Drepanoctonus rimdahli Liu & Reshchikov, 2021

Zheng, Xin-Fang, Reshchikov, Alexey & Liu, Jing-Xian, 2021, Two new species of Drepanoctonus Pfankuch, 1911 (Hymenoptera, Ichneumonidae) from the Oriental region, Journal of Hymenoptera Research 83, pp. 1-19 : 1

Drepanoctonus rimdahli Liu & Reshchikov sp. nov.

Figs 6 , 7

Materials examined.

Holotype, female, Thailand: Chiang Mai, Mae Taeng, Pa Pae , 19°14'30.6"N, 98°30'14.1"E, old forest with C. sinensis assamica , Malaise trap (Dara#1), 04.V-25.V.2017, Monsoon Tea leg. (NHRS), DNA voucher, SCAU3013719, GenBank number: MW528534 ; Paratypes, 1 female, the same locality as holotype, Malaise trap (Dara#1), 12 Apr. - 03 May 2017, Monsoon Tea leg., DNA voucher, SCAU 3013713, GenBank number: MW528533 , (QSBG) ; 1 male, the same locality as holotype, Malaise trap (Dara#1), 12 Apr. - 03 May 2017, Monsoon Tea leg., DNA voucher, SCAU 3013712, GenBank number: MW528532 (QSBG) .

Description.

Holotype. Female, fore wing length 7.5 mm, body length 9.0 mm (Fig. 6A, B ).

Head. Combined face and clypeus weakly convex, 0.80-0.90 × as wide as high, densely and evenly punctate, lateral corner of clypeus weakly wrinkled (Fig. 7A ); upper margin of face not produced medially as an acute triangle between bases of antennae. Lateral and posterior margins of antennal sockets developed into a low flange with weak earlike dorsolateral projections. Inner orbits of eye weakly concave above antennal sockets. Vertex strongly vertical behind posterior ocelli, with minute punctures, densely setose. POL:OD:OOL=2:1.2:1. Temple strongly narrowed behind eyes in dorsal view (Fig. 7C ), densely setose. Occipital carina complete and sharp. Antenna with 37 flagellomeres, first flagellomere 2.9 × as long as its posterior width, 1.5 × as long as the second flagellomere, ventral side of 9th flagellomere to apex flattened, with sensilla plates.

Mesosoma. Pronotum with upper lateral corner finely punctate and densely setose, lower part polished with a row of transverse depressions. Epomia strong, reaching to upper 0.8 of pronotum. Mesoscutum with minute punctures, distance between punctures 0.5-1.0 × the diameter of a puncture (Fig. 7D ). Notaulus absent. Scutellum scattered with sparse punctures, lateral carina sharp, reaching to 0.6 of scutellum (Fig. 7B ). Mesopleuron (Fig. 7E ) strongly convex, with moderately dense minute punctures, separated from each other by 1.0-2.0 × the diameter of a puncture; epicnemial carina with dorsal end far from the front edge of mesopleuron; speculum very small; mesopleural furrow weakly foveolate. Metapleuron (Fig. 7E ) moderately convex, upper 2/3 with sparse minute punctures, anterior lower 1/3 with scattered, weak wrinkles, juxtacoxal carina incomplete, with only basal 0.6 present; submetapleural carina complete. Propodeum short, latero-median longitudinal carinae complete and gradually convergent from base to middle; area superomedia polished and glabrous, closed posteriorly; posterior transverse carina complete (Fig. 7B ); dorsal lateral areas of propodeum densely setose, with minute punctures; pleural carina strong and complete; pleural area weakly rugose-punctate, densely setose. Spiracle elongate, 2.0 × as long as its median width, connected with pleural carina by a short carina.

Wings. Fore wing with 1cu-a distad of M&Rs by 0.5 × the length of 1cu-a, 2rs-m slightly reclivous, very slightly anterior of 2m-cu. Hind wing with Cu & cu-a interrupted on lower 0.4, distal abscissa of Cu distinct.

Legs. Mid tibial spurs equal in length and 0.63 × the length of 1st segment of hind tarsus. Hind femur 4.0 × as long as its maximum width (Fig. 7G ); hind tibia 0.53 × as long as its maximum width, with several bristles on posterior half, longest tibial spur 0.88 × the length of 1st segment of hind tarsus. Ratio of segments of hind tarsus: 38:20:14:8:14.

