Streblocera (Eutanycerus) laterostriata Li, Chen & van Achterberg, 2021

Li, Jun, Achterberg, Cornelis van, Zheng, Min-Lin & Chen, Jia-Hua, 2021, Revision of Streblocera Westwood (Hymenoptera, Braconidae, Euphorinae) from China, with the description of seven new species, ZooKeys 1044, pp. 729-782 : 729

Streblocera (Eutanycerus) laterostriata Li, Chen & van Achterberg sp. nov. Figures 7A-E , 8F-I

Type material.

Holotype, ♀, SW China, Yunnan Province, Wenshan City, Malipo County, Tiechangtuanxiang, 20.viii.2017, Yan-Qiong Peng, 1372 m.

Description.

Holotype, ♀, length of antenna 3.9 mm, of fore wing 3.3 mm, and of body 4.0 mm (Fig. 7A ).

Head. Antenna with 24 antennomeres and 1.2 × longer than fore wing, 0.9 × as long as body (Fig. 7A ); scapus slender, straight and no expanded, 7.5 × longer than its maximum width, without horn, finely setose (Fig. 7C ); all flagellomeres unmodified, first flagellomere 1.5 × longer than second flagellomere, first, second and penultimate flagellomere 3.5, 2.3 and 1.5 × longer than wide, respectively (Fig. 7C ); eye 1.5 × longer than temple in dorsal view (Fig. 7D ); temples roundly behind eyes; ocelli medium size, OOL:OD:POL = 19:2:12 (Fig. 7D ); frons rugose and setose (Fig. 7D ); vertex largely punctate and setose (Fig. 7D ); occipital carina nearly complete, interrupted medio-dorsally (Fig. 7D ); face 2.6 × wider than high, rugose to punctate (Fig. 7E ); clypeus punctulate and convex, narrow slightly than face, 2.7 × wider than high (Fig. 7E ); dorsal margin of clypeus above level of ventral margin of eye in anterior view (Fig. 7E ); tentorial pits very large (Fig. 7E ); malar suture shallow and wide, length of malar space 0.7 × basal width of mandible (Fig. 7E ); mandibles stout (Fig. 7E ).

Mesosoma. Length of mesosoma 1.6 × its height (Fig. 8G ); side of pronotum crenulated to rugose (Fig. 8G ); propleuron smooth (Fig. 8G ); mesopleuron rugose and foveolate (Fig. 8G ); prepectal medio-ventral carina present (Fig. 8G ); episternal scrobe wide (Fig. 8G ); precoxal sulcus long, wide and crenulate (Fig. 8G ); mesonotum sparsely setose, flat, smooth and shiny; notauli narrow and carina; mesoscutum sparsely setose, flattened; scutellar sulcus wide and rugose with one distinct crenula; scutellum flat, smooth; metapleuron reticulate (Fig. 8G ); propodeum rugae and foveolae (Fig. 8F ).

Wings. Fore wing (Fig. 8I ): vein 1-SR+M absent; vein 1-R1 0.7 × as long as pterostigma; vein SR1+3-SR curved, largely unstained; r:2-SR = 13:65; vein r issued slightly behind middle of pterostigma; vein m-cu cross vein 2-SR; vein cu-a distinct longer than vein 1-CU1 and postfurcal.

Legs. Fore leg: tibia 5.0 × longer than coxa, 1.8 × longer than femur; middle leg: tibia 4.4 × longer than coxa, 1.3 × longer than femur; hind leg: tibia 5.6 × longer than coxa, 1.1 × longer than femur; hind coxa smooth, 1.8 × longer than wide; femur, tibia and basitarsus 6.1, 15.6 and 6.7 × longer than wide, respectively; hind basitarsus 0.1 × as long as hind tibia; hind fourth tarsal segment 0.8 × as long as fifth tarsal segment.

Metasoma. First tergite 2.0 × longer than its apical width, and apical width 3.4 × its minimum width, with large dorsope basally (Fig. 8H ); first tergite smooth basally, striate laterally (Fig. 8H ); following tergites smooth and shiny; ovipositor sheath striate basally, 0.2 × as long as fore wing; ovipositor long and straight (Fig. 7B ).

Colour. Dark brown to black; face, basal part of antenna and of ovipositor sheath and ovipositor dark brown; wing membrane infuscate, pterostigma and veins dark brown.

Remarks.

This new species can be distinguished from related species by its unique “simple” antenna. Only S. (E.) sichuanensis Wang, 1986 shares this character with new species, but the new species differs from it as follows: (i) antenna with 24 antennomeres, scapus 7.5 × longer than its maximum width (antenna with 21 antennomeres, scapus 5.7 × longer than maximum width in S. sichuanensis ); (ii) first metasomal tergite 2.0 × longer than its apical width, striate laterally (first tergite 2.5 × longer than its apical width, smooth laterally); (iii) propodeum without basal carina (propodeum with basal carina); (iv) ovipositor long and straight (ovipositor curved apically).

Biology.

Unknown.

Distribution.

Oriental: China (Yunnan).

Etymology.

Named after the laterally striate first tergite; “lateralis” is Latin for "of the side" and “stria” is Latin for “line”.

Figures

Figure 7. Streblocera (Eutanycerus) laterostriata Li, Chen and van Achterberg, sp. nov., ♀ A habitus, lateral aspect B ovipositor and its sheaths, lateral aspect C antenna D head, dorsal aspect E head, anterior aspect.

Figure 8. Streblocera (Eutanycerus) laterostriata Li, Chen and van Achterberg, sp. nov., ♀ F mesosoma, lateral aspect G propodeum, dorsal aspect H first metasomal tergites, dorsal aspect I wings.