomeres ivory; palpi yellow; mesonotum dark brown to black; metapleuron, propodeum basally yellow, dark brown apically; fore and middle legs yellow; hind leg yellow, except hind femur apically, hind tibia apically brown; tegula yellow; wing veins brown; wing membrane yellow, parastigma and pterostigma basally yellow; ovipositor sheath brown; ovipositor yellow.

Male. Unknown.

Biology.

Unknown.

Etymology.

From simulo (Latin for "imitate, copy"), because this new species is similar to A. glabrum sp. nov.

Distribution.

NC Vietnam (Thua Thien-Hue province) (Fig. 16 ).

Notes.

The new species is closely related to A. glabrum sp. nov., but differs from the latter by the following characters: 1) hind wing vein cu-a distinctly longer vein 1-M (25: 22) (vein cu-a as long as 1-M in A. glabrum ); 2) left hind trochantellus with six teeth (four teeth in A. glabrum ); 3) marginal cell of hind wing sparsely setose (largely glabrous in A. glabrum ); and 4) first metasomal tergite transversely striate (partly obliquely striate in A. glabrum ).

Newly recorded species

Figures

Figure 11. Habitus of Aulacocentrum simulatum Long, sp. nov., holotype, female, dorsal, " Macr. 011 " (IEBR).

Figure 12. Aulacocentrum simulatum Long, sp. nov., holotype, female, " Macr. 011 " (IEBR) A head, dorsal B head, frontal C propodeum, dorsal D mesonotum E mesopleuron F fore wing G hind wing H hind trochanter, trochantellus and femur I metasoma.

Figure 16. Distribution map of Aulacocentrum species.