Spathius macrurus, Tang & Belokobylskij & Chen, 2015

Tang, Pu, Belokobylskij, Sergey & Chen, Xue-Xin, 2015, Spathius Nees, 1818 (Hymenoptera: Braconidae, Doryctinae) from China with a key to species, Zootaxa 3960 (1), pp. 1-132 : 62-66

Spathius macrurus sp. nov.

( Fig. 19 )

Description. Female. Body length 5.1 mm; fore wing length 3.8 mm.

Head. Antennae weakly setiform, more than 29-segmented (apical segments missing). Scape 1.7 × as long as its maximum width. First flagellar segment 5.5 × as long as its apical width, 1.25 × as long as second segment. Subapical segments about 3.0 × as long as their width. Head width (dorsal view) 1.7 × its median length, 1.3 × as wide as mesoscutum. Head behind eyes (dorsal view) convex-roundly narrowed; transverse diameter of eye 1.4 × length of temple. Ocelli medium-sized, arranged in triangle with base 1.2 × its sides; POL: Od: OOL = 3.0: 4.0: 10.0. Vertex distinctly evenly coarsely transversely striate, without additional sculpture between striae, smooth laterally. Eye almost glabrous, 1.25 × as high as broad. Malar space 0.4 × eye height and 0.6 × basal width of mandible. Temple entirely smooth. Face with dense, distinct and weakly curved transverse striae and with fine additional reticulation. Face width equal to eye height and almost equal to height of face and clypeus combined. Hypoclypeal depression large and subround, its width about equal to distance from edge of depression to eye, 0.4 × width of face. Occipital carina complete dorsally, ventrally not joined with hypostomal carina obliterating upper base of mandible.

Mesosoma. Length of mesosoma 2.1 × its height. Pronotal keel distinct, its posterior branch fused with posterior margin of pronotum on very short distance; anterior branch situated near middle of pronotum. Mesoscutum highly and evenly roundly elevated above pronotum, its median lobe convex anteriorly and without anterolateral corners. Mesoscutum densely granulate, with rather long and dense rugae situated along notauli and laterally, with two distinct and weakly convergent posteriorly, almost straight carinae in medioposterior third; mostly glabrous, with rather sparse, long and semi-erect golden setae arranged widely along notauli and in single line laterally. Notauli anteriorly distinct, rather wide, crenulate, deep anteriorly and shallow posteriorly. Prescutellar depression rather shallow, not long, with four carinae, reticulate-granulate, 0.3 × as long as scutellum. Scutellum entirely densely and finely coriaceous, weakly convex, with distinct lateral carinae. Mesopleuron almost entirely finely coriaceous, anteriorly almost smooth. Subalar depression shallow, wide, densely and curvedly striate with rugosity. Precoxal sulcus distinct and coarsely crenulate, deep, rather wide, distinctly sinuate, deep along anterior 0.5 and more shallow along posterior 0.5 of lower part of mesopleuron. Propodeum with short and wide lateral tubercles, with basolateral areas distinctly delineated by carinae and mainly rugose-striate, rest part of propodeum mainly and densely rugose-reticulate; areola narrow and relatively long; basal carina present in basal third, about as long as anterior fork of areola.

Wings. Fore wing 3.8 × as long as wide. Vein r arising from middle of pterostigma. 3-SR: r: SR1: 2-SR = 29: 6: 56: 22. Second submarginal cell not narrowed distally, its length 3.0 × maximum width, 1.4 × length of first subdiscal cell. Vein CU1a not interstitial, arising almost from middle of posterior margin of first subdiscal cell. Hind wing vein M+CU 0.6 × as long as vein 1-M. Vein m-cu weakly antefurcal, oblique towards base of wing, weakly curved, very faintly infuscate.

Legs. Hind coxa dorsally densely transversely striate with rather fine granulation, densely granulate below at rest part, with distinct basoventral corner and tooth. Hind femur mainly smooth, finely longitudinally striate dorsally, 3.2 × as long as wide. Hind tibia apically without spines on outer side. Dorsal surface of hind tibia with rather long, dense and semi-erect setae, their length 0.7–1.0 × maximum width of tibia. Hind tarsus 0.9 × as long as hind tibia. Hind basitarsus 0.8 × as long as second-fifth segments combined. Second segment of hind tarsus 0.4 × as long as basitarsus, almost as long as fifth segment (without pretarsus).

Metasoma. Petiole (lateral view) very weakly curved ventrally, dorsally weakly and evenly arched, weakly thickened in anterior third; widened in apical fifth (dorsal view), with small spiracular tubercles in weakly widened basal third. Length of petiole 3.0 × its apical width, 2.0 × length of propodeum. Second tergite without separate laterotergites. Median length of second and third tergites combined 1.4 × basal width of second tergite, 0.85 × as long as their maximum width. Second suture absent. Petiole distinctly and rather densely longitudinally striate, with dense and fine reticulation between striae. Second tergite finely striate in basolateral third and interruptedly finely coriaceous submedially. Remaining tergites entirely smooth. Ovipositor straight. Ovipositor sheath 3.6 × as long as petiole, 1.8 × as long as metasoma, 2.5 × as long as mesosoma, as long as fore wing.

Colour. Body dark reddish brown to almost black partly, head yellowish brown, dark posteriorly. Antennae pale brown basally, brown to dark brown mainly, without visible pale subapical segments. Palpi yellow. Legs yellow to brownish yellow, hind coxa light reddish brown, hind femur medially brown, yellow basally, hind tibia basally dark. Ovipositor sheath brown almost entirely. Fore wing faintly and almost evenly infuscate. Pterostigma brown, pale yellow in basal third and apically.

Male. Unknown.

Material examined. Holotype. female, China, Zhejiang Prov., Kaihua Gutianshan , 1.VIII.1990, Ma Yun, No. 906119 ( ZJUH).

Comparative diagnosis. This new species belongs to the S. fasciatus Walker species group. Spathius marcrurus sp. nov. is similar to S. ogasawarus Belokobylskij et Maeto , but differs in having the vertex evenly and smooth striate (rugulose-striate in S. ogasawarus ), temple longer (shorter in S. ogasawarus ), rugae on mesoscutum along notauli short (distinctly long in S. ogasawarus ), areola of propodeum short and basal carina long (areola very long and basal carina short in S. ogasawarus ), hind coxa granulate laterally (rugose-striate in S. ogasawarus ), and the second metasomal tergite partly with fine aciculation (entirely smooth in S. ogasawarus ). This new species is also similar to Chinese S. carterus Chen et Shi , but differs in having the malar space short (long in S. carterus ), mesoscutum roundly elevated above pronotum (almost sharply elevated in S. carterus ), petiole 2.0 × as long as propodeum (1.2 × in S. carterus ), and ovipositor as long as body (shorter than body in S. carterus ).

Etymology. From “macro” (Greek for “long”) and “urus” (Greek for “limb”) because of ovipositor long.

Distribution. China (Zhejiang).

Figures

FIGURE 19. Spathius macrurus sp. nov. A, habitus, lateral aspect; B, head, dorsal aspect; C, head, frontal aspect; D, fore wing; E, petiole, lateral aspect; F, mesoscutum, dorsal aspect; G, mesosoma, lateral aspect; H, metasoma, dorsal aspect. Scale bar 0.5 mm.