Ecphylus lini Belokobylskij, 2020

Belokobylskij, S. A. & Lin, Ch. - Sh., 2020, A new species of the genus Ecphylus (Hymenoptera: Braconidae: Doryctinae) from Taiwan, with a diagnostic character previously unknown in the genus, Zoosystematica Rossica (Zoosyst. Rossica) 29 (1), pp. 23-32 : 25-26

Ecphylus lini Belokobylskij , sp. nov.

( Figs 1 , 2)

Holotype. Female, Taiwan, Nantou County, Dasyue Mt., 782 m, 24°12.1110′ N; 120°53.3170′ E, 13.V.2019, Ching Shan Lin leg.; host: Scolytus japonicus Chapuis on Zelkova serrata (Ulmaceae) ( NMNS).

Paratypes. 1 female, 2 males, with same labels as in holotype ( ZISP) ; 4 females, 3 males, same labels, but 24.III.2019 ( TARI, ZISP) ; 12 females, 12 males, same labels, but 29.V.2019 ( NMNS, TARI, ZISP) .

Description. Female. Body length 1.6–2.7 mm; fore wing length 1.4–2.1 mm.

Head width (dorsal view) 1.6–1.7 times its median length, 1.0–1.1 times width of mesoscutum. Head behind eyes (dorsal view) weakly and convex-roundly narrowed; transverse diameter of eye 1.5–1.7 (rarely, in small specimens, as little as 1.2) times length of temple. Ocelli rather small, arranged in triangle with base 1.3–1.4 times its sides; POL 1.2-1.8 times Od, 0.45–0.55 times OOL. Eye glabrous, 1.3–1.5 times as high as broad. Malar space about 0.5 times height of eye, 0.9–1.0 times basal width of mandible. Face width almost equal to height of eye and 1.15–1.20 times height of face and clypeus combined. Hypoclypeal depression round, its width 0.6–0.7 times distance from edge of depression to eye, 0.35–0.40 times width of face. Occipital carina ventrally almost joined with hypostomal carina by additional ruga distinctly above base of mandible. Head below eyes (front view) distinctly and roundly narrowed.

Antenna slender, filiform, 17–21-segmented, 1.1–1.2 times longer than body. Scape 1.5–1.6 times longer than its maximum width, 1.8–2.0 times longer than pedicel. First flagellar segment 4.0–4.5 times longer than its apical width, 0.80–0.85 times as long as second segment. Penultimate segment 3.0–3.6 times longer than wide, about as long as first flagellar segment, 0.7–0.8 times as long as apical segment; the latter weakly acuminate apically.

Mesosoma. Length 1.7–1.8 times height. Pronotum (dorsal view) with its anterior margin straight and with pointed antero-lateral angles. Pronotal carina distinct and high, situated in anterior third or quarter of pronotum. Mesoscutum (lateral view) highly and almost perpendicularly elevated above pronotum; anteriorly (dorsal view) almost straight, with distinct anterolateral angles; 1.0–1.1 times as wide as median length; median lobe with shallow but distinct and almost complete longitudinal median furrow. Notauli complete, mainly deep, wide, distinctly crenulate. Prescutellar depression (scutal sulcus) deep, rather short, with six–seven carinae, smooth between them, 0.35–0.40 times as long as scutellum. Scutellum weakly convex, with distinct lateral carinae. Subalar depression rather deep, narrow, striate-rugose and sometimes partly smooth. Sternaulus deep, rather wide, straight, mainly smooth, but sometimes with weak curved striae below, short, running along anterior 0.4–0.5 of lower part of mesopleuron. Metanotum (lateral view) with short, but distinct, basally wide and apically acuminate dorsal tooth. Metapleural lobe rather short, wide, rounded apically.

