Chelonus (Stylochelonus) Hellen 1958
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

description: Subgenus Stylochelonus Hellén, 1958
Diagnosis. Head transverse; antennomeres of both sexes more than 16, often distinctly widened medially in females; eye densely setose; frons and vertex very coarsely rugose; face flat, either striate-rugose or reticulate-rugose; clypeus often finely punctate, with distinct setosity and shiny; mesoscutum and scutellum evenly convex, densely alveolate-rugose; propodeum coarsely rugose; vein 1-SR+M of fore wing absent; hind coxa, femur and apex of tibia distinctly robust; metasomal carapace of male with small apical opening, which may be filled by point-like sclerite; carapace of female usually with an apical tooth; carapace apically usually rounded in dorsal view, rarely narrowed posteriorly.
Biology. Parasitoids of Elachistidae and Tortricidae (Yu et al. 2016).
Distribution. Worldwide (Yu et al. 2016).
Key to species of subgenus Stylochelonus Hellén, 1958
1 Females ............................................................................................. 2
- Males............................................................................................. 14
2 Carapace of female without an apical tooth in dorsal view (Fig. 102E)........................................... 3
- Carapace of female with an apical tooth in dorsal view (Fig. 106E).............................................. 4
3 Temples strongly narrowed behind eyes in dorsal view; head 2.5 × wider than long in dorsal view (Fig. 102G); legs dark (Fig. 101)............................................................................. C. (S.) acaretrus sp. nov.
- Temple almost parallel-sided behind eyes in dorsal view; head 1.6 × wider than long in dorsal view; legs pale...................................................................................... C. (S.) interpositus (Tobias, 1995)
4 Legs pale or yellowish brown (Fig. 105)................................................................... 5
- Legs dark brown or black............................................................................... 9
5 Temples distinctly widened behind eyes in dorsal view; [vein 1-R1 of fore wing shorter than pterostigma]............... 6
- Temples parallel-sided or slightly narrowed behind eyes in dorsal view (Fig. 106G)................................. 7
6 Length of 3 rd antennomere 4.0 × its width; mesosoma 1.3 × longer than high in lateral view................................................................................................. C. (S.) mucronatus (Thomson, 1874)
- Length of 3 rd antennomere 3.0 × its width; mesosoma 1.7 × longer than high in lateral view. C. (S.) pedator (Dahlbom, 1833)
7 Vein 1-R1 of fore wing shorter than pterostigma; vein r of fore wing straight (Fig. 106A)...... C. (S.) punctulosus sp. nov.
- Vein 1-R1 of fore wing as long as or longer than pterostigma; vein r of fore wing curved............................. 8
8 Mesosoma 1.5 × longer than high in lateral view; face 2.0 × wider than high............ C. (S.) pusillus (Szépligeti, 1908)
- Mesosoma 1.7 × longer than high in lateral view; face 1.5 × wider than high............. C. (S.) elachistae (Tobias, 1995)
9 Temples distinctly widened behind eyes in dorsal view....................................................... 10
- Temples parallel-sided or slightly narrowed behind eyes in dorsal view.......................................... 12
10 Vein 1-R1 of fore wing longer than pterostigma; penultimate antennomere shorter than wide.. C. (S.) koponeni (Tobias, 1995)
- Vein 1-R1 of fore wing as long as or shorter than pterostigma; penultimate antennomere as long as wide or longer....... 11
11 Penultimate antennomere as long as wide; antennomeres of female 21–22................ C. (S.) karadagi (Tobias, 1995)
- Penultimate antennomere longer than wide; antennomeres of female 23................ C. (S.) subpedator (Tobias, 1995)
12 Posterior excavation of head deep; antennomeres of female 17; sculpture at base of carapace reticulate-rugose................................................................................ C. (S.) septemdecimplex (Tobias, 1986)
- Posterior excavation of head shallow; antennomeres of female 20; sculpture at base of carapace longitudinally rugose................................................................................ C. (S.) magadani (Tobias, 1994)
14 Carapace of male with an apical tooth in dorsal view (Fig. 108E)......................... C. (S.) punctulosus sp. nov.