Metasoma. T1 1.25 × as long as its posterior width, latero-median longitudinal carinae weak but forming a longitudinal convex area, lateral area of T1 subpolished, with sparse minute punctures, dorsolateral carina complete and sharp (Fig. 7F ). T2 moderately densely punctate, 0.83 × as long as its apical width, without distinct carinae, but anteriorly and centrally with a pair of short stubs (Fig. 7F ). T3 strongly punctate without any carinae (Fig. 7F ). T4 with dense minute punctures, anterior 0.3 centrally with some short longitudinal wrinkles. T5 finely punctate. T6 polished, with sparse and minute punctures. Ovipositor 1.2 × as long as 1st segment of hind tarsus, ventral valve with its anterior 0.3 weakly swollen.

Colour. Body with whitish setae. Head black (Fig. 7A, C ). Antenna blackish-brown, scape whitish with lateral black marks. Pronotum with upper part dark reddish-brown, lower part black; mesoscutum black with anterior lateral corners dark reddish-brown; scutellum yellowish-white with a round black spot in anterior half; mesopleuron with upper 2/3 dark reddish-brown and lower 1/3 black, epicnemium black with upper 0.2 dark reddish-brown; subtegular ridge yellowish-white; metapleuron with upper half dark reddish-brown and lower half black; propodeum black. Metasoma reddish-brown, T1 yellowish-white with anterior 0.3 black and a longitudinal black stripe between mediodorsal carinae. T2 reddish brown with anterior corners black and posterior lateral corners yellowish-brown. Fore coxa and trochanter black with anterior side yellowish-white, fore femur brown with anterior side and apex yellowish-white, fore tibia yellowish-white, fore tarsus yellowish-brown; mid coxa black with anterior side yellowish-white, mid trochanter brown with anterior side white, mid femur brown, ventrally blackish-brown, apex of femur yellowish-white, mid tibia brown, with a sub-basal yellowish-white band, posterior 0.5 with outer margin blackish-brown, mid tarsus dark brown; hind coxa black with apex reddish-brown, hind trochanter yellowish-brown, hind femur reddish-brown, hind tibia brown with a sub-basal whitish band, hind tarsus blackish brown, hind tibial spur yellowish-white. Wings hyaline, tegula yellowish-white.

Male. (Fig. 6C ) Similar to female. Fore wing length 6.5 mm, body length 8.5 mm. Combined face and clypeus moderately densely punctate, 3/4 as wide as high; POL:OD:OOL=3.5:2.25:1. Antenna with 38 flagellomeres, first flagellomere 2.6 × as long as its posterior width, 1.5 × as long as the second flagellomere. Hind femur 3.9 × as long as its maximum width, longer spur of hind tibia 2/3 as long as 1st segment of hind tarsus. Ratio of segments of hind tarsus: 30:15:10:5:10. Head and mesosoma black. Antenna blackish-brown, scape yellowish-white with lateral blackish-brown marks. Metasoma reddish-brown, first tergite yellowish-brown, anterior 0.2 black, centrally with a longitudinal blackish-brown band between the latero-median longitudinal carinae. Tegula and subtegular ridge yellowish brown. All coxae black; fore trochanter blackish-brown, fore femur dark brown, fore tibia and tarsus yellowish-white. Mid trochanter brown with posterior half yellowish-white, mid femur brown, mid tibia brown with a sub-basal white band, mid tarsus yellowish-white. Hind leg brown, hind trochanter yellowish-white, hind tibia with a sub-basal whitish band, 1st segment of hind tarsus blackish brown. Wings hyaline, veins and pterostigma blackish-brown.

Variation.

T2 of a female paratype, with a pair of short carinae on anterior 0.4 of tergite. Pronotum largely black with upper margin tinged with indistinct dark reddish-brown. Mesopleuron weakly marked with dark reddish-brown.

Distribution.

Thailand (Chiang Mai).

Comments.

This species can be separated from other species of the genus by the following combined characters: the upper margin of face not produced medially as an acute triangle between bases of antennae (Fig. 7A ), T2 centrally with a pair of short stubs anteriorly, T3 and following tergites without carina (Fig. 7F ).

Etymology.

The species is named after Mr. Kenneth Rimdahl, the founder of Monsoon Tea, in recognition of his efforts in saving Thai forests.

Figures

Figure 6. Drepanoctonus rimdahli Liu & Reshchikov, sp. nov., female, holotype A habitus, dorsal view B habitus, lateral view C male paratype, lateral view.

Figure 7. Drepanoctonus rimdahli Liu & Reshchikov, sp. nov., female, holotype A face B propodeum, dorsally C head, dorsally D mesoscutum E mesopleuron F T 1 - T 4, dorsally G hind leg, laterally.