Wings. Fore wing 3.4–3.6 times its maximum width. Pterostigma rather narrow, 5.0–5.5 times longer than maximum width. Radial (marginal) cell wide, weakly shortened, 3.5–3.7 times longer than wide. Metacarp (1-R1) 1.2–1.4 times longer than pterostigma. Radial vein (r) arising almost from middle of pterostigma, its first abscissa (r) 1.8–2.0 times longer than maximum width of pterostigma. Second radial abscissa (3-SR+SR1) almost straight in anterior half and weakly curved posteriorly or sometimes weakly evenly curved, 5.0–5.5 times longer than first radial abscissa (r), 5.8–8.1 times longer than first radiomedial vein (2-SR). First radiomedial vein (2-SR) (0.4) 0.6– 0.9 times as long as first radial abscissa (r), (0.4) 0.8–1.3 times as long as second medial abscissa (2-SR+M), 0.9–1.3 times as long as recurrent vein (m-cu). First medial abscissa (1-SR+M) weakly or very weakly sinuate. Discoidal (discal) cell 1.8– 2.3 times longer than wide. Second (posterior) abscissa of basal vein (1-M) 1.5–1.7 times longer than first (anterior) abscissa (1-SR), weakly convergent with recurrent vein (m-cu) and 2.0–2.6 times longer than it. Mediocubital vein (M+CU1) evenly curved. Fused submedial (subbasal) and brachial (subdiscal) cells closed weakly before level of recurrent vein (m-cu). Hind wing 4.7–5.2 times longer than wide.

Legs. Hind femur without dorsal protuberance, its length 3.1–3.4 times maximum width. Hind tarsus 0.8–0.9 times as long as hind tibia. Hind basitarsus weakly thickened, 0.75–0.85 times combined length of second to fifth segments. Second segment of hind tarsus 0.3–0.4 times as long as basitarsus, about as long as fifth segment (without pretarsus).

Metasoma 0.9–1.0 times as long as head and mesosoma combined. First tergite with distinct dorsope, without spiracular tubercles, evenly, strongly and linearly widened from base to apex. Maximum width of first tergite 2.0–2.5 times its basal width; its length 0.75–0.80 times apical width, 1.2–1.4 times length of propodeum. Second suture very fine and weakly curved. Median length of second tergite 0.30–0.35 times its basal width, 1.2–1.5 times length of third tergite. Combined length of second and third tergites 0.5– 0.6 times basal width of second tergite and 0.4– 0.5 times their maximum width. Ovipositor sheath (lateral view) 0.4–0.7 times as long as metasoma, 0.6–0.8 times as long as mesosoma, and 0.25– 0.35 times as long as fore wing.

Sculpture and pubescence. Vertex coarsely transversely striate in anterior half and finely striate to almost smooth in posterior half (rarely, in small specimens, vertex finely striate in anterior half and smooth in posterior half), with complete coarse transverse curved carina between median and lateral ocelli; frons entirely coarsely transversely striate. Temple entirely smooth. Face usually with some smoothed, fine or sometimes with rather distinct transverse striation. Lateral lobes of mesoscutum weakly and densely granulate-reticulate, median lobe rather coarsely rugulose, sometimes partly with fine granulation between rugae, coarse undulate striate with rugosity in its posterior half. Scutellum smooth. Mesopleuron mostly smooth. Propodeum entirely coarsely and densely rugose-reticulate, with undulate median longitudinal carina in basal half, without delineated areola. Hind coxa and femur mostly smooth, coxa dorsally finely rugulose. First tergite with distinct, convex and subparallel complete dorsal carinae, with coarse lateral carinae; entirely coarsely longitudinally striate, without rugulosity. Second tergite entirely and third tergite baso-laterally with coarse straight striae, most posterior part of third tergite smooth. Remaining tergites smooth. Vertex with short and very sparse yellow setae medially and laterally, otherwise almost glabrous. Mesoscutum with sparse, very short and semi-erect pale setae arranged in narrow stripes along notauli and marginally. Hind tibia dorsally with short, rather dense and semi-erect pale setae; length of these setae 0.4–0.6 times maximum width of hind tibia.

Colour. Body mainly reddish brown, sometimes faintly darker dorsally, head sometimes darker, mesosoma with yellowish tint laterally. Antenna mainly dark reddish brown to black, 6th to 8th basal segments yellow to brownish yellow. Palpi pale yellow. Legs mostly yellow, trochanters whitish, hind leg sometimes faintly infuscate. Ovipositor sheath black. Fore wing subhyaline. Pterostigma brown to pale brown, yellowish apically.

Figures

Fig.1. Ecphylus lini sp. nov., holotype, female (A, C–L) and paratype, male (B, M, N). A, B, habitus; C, antenna apically; D, antenna basally; E, head and mesoscutum; F, head; G, head; H, head and mesosoma; I, mesosoma and first metasomal tergite; J, hind coxa and femur; K, hind tibia; L–M, metasoma. Lateral (A, B, G, H, J–N), dorsal (E, I, M) and frontal (F) view. Scale bars: 1 mm.