Tamdaona brevizona van Achterberg, 2020

Tian, Xiao-Xia, Achterberg, Cornelis Van, Wu, Jia-Xuan & Tan, Jiang-Li, 2020, New Gnamptodontinae (Hymenoptera: Braconidae) from China and Vietnam, with two genera new for China and seven new species, Zootaxa 4778 (3), pp. 471-508 : 492-493

Tamdaona brevizona van Achterberg , sp. n.

Figs 65–78 )

Type material. Holotype, ♀ ( RMNH), “ Vietnam: Ninh Thân , Núi Chúa N.P., dry south part, 100–180 m, Mal[aise] traps], 22–29.v.2007, C. v. Achterberg & R. de Vries, RMNH’07” . Paratypes: 1 ♀ ( IEBR), with same data as ho- lotype ; 1 ♀ ( RMNH), “ S. Vietnam: Dak Lak, Chu Yang Sin N.P., n[ea] r dam , c. 500 m, c. 500 m, Mal[aise] traps], 3–9.vi.2007, C. v. Achterberg & R. de Vries, RMNH’07” .

Description. Holotype, ♀, length of fore wing 1.8 mm, and of body 2.2 mm.

Diagnosis. Antenna of ♀ with 20 or 21 antennomeres ( Fig. 65 ); frons without medio-longitudinal depression ( Fig. 74 ); rim of mesoscutum dark brown near tegulae ( Fig. 70 ); notauli rather wide anteriorly ( Fig. 70 ); mesosoma ventrally and more or less posteriorly yellowish brown ( Fig. 69 ); propodeum gradually lowered posteriorly ( Fig. 65 ); vein 3-SR of fore wing 1.1–1.2 × as long as vein r ( Fig. 67 ); vein 1-R1 1.1–1.3 × longer than pterostigma ( Fig. 67 ); second submarginal cell of fore wing distinctly narrowed anteriorly ( Figs 65 , 67 ); legs pale yellowish; basal area of second metasomal tergite transverse and finely reticulate ( Fig. 71 ), narrow and medially 0.10–0.15 × as long as wide anteriorly, hardly or not protruding medio-posteriorly ( Fig. 71 ); second tergite rather transverse and 1.2–1.3 × as long as third tergite ( Fig. 71 ); second metasomal suture rather wide medially ( Fig. 71 ); fourth and fifth tergites largely smooth ( Figs 71 ); setose part of ovipositor sheath 0.33–0.38 × as long as fore wing ( Fig. 65 ).

Head. Antenna with 21 antennomeres, scapus longer dorsally than ventrally ( Fig. 65 ), length of third antennomere 1.2 × fourth antennomere, third, fourth and penultimate antennomeres 2.7, 2.3 and 2.0 × as long as wide, respectively ( Figs 76, 77 ); maxillary and labial palpi with 6 and 4 segments, respectively; length of maxillary palp equal to height of head; temple smooth; hypostomal flange narrow; eye 4.0 × as long as temple in dorsal view; temples directly narrowed behind eyes ( Fig. 74 ); OOL:diameter of posterior ocellus:POL = 30:14:14; vertex and frons largely smooth and shiny, but near eye superficially micro-sculptured and vertex distinctly setose; face remotely punctulate, shiny and convex ( Fig. 73 ); clypeus truncate medially and ventral rim thin, medially moderately convex and with some punctures; hypoclypeal depression 0.4 × as wide as face, medium-sized and rather shallow; malar suture absent; length of malar space 1.2 × basal width of mandible; mandible rather flat medially and smooth, strongly narrowed and twisted apically.

Mesosoma. Length of mesosoma 1.5 × its height; pronotum partly horizontal anteriorly and with large slit-like pronope ( Fig. 70 ); side of pronotum smooth, but with some crenulae anteriorly ( Fig. 69 ); mesopleuron convex, shiny and smooth; precoxal sulcus present as short oblique groove medially with some fine crenulae; episternal scrobe present, linear; pleural sulcus smooth except for some indistinct micro-crenulation ventrally; mesosternal suture deep, narrow and micro-crenulate; notauli complete, smooth, moderately wide and distinctly impressed ( Fig. 70 ); mesoscutum convex, strongly shiny, and largely smooth, