Aulacocentrum imparum Long & van Achterberg, 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

publication ID	https://dx.doi.org/10.3897/zookeys.1197.116092
publication LSID	lsid:zoobank.org:pub:E0B01863-8ABD-4D38-945E-ABDB465CE814
persistent identifier	https://treatment.plazi.org/id/3C625000-324F-452E-98A5-3C510B6E3672
taxon LSID	lsid:zoobank.org:act:3C625000-324F-452E-98A5-3C510B6E3672
treatment provided by	ZooKeys by Pensoft
scientific name	Aulacocentrum imparum Long & van Achterberg
status	sp. nov.

Treatment

Aulacocentrum imparum Long & van Achterberg sp. nov.

Figs 5 View Figure 5 , 6 View Figure 6 , 7 View Figure 7 , 8 View Figure 8 , 16 View Figure 16

Material.

Holotype, ♀, "Macr. 172 " (IEBR), NE Vietnam: Tuyen Quang, Lam Binh, Thac Nghien , forest, 22°34.334'N, 105°16.762'E; 114 m, light trap, 21.ix.2017, HTHCT GoogleMaps . Paratype, 1♂, "Macr. 170 " (IEBR), NE Vietnam: topotypic .

Description.

Holotype, female, body length 9.8 mm, fore wing length 7.5 mm, ovipositor sheath 10.5 mm (Fig. 5 View Figure 5 ).

Head. Antenna incomplete, with six flagellomeres remaining; first flagellomere 1.5 × second; length of first and second flagellomeres 6.5 and 4.2 × their widths, respectively; in frontal view, width of face 0.9 × its length (Fig. 6B View Figure 6 ); length of maxillary palp 1.7 × height of head; face densely punctate medially, sparsely punctate laterally (Fig. 6B View Figure 6 ); malar space 1.1 × as long as basal width of mandible; clypeus straight ventrally, sparsely, finely punctate; distance between tentorial pits 1.2 × distance from pit to eye margin; in dorsal view, width of head 2.8 × median length (Fig. 6A View Figure 6 ); eye 9.3 × as long as temple; ocelli medium-sided, OOL: OD: POL = 9: 9: 10 (Fig. 6A View Figure 6 ); frons, vertex and temple smooth.

Mesosoma. Length of mesosoma 1.4 × its height (Fig. 6E View Figure 6 ); pronotal trough largely crenulate medially, mostly smooth ventrally and dorsally; propleuron densely punctate (Fig. 6E View Figure 6 ); middle lobe of mesoscutum rugulose dorsally; punctate ventrally; notauli sparsely crenulate anteriorly, narrowly fused posteriorly with median rugosity (Fig. 6D View Figure 6 ); scutellar sulcus with five median carina, 0.5 × scutellum; scutellum densely punctate; mesopleuron and metapleuron largely rugose-punctate (Fig. 6E View Figure 6 ); propodeum mostly transversely rugulose medially (Fig. 6C View Figure 6 ).

Wings. Length of fore wing 3.0 × its maximum width (Fig. 6I View Figure 6 ); length of pterostigma 3.2 × its width; vein SR1 of fore wing 2.1 × as long as vein 3-SR; r: 3-SR: SR1 = 10: 29: 60; vein 1-SR+M of fore wing angularly bent medially (Fig. 6I View Figure 6 ); cu-a: 1-CU1: 2-CU1 = 14: 4: 60; 2-SR: 3-SR: r-m = 18: 29: 10; second submarginal cell of fore wing narrowed distally; hind wing with vein 2-SC+R quadrate (Fig. 6J View Figure 6 ); vein of hind wing cu-a: 1-M: 1r-m = 15: 13: 10; marginal cell sparsely setose, slightly widened apically.

Legs. Hind coxa densely setose latero-ventrally, densely punctate dorsally, with fine oblique striation apically (Fig. 6G View Figure 6 ); length of femur, tibia, and basitarsus of hind leg 8.4, 16.4, and 8.0 × their maximum widths, respectively; left hind trochantellus with three teeth apically; length of hind inner and outer tibial spurs 0.4 × and 0.3 × hind basitarsus, respectively; length of hind basitarsus 0.3 × hind tibia and 1.3 × second-fifth tarsal segments combined.

Metasoma. Length of metasoma 1.4 × head and mesosoma combined; first tergite slightly concave medio-basally (Fig. 6F View Figure 6 ), length of first tergite 3.8 × its apical width; laterope large (Fig. 6H View Figure 6 ); second tergite slightly longer than third tergite medially; first metasomal tergite mostly transversely striate; second tergite weakly constricted medio-laterally, with convergent striae on basal 2/3 of tergite, parallel striation on apical third of tergite (Fig. 6F View Figure 6 ); third tergite finely striate on basal 2/3 of tergite; remaining metasomal tergites coriaceous, with dense setae (Fig. 6F View Figure 6 ); length of ovipositor 1.4 × fore wing.

Colour. Head and mesosoma black; scapus pale yellow, brown dorsally; palpi yellow; fore leg pale yellow, except fore tarsus brownish yellow; middle leg yellow, except middle tarsus brownish yellow; hind coxa brownish yellow, trochanter and trochantellus; hind femur blackish brown, yellow at extreme base; hind tibia blackish brown apically, cream-white basally; hind tibial spurs and tarsus cream-white; tegula cream-white; wing veins brown; parastigma yellow; pterostigma brown, yellow basally and apically; wing membrane hyaline; basal 1/2 of first metasomal tergite pale yellow; apical 1/2 of first tergite and second tergite black; basal 2/3 of third tergite pale yellow, apical 1/3 black; first-third sternites pale yellow and remainder black; ovipositor sheath brown; ovipositor yellow.

