Chelonus (Stylochelonus) acaretrus 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 acaretrus

description: Chelonus (Stylochelonus) acaretrus sp. nov.
Figs 101–104
Material examined. Holotype: female, Gutian Mt., Zhejiang Prov., China, 3.VII.2005, Hongying Zhang, No. 200602221 (ZJUH). Paratypes: 1 female, Shenyang, Liaoning Prov., China, 10.VII.1994, Juxian Lou, No. 947173; 1 male, Dongliao, Jilin Prov., China, 22–31.VII.1988, Xiaoming Lou, No. 888131; 1 female, Lao Mt., Shandong Prov., China, 4.VIII.1995, Junhua He, No. 955892; 1 male, Baotianman, Henan Prov., China, 13–15.VII.1998, Xuexin Chen, No. 991789; 2 females, Qingchen Mt., Sichuan Prov., China, 19.VII.2006, Zhilei Gao, Nos. 200610765, 200610766; 1 female, Longxi Mt., Fujian Prov., China, 8.VII.1991, Changming Liu, No. 969745; 1 male, Xiangtuo Mt., Guangdong Prov., China, 11. V.2004, Zaifu Xu, No. 20048091; 2 females and males, Longsheng Huaping, Guangxi Prov., China, 25–26. VI.1982, Junhua He, Nos. 23608, 82382, 822028, 823067; 1 male, Bawang Ling, Hainan Prov., China, 20–23.VIII.2005, Jinxian Liu, No. 200702347.
Diagnosis. This new species is similar to C. (S.) pedator (Dahlbom, 1833), both species having the metasomal carapace very short, but they can be separated by the following characters: temples strongly narrowed posteriorly behind eyes in dorsal view (Fig. 102G) (versus strongly widened in C. (S.) predator); metasomal carapace widest at middle (Fig. 102E) (versus tapering towards base) and face 1.9 × wider than high (Fig. 102F) (versus 1.5 ×).
Description. Holotype, female, length of body 2.9 mm, of fore wing 2.7 mm.
Head. Head transverse, width of head 2.5 × its dorsal length; occiput slightly excavated; antennomeres 22, filiform, antenna slightly widened after middle, length of 3 rd and penultimate antennomeres 3.9 × and 2.2 × their width, respectively; eye 1.5 × as long as temple in dorsal view; OOL: OD: POL=19: 7: 11; temple strongly narrowed behind eyes; frons and vertex striate-rugulose (Fig. 102G); face flat, transverse punctate-rugose, width of face 1.9 × its height; eyes about parallel; clypeus sparsely punctulate, interspaces shiny, 2.2 × wider than high, distance between tentorial pits 1.2 × distance between pits and eyes (Fig. 102F).
Mesosoma. Length of mesosoma 1.3 × its height; side of pronotum reticulate-rugose, mesopleuron coarsely reticulate-rugose (Fig. 102B); notauli indistinct; anterior part of mesoscutum dense punctate and posterior part coarsely reticulate-rugose, scutellum slightly convex, rugose; scutellar suture comparatively deep and with carinae; propodeum coarsely rugose, tubercles distinct (Fig. 102C).
Wings. Vein r straight; marginal cell 0.9 × as long as pterostigma; pterostigma 3.5 × longer than wide; r: 3-SR: SR1=14: 11: 62; SR1 straight; marginal cell 2.8 × longer than second submarginal cell; 1-CU1: 2-CU1=15: 29; 2-R1 absent (Fig. 102A).
Legs. Hind coxa smooth and shiny; length of hind femur, tibia and basitarsus 3.0 ×, 4.9 × 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, widest at middle, apex of carapace with small tubercle; basal 0.7 of carapace striate-rugose and reticulate-rugose apically (Fig. 102E); carapace in lateral view 2.4 × longer than high, posterior height of metasoma 1.5 × its anterior height, carapace apically slightly incurved (Fig. 102D).
Colour. Reddish brown; antenna brown; mandible light brown; palpi light brown; pterostigma and parastigma dark brown; wing and its veins medium light brown; legs partly brown; carapace entirely black.
Male. Antennomeres 27, antenna clearly widened medially, antenna three coloured, 3 rd –5 th antennomeres light brown, 6 th –9 th yellowish and remainder of antennomeres brown (Fig. 104I); carapace apically almost not incurved (Fig. 104D); apical aperture in posterior view small and nearly round (Fig. 104F); carapace with yellowish band in basal 1/3; other characters as in female (Fig. 104E).
Biology. Unknown.
Distribution. China (Fujian, Guangdong, Guangxi, Hainan, Henan, Jilin, Liaoning, Shandong, Sichuan, Zhejiang).
Etymology. Named after its short metasomal carapace, “ acares ” is Greek for short and “ etrom ” is Greek for belly.
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 116-118, DOI: 10.11646/zootaxa.5412.1.1, http://zenodo.org/record/10675974