Chelonus (Microchelonus) adiazetos, Zhou & Achterberg & Tang & Chen, 2024

Zhou, Jin-Jin, Achterberg, Cornelis Van, Tang, Pu & Chen, Xue-Xin, 2024, A review of the subgenera Carinichelonus, Microchelonus, Parachelonus and Stylochelonus of the genus Chelonus Panzer (Braconidae: Cheloninae) with descriptions of twenty-one new species from China, Zootaxa 5412 (1), pp. 1-127 : 15-17

Chelonus (Microchelonus) adiazetos sp. nov.

Figs 5–6

Material examined. Holotype: female, Tianmu Mt. , Zhejiang Prov., China, 29.VII.1984, Xiaojin Wu, No. 844305 ( ZJUH) . Paratype: 1 female, Tianmu Mt. , Zhejiang Prov., China, 18.VIII.1999, Xiaojin Wu, No. 997801 .

Diagnosis. This new species is similar to C. (M.) indericus ( Tobias, 2003) , both having the metasomal carapace widest at middle and with the same length: width ratio, body black and most of legs yellowish brown, but the two species can be separated by the following characters: apex of metasomal carapace distinctly incurved ( Fig. 6D ) (versus slightly incurved in C. (M.) indericus ); hind femur 2.7 × longer than wide (versus 1.7 ×); length of 3 rd antennomere 2.2 × longer than wide ( Fig. 6H ) (versus 3.0 ×).

Description. Holotype, female, length of body 3.1 mm, of fore wing 2.4 mm.

Head. Head transverse, width of head 1.8 × its dorsal length, occiput hardly excavated; antennomeres 16, antenna filiform, slightly widened after middle, length of 3 rd and penultimate antennomeres 2.2 × and 1.5 × their width, respectively ( Fig. 6H ); eye in dorsal view 2.1 × longer than temple; OOL: OD: POL=17: 6: 13; temple narrowed behind eyes; frons and vertex very coarsely transverse-rugose ( Fig. 6G ); face flat, concentric reticulate-rugose, width of face 1.9 × its height; eyes about parallel; clypeus densely punctate, interspaces shiny, clypeus 2.1 × wider than high, apical margin truncate medially, shiny; distance between tentorial pits 1.7 × distance between pits and eyes ( Fig. 6F ).

Mesosoma. Length of mesosoma 1.4 × its height; side of pronotum finely punctate, mesopleuron reticulate-rugose ( Fig. 6B ); notauli slightly impressed, mesoscutum uniformly and entirely coarsely reticulate-rugose; scutellum evenly convex, rugose; scutellar suture comparatively deep, narrow, with carinae; propodeum coarsely rugose, tubercles small and weak ( Fig. 6C ).

Wings. Vein r slightly arched; marginal cell 0.9 × as long as pterostigma; pterostigma 3.4 × longer than wide; r: 3-SR: SR1=12: 14: 51; SR1 slightly sinuate; marginal cell 2.7 × longer than second submarginal cell; 1-CU1: 2- CU1=13: 24; 2-R1 absent ( Fig. 6A ).

Legs. Hind coxa mainly smooth, shiny and setose; length of hind femur, tibia and basitarsus 2.7 ×, 3.9 × and 3.6 × their maximum width, respectively; length of inner hind tibial spur 0.5 × hind basitarsus.

Metasoma. Length of carapace 1.7 × its maximum width in dorsal view, widest at middle, apically rounded; carapace irregularly reticulate-rugose up to middle, rugose apically ( Fig. 6E ); length of carapace in lateral view 2.7 × its height, posterior height of metasoma 1.5 × its anterior height ( Fig. 6D ); carapace apically distinctly incurved.

Colour. Black; antenna brown but scapus yellowish; mandibles light brown but tip darkened; palpi light brown; pterostigma brown; middle of wing and its veins dark brown, wing base and its veins light brown; legs almost entirely yellow but hind coxa, femur and apex of tibia black; basal 1/3 of carapace with yellowish regular-edged band.

Male. Unknown.

Biology. Unknown.

Distribution. China (Zhejiang).

Etymology. Named “ adiazetos ” (Greek for unpolished) because the frons and vertex are very coarsely transverse-rugose.

Figures

FIGURE 5. Chelonus (Microchelonus) adiazetos sp. nov., female, holotype, habitus, lateral aspect.

FIGURE 6. Chelonus (Microchelonus) adiazetos sp. nov., female, holotype. A, fore wing; B, mesosoma, lateral aspect; C, mesosoma, dorsal aspect; D, metasoma, lateral aspect; E, metasoma, dorsal aspect; F, head, anterior aspect; G, head, dorsal aspect; H, antenna; I, head, lateral aspect.