Variation male.

Paratype, "Macr. 170 " (IEBR), body length 7.5 mm, fore wing length 5.5 mm (Fig. 7 View Figure 7 ).

Head. Antenna with 41 flagellomeres; first flagellomere 1.3 × second; length of first and second flagellomeres 6.7 and 5.0 × their widths, respectively; in frontal view, width of face 0.9 × its length (Fig. 8B View Figure 8 ); length of maxillary palp 1.4 × height of head; face densely punctate medially, sparsely punctate laterally (Fig. 8B View Figure 8 ); malar space 1.1 × as long as basal width of mandible; clypeus weakly convex in lateral view (Fig. 8C View Figure 8 ); straight ventrally, sparsely punctate; distance between tentorial pits 1.4 × distance from pit to eye margin; in dorsal view, width of head 2.7 × median length; eye 7.7 × as long as temple; OOL: OD: POL = 6: 6: 9 (Fig. 8A View Figure 8 ); frons, vertex and temple coriaceous.

Mesosoma. Length of mesosoma 1.5 × its height; pronotal trough largely crenulate medially, mostly smooth ventrally and dorsally; propleuron rugose-punctate (Fig. 8E View Figure 8 ); notauli sparsely crenulate anteriorly, narrowly fused posteriorly with median rugosity (Fig. 8D View Figure 8 ); middle lobe of mesoscutum rugulose dorsally; punctate ventrally; median lobes of mesoscutum sparsely punctate; scutellar sulcus 0.4 × scutellum, with one median carina; scutellum densely punctate; mesopleuron rugose-punctate medially, densely punctate ventrally (Fig. 8E View Figure 8 ); metapleuron rugose-punctate; propodeum mostly transversely rugulose medially.

Wings. Length of fore wing 3.5 × its maximum width (Fig. 8F View Figure 8 ); length of pterostigma 4.8 × its width; vein SR1 of fore wing 2.1 × as long as vein 3-SR; r: 3-SR: SR1 = 10: 25: 52; vein 1-SR+M of fore wing angularly bent medially (Fig. 8F View Figure 8 ); cu-a: 1-CU1: 2-CU1 = 6: 3: 37; 2-SR: 3-SR: r-m = 14: 25: 10; second submarginal cell of fore wing narrowed distally; hind wing vein 2-SC+R quadrate (Fig. 8H View Figure 8 ); vein of hind wing cu-a: 1-M: 1r-m = 16: 12: 10; marginal cell sparsely setose.

Legs. Hind coxa with discrete punctures dorsally, distinctly depressed dorso-apically and mostly smooth (Fig. 8G View Figure 8 ); length of femur, tibia, and basitarsus of hind leg 8.5, 16.8, and 9.0 × their maximum widths, respectively; left hind trochantellus with three teeth apically; length of hind inner and outer tibial spurs 0.4 × and 0.3 × hind basitarsus, respectively; length of hind basitarsus 0.4 × hind tibia and 1.2 × second-fifth tarsal segments combined.

Metasoma. Length of metasoma 1.5 × head and mesosoma combined; first metasomal tergite parallel-sided, with deep medio-basal depression (Fig. 8I View Figure 8 ), length 4.0 × its apical width; second tergite 1.2 × third tergite medially; first metasomal tergite mostly transversely striate; second tergite with convergent striae on basal 2/3 of the tergite, parallel striation on apical 1/3 of tergite (Fig. 8I View Figure 8 ); third tergite finely striate on basal 2/3 of tergite; remaining metasomal tergites coriaceous, with dense setae.

Colour. Head black; scapus whitish yellow, brown dorsally; palpi whitish yellow; antenna brown basally and apically, with 11th-19th flagellomeres ivory; pronotum whitish yellow; mesoscutum blackish brown to black; mesopleuron tricoloured, dark brown dorso-anteriorly, brown ventrally and yellow posteriorly; metapleuron entirely yellow (Fig. 8E View Figure 8 ); propodeum dark brown posteriorly, yellow anteriorly and laterally; fore and middle legs pale yellow; hind coxa reddish yellow (Fig. 8G View Figure 8 ); trochanter and trochantellus pale yellow; hind femur dark brown, yellow basally; hind tibia blackish brown in apical 3/4 of the tibia, cream-white in basal 1/4; hind tibial spurs and tarsus cream-white; tegula cream-white; wing veins brown; vein 1-R1 and parastigma yellow; pterostigma brown, yellow basally; wing membrane hyaline; basal 1/3 of first metasomal tergite pale yellow; apical 1/2 of first tergite and second tergite blackish brown; basal 2/3 of third tergite yellow, apical 1/3 brown; its remainder black.

Biology.

Unknown.

Etymology.

From impar Latin for unequal, odd, different, because in both sexes, left fore wing with vein 1-SR+M angularly bent medially.

Distribution.

NE Vietnam (Tuyen Quang province) (Fig. 16 View Figure 16 ).

Notes.

This new species (both sexes) is closely related to A. philippinense (Ashmead) but can be separated from the latter by the following characters: 1) first metasomal tergite with basal depression (vs flat in A. philippinense ); 2) second metasomal tergite (female) weakly constricted medio-laterally (vs distinctly constricted medio-laterally in A. philippinense ); 3) OOL equal to OD; stemmaticum coriaceous (OOL slightly longer than OD, and stemmaticum rugulose in A. philippinense ) and 4) vein 1-SR+M of fore wing angularly bent medially (vs evenly curved in A. philippinense ).