Chelonus (Microchelonus) adiazetos Zhou & Achterberg & Tang & Chen 2024, sp. nov.
Creators: name: Zhou, Jin-Jin
name: Achterberg, Cornelis Van
name: Tang, Pu
name: Chen, Xue-Xin
Publisher: name: Zenodo
Year: 2024
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Hymenoptera
Braconidae
Chelonus
Chelonus adiazetos

description: 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.
description: Published as part of 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, pp. 1-127 in Zootaxa 5412 (1) on pages 15-17, DOI: 10.11646/zootaxa.5412.1.1, http://zenodo.org/record/10675974