Chelonus (Arichelonus) kenosetrus, Zhou & Achterberg & Tang & Chen, 2022

Zhou, Jin-Jin, Achterberg, Kees Van, Tang, Pu & Chen, Xue-Xin, 2022, A review of the subgenera Arichelonus, Megachelonus and Scabrichelonus of the genus Chelonus Panzer (Braconidae: Cheloninae) with description of five new species from China, Zootaxa 5165 (4), pp. 527-547 : 531-533

Chelonus (Arichelonus) kenosetrus sp. nov.

Figs 3–4

Material examined. Holotype: female, China, Zhejiang Prov., Deqing , 27.V.1995, Junhua He, No. 965092 ( ZJUH) ; Paratypes, 2 females, Deqing, Zhejiang province, 27.V.1995, Junhua He , Nos. 954349, 954350 .

Diagnosis. This new species is similar to C. (A.) olgae Kokujev, 1895 , but can be separated from the latter by the following characters: ovipositor obviously extended beyond apex of metasomal carapace and covered with a semi-round and semi-hyaline lamella (the ovipositor not or weakly projecting beyond apex of metasoma in C. (A.) olgae Kokujev, 1895 ); metasoma entirely brown (metasoma with pair of yellow basal spots); about 22 antennomeres of female, distinctly shorter than body length (antennomeres of female about 45, equal to body length).

Description. Holotype, female, length of body 4.6 mm, of fore wing 3.3 mm.

Head. Antennomeres 22 ( Fig. 4I ); third antennomere 1.1 × longer than fourth; third, fourth and terminal antennomeres 4.0 ×, 3.5 × and 1.75 × longer than wide; head transverse, in dorsal view roundly contracted behind eyes; OOL: OD: POL=19: 15: 9; longitudinal diameter of eye 2.1 × height of temples; vertex behind ocelli and temple transversely striate; frons distinctly concave ( Fig. 4G ); face evenly convex, coarsely transversely striate; clypeus hardly convex and densely punctate, slightly shiny; length of malar space 1.5 × basal width of mandible ( Fig. 4F ); face and eyes densely setose in lateral view ( Fig. 4H ).

Mesosoma. Length of mesosoma 1.3 × its height; mesonotum evenly convex, irregular areolate-rugose and more strongly rugose postero-medially; scutellum hardly convex, punctate medially, rugose laterally; scutellar suture comparatively deep; propodeum coarsely reticulaterugose ( Fig. 4C ); mesopleuron evenly convex, coarsely reticulate-rugose ( Fig. 4B ).

Wings. Length of fore wing 2.9 × its width; length of marginal cell 1.3 × pterostigma; r: 3-SR: SRl= 9: 9: 43; SRl straight; parastigma distinctly swollen; 1-CU1: 2-CU1= 10: 27 ( Fig. 4A ).

Legs. Hind coxa completely smooth and punctate; hind femur pretty robust; length of hind femur, tibia and basitarsus 3.1 ×, 5.2 × and 4.75 × their maximum width, respectively.

Metasoma. Carapace elongate-oval, a narrow lamella dorsally of apical carapace in dorsal view, posterior part of carapace with transversely curved deepened furrow; length of carapace 2.6 × its maximum width in dorsal view ( Fig. 4D ); ventral cavity completely open to apex; ovipositor extended beyond apex of metasomal carapace and covered with a semi-round and semi-hyaline short lamella, ovipositor slender and the ovipositor sheath 0.11 × as long as fore wing, 0.32 × as long as hind tibia ( Fig. 4E ).

Colour. Black; antennomeres blackish-brown; pterostigma and veins blackish-brown; fore wing more or less darkened; metasoma entirely brown; legs almost entirely yellowish-brown; ovipositor sheath brown.

Variation. Body length 3.7–4.6 mm, and length of ovipositor 0.2–0.4 × of carapace length.

Male. Unknown.

Biology. Unknown.

Etymology. From kenos (Greek for empty) and etron (Greek for belly) because its ventral cavity completely open to the apex.

Figures

FIGURE 3. Chelonus (Arichelonus) kenosetrus sp. nov., female, holotype, habitus, lateral aspect.

FIGURE 4. Chelonus (Arichelonus) kenosetrus sp. nov., female, holotype. A, fore wing; B, mesosoma, lateral aspect; C, mesosoma, dorsal aspect; D, metasoma, dorsal aspect; E, metasoma, lateral aspect; F, head, anterior aspect; G, head, dorsal aspect; H, head, lateral aspect; I, antenna.