- Carapace of male without an apical tooth in dorsal view (Fig. 104E)............................................ 15
15 Fifth-ninth antennomeres of male yellow and more distal antennomeres brown; antenna clearly widened beyond middle (Fig. 104I); [vein r of fore wing slightly curved (Fig. 104A); temples narrowed behind eyes in dorsal view (Fig. 104H)]......................................................................................... C. (S.) acaretrus sp. nov.
- Fifth-ninth antennomeres of male brown or dark brown as more or less distal antennomeres......................... 16
16 Legs pale or yellowish brown........................................................................... 17
- Legs dark brown or black.............................................................................. 19
17 Temples distinctly widened behind eyes in dorsal view; vein 1-R1 of fore wing shorter than pterostigma........................................................................................... C. (S.) pedator (Dahlbom, 1833)
- Temples parallel-sided or slightly narrowed behind eyes in dorsal view; vein 1-R1 of fore wing as long as pterostigma or longer............................................................................................. 18
18 Mesosoma 1.5 × longer than high in lateral view; metasomal carapace 2.0 × longer than wide in dorsal view....................................................................................... C. (S.) interpositus (Tobias, 1995)
- Mesosoma 1.7 × longer than high in lateral view; metasomal carapace 1.8–1.9 × longer than wide in dorsal view.................................................................................... C. (S.) elachistae (Tobias, 1995)
19 Apical aperture of carapace in posterior view large, occupying about 0.3 of carapace width.......................... 20
- Apical aperture of carapace in posterior view occupying 0.1–0.2 of carapace width................................ 21
20 Face narrow, about 1.6 × wider than high; mesosoma 1.5 × longer than high in lateral view.. C. (S.) lissofossa (Tobias, 2000)
- Face about 2.0 × wider than high; mesosoma 1.3 × longer than high in lateral view...... C. (S.) cariniventris (Tobias, 1996)
21 Apical aperture located in upper half of posterior part of metasomal carapace and oblique to horizontal plane; [vein 1-R1 of fore wing shorter than pterostigma; mesosoma 2.0 × longer than high in lateral view]............ C. (S.) elongatus (Papp, 1971)
- Apical aperture located in middle of posterior face of metasomal carapace and in vertical plane...................... 22
22 Vein 1-R1 of fore wing longer than pterostigma; [mesosoma 2.0 × longer than high in lateral view; apical aperture in posterior view occupying about 0.2 of metasomal carapace width].............................. C. (S.) koponeni (Tobias, 1995)
- Vein 1-R1 of fore wing as long as pterostigma or shorter..................................................... 23
23 Vein r of fore wing shorter than vein 3-SR; [antennomeres of male 23; apical aperture in posterior view occupying 0.18–0.23 of metasomal carapace width]................................................... C. (S.) karadagi (Tobias, 1995)
- Vein r of fore wing longer than vein 3-SR................................................................. 24
24 Face about 3.0 × wider than high; [antennomeres of male 25; mesosoma 1.5 × longer than high in lateral view]........................................................................................ C. (S.) clausus (Tobias, 1996)
- Face less than 2.0 × wider than high..................................................................... 25
25 Length of 3 rd antennomere 4.0 × its width; mesosoma 1.3 × longer than high in lateral view................................................................................................. C. (S.) mucronatus (Thomson, 1874)
- Length of 3 rd antennomere less than 3.5 × its width; mesosoma more than 1.5 × longer than high in lateral view......... 26
26 Face 2.0 × wider than high; metasomal carapace 1.8–1.9 × longer than wide in dorsal view..................................................................................................... C. (S.) pusillus (Szépligeti, 1908)
- Face 1.5 × wider than high; metasomal carapace 2.0–2.2 × longer than wide in dorsal view.................................................................................................... C. (S.) subpedator (Tobias, 1995)
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 113-114, DOI: 10.11646/zootaxa.5412.1.1, http://zenodo.org/record/10675974