Trachyusa Ruthe, 1854

Zhu, Jiachen, Achterberg, Cornelis Van & Chen, Xuexin, 2025, A revision of five genera of Alysiini (Hymenoptera, Braconidae, Alysiinae) from China, with description of five new species, Zootaxa 5569 (3), pp. 401-438 : 413

publication ID	https://doi.org/10.11646/zootaxa.5569.3.1
publication LSID	lsid:zoobank.org:pub:2D59C36A-D41C-42B6-8380-FEB68A28DE9B
DOI	https://doi.org/10.5281/zenodo.14754712
persistent identifier	https://treatment.plazi.org/id/9A1887C1-FFEA-FFB7-FF2F-3B899CDD8C3B
treatment provided by	Plazi
scientific name	Trachyusa Ruthe
status

Treatment

Key to species of the genus Trachyusa Ruthe View in CoL View at ENA

1 Body slender in lateral view ( Figs 9 View FIGURE 9 , 11 View FIGURE 11 , 13 View FIGURE 13 , 15 View FIGURE 15 ); mesoscutum in dorsal view longer than its maximum width ( Figs 10D View FIGURE 10 , 12D View FIGURE 12 , 14D View FIGURE 14 , 16C View FIGURE 16 ); antenna longer than body length................................................................ 2

- Body stout in lateral view; mesoscutum in dorsal view shorter than wide; antenna as long as or shorter than body length... 7

2 Mesoscutum with conspicuous long setae and anteriorly near notauli with some distinct punctures ( Fig. 10D View FIGURE 10 ); head less transverse in dorsal view, 1.5–1.7 × wider than long medially ( Fig. 10I View FIGURE 10 ); pterostigma of ♀ less robust, vein r 0.4–0.5 × as long as maximum width of pterostigma ( Fig. 10A View FIGURE 10 ); China (Shaanxi, Zhejiang)........................ T. punctata sp. nov.

- Mesoscutum only with medium-sized setae medio-anteriorly and anteriorly near notauli smooth; head usually distinctly transverse (except in T. aurora ), 1.7–2.2 × wider than long medially ( Figs 12I View FIGURE 12 , 14I View FIGURE 14 , 16H View FIGURE 16 ); if 1.5–1.7 × then pterostigma of ♀ robust, vein r 0.2–0.3 × as long as its maximum width........................................................ 3

3 Head less transverse in dorsal view, 1.5–1.7 × wider than long medially; with some indistinct granulation near notauli; vein m-cu of fore wing interstitial or nearly so; [NW European T. nigrothoracica van Achterberg & O’Connor, 1990 View in CoL , is provisionally considered to be a melanistic form of T. aurora ]; Europe, East Palaearctic (Far East Russia, Korea)................................................................................................... T. aurora ( Haliday, 1838)

- Head more transverse, 1.7–2.2 × wider than long medially ( Figs 12I View FIGURE 12 , 14I View FIGURE 14 , 16H View FIGURE 16 ); area near notauli smooth; vein m- cu of fore wing antefurcal or postfurcal ( Figs 12A View FIGURE 12 , 14A View FIGURE 14 , 16H View FIGURE 16 ).......................................................... 4

4 Notauli smooth and almost reaching middle of mesoscutum ( Fig. 12D View FIGURE 12 ), medio-posterior depression short and shallow ( Fig. 12D View FIGURE 12 ); [precoxal sulcus short, reduced near posterior edge of mesopleuron ( Fig. 12C View FIGURE 12 )]; China (Guizhou)................................................................................................. T. microporosa sp. nov.

- Notauli distinctly sculptured, at least so anteriorly ( Fig. 14D View FIGURE 14 ); if sculpture of notauli reduced then medio-posterior depression long and posteriorly rather deep......................................................................... 5

5 Medio-posterior depression of mesoscutum short; precoxal sulcus long, wide and distinctly developed near posterior edge of mesopleuron; vein m-cu of fore wing slightly postfurcal; East Palaearctic (Far East Russia)... T. indrik Belokobylskij, 1998 View in CoL

- Medio-posterior depression of mesoscutum long ( Fig. 14D View FIGURE 14 ); precoxal sulcus short, absent near posterior edge of mesopleuron ( Fig. 14C View FIGURE 14 ); vein m-cu of fore wing slightly antefurcal ( Fig. 14A View FIGURE 14 )............................................... 6

6 Mesosoma and metasoma black or dark reddish brown ( Figs 14D–F View FIGURE 14 ); pterostigma of ♂ (compared to ♀) strongly widened; first flagellomere 3.5–4.3 × longer than its apical width ( Fig. 14H View FIGURE 14 ); hind coxa more or less sculptured ( Figs 14C View FIGURE 14 ); notauli narrowly sculptured ( Figs 14D View FIGURE 14 ); [head 1.7–1.9 × wider than long medially]; Russia ( Far East ), China (Guizhou, Shaanxi)..................................................................................... T. vasilisk Belokobylskij, 1998 View in CoL

- Mesosoma and metasoma brownish yellow ( Figs 16C–E View FIGURE 16 ), but apex of metasoma and propodeum (especially of ♂) more or less darkened; pterostigma of ♂ (compared to ♀) moderately widened; first flagellomere 4.5–5.8 × longer than its apical width ( Fig. 16G View FIGURE 16 ); hind coxa smooth ( Fig. 15 View FIGURE 15 ); notauli often more extensively sculptured ( Fig. 16C View FIGURE 16 ); [head 1.7–2.3 × wider than long medially]; China (Guizhou, Hebei, Liaoning, Shaanxi, Zhejiang)............................. T. whartoni Yao, 2015

7 Notauli on posterior half of mesoscutal disc deeply impressed; mesoscutum black; first metasomal tergite usually slenderer ( Fig. 15 View FIGURE 15 in van Achterberg & O’Connor 1990); Central Europe.............................. T. szepligetii Papp, 1967 View in CoL

- Notauli on posterior half of mesoscutal disc at most shallowly impressed; mesoscutum brownish yellow; first tergite rather robust ( Fig. 14 View FIGURE 14 in van Achterberg & O’Connor 1990); Central Europe....................... T. bucephala Papp, 1967 View in CoL