Blacus (Blacus) tianmushanensis, Lu & Chai & Achterberg & Tang & Chen, 2024

Lu, Qian-Yu, Chai, Hong-Fei, Achterberg, Cornelis Van, Tang, Pu & Chen, Xue-Xin, 2024, The first report of subgenus Blacus Nees, 1819 (Hymenoptera, Braconidae, Brachistinae) from China, Zootaxa 5471 (5), pp. 501-535 : 530-532

publication ID	https://doi.org/ 10.11646/zootaxa.5471.5.1
publication LSID	lsid:zoobank.org:pub:3D7BA3AC-A3BE-4F89-9178-D200841F052F
DOI	https://doi.org/10.5281/zenodo.12208505
persistent identifier	https://treatment.plazi.org/id/038287B7-FFF8-FFA2-7EDE-FE43A52E47EC
treatment provided by	Plazi
scientific name	Blacus (Blacus) tianmushanensis
status	sp. nov.

Treatment

Blacus (Blacus) tianmushanensis sp. nov.

( Figs 27–28 View FIGURE 27 View FIGURE 28 )

Material examined. Holotype: ♀, China, Zhejiang, Tianmu Mtn, Chanyuan Temple , 16.V.1988, Lou Xiaoming, No. 883235 ( ZJUH) . Paratype: 1♀, China, Guizhou, Kuankuoshui Reserve , 2–3. VI .2010, Tang Pu, No. 201003140 ( ZJUH) .

Description. Female. Length of body 2.7 mm, length of fore wing 2.3 mm.

Head. Antennomeres 17, slender ( Fig. 28C View FIGURE 28 ); length of first flagellomere 1.4 × length of second flagellomere; length of first, second and penultimate flagellomere 4.75, 3.5 and 1.8 × their width, respectively; maxillary palp 0.9 × height of head; occipital carina complete; frontal suture distinctly present; OOL: OD: POL = 24: 7: 12; length of eye in dorsal view 0.9 × length of temple; face distinctly rugose ( Fig. 28B View FIGURE 28 ); malar suture absent, length of malar space 2.4 × basal width of mandible.

Mesosoma. Length of mesosoma 1.6 × its height; side of pronotum largely reticulate-rugose ( Fig. 28E View FIGURE 28 ); precoxal sulcus complete, wide and reticulate-rugose ( Fig. 28E View FIGURE 28 ); notauli complete, wide and distinctly crenulate ( Fig. 28D View FIGURE 28 ); mesoscutal middle lobe sparsely pubescence, lateral lobes glabrous; scutellum rugose, its lateral carina complete, not protruding apically; propodeal tubercles absent; surface of propodeum reticulate-rugose, medial area present ( Fig. 28G View FIGURE 28 ).

Wings. Fore wing: parastigma distinctly differentiated from vein C+SC+R, first discal cell nearly acute anteriorly; vein 3-SR+SR1 of fore wing straight; vein CUla of fore wing distinctly bent basally, distinctly below level of vein 2-CU1; 1-CU1: 2-CU1 = 1: 4; 2-M present and long ( Fig. 28H View FIGURE 28 ).

Legs. Hind coxa with a carina dorsally; length of femur, tibia and basitarsus of hind leg 5.5, 10.0 and 9.4 × their width, respectively.

Metasoma. Length of first tergite 2.1 × its apical width, nearly parallel-sided, reticulate-rugose ( Fig. 28G View FIGURE 28 ); remainder of tergites partly distinctly rugose ( Fig. 28G View FIGURE 28 ); length of ovipositor sheath 2.4 × length of fore wing, 7.9 × length of hind femur, 5.45 × length of hind tibia ( Fig. 28I View FIGURE 28 ).

Colour. Brown; half basal of antenna, mandible, palpi, tegulae, all legs and ovipositor yellow; first metasomal tergite yellowish-brown; wing membrane infuscated.

Variation. First discal cell of fore wing acute to narrowly truncate anteriorly; 1-CU1: 2-CU1 = 1: 4 to 1: 6; length of first metasomal tergite 1.9–2.1 × its apical width; hind femur, tibia and tarsus yellow to brown.

Male. Unknown.

Biology. Unknown.

Distribution. China (Zhejiang, Guizhou).

Etymology. The specific name tianmushanensis refers to the collection site of holotype, Tianmu Mtn.

Notes. The new species is similar to B. (B.) longicaudatus Tobias, 1976 because notauli are wide and distinctly crenulate, ovipositor sheath very long, parastigma distinctly differentiated from vein C+SC+R, vein CUla of fore wing distinctly bent basally, distinctly below level of vein, first metasomal tergite nearly parallel-sided, and vein 3-SR+SR1 of fore wing straight, but differs by having scutellum rugose (mainly smooth in B. (B.) longicaudatus ), vein 2-M of fore wing comparatively long (comparatively short), medial area of propodeum present (absent), scutellar sulcus with about 4 carinae (about 7 carinae), antenna comparatively slender apically (less slender), length of ovipositor sheath 2.4 × length of fore wing (0.97 ×), and face distinctly rugose (superficially rugose).

This new species is also similar to B. (B.) rugifacialis sp. nov., but differs by having the body brown (black in B. (B.) rugifacialis ), length of malar space 2.4 × basal width of mandible (2.0 ×), metasomal tergites partly distinctly rugose (slightly punctate), length of first metasomal tergite 1.9–2.1 × its apical width (1.7 ×), length of ovipositor sheath 2.4 × length of fore wing (1.5 ×) and approx. twice as long as body (approx. as long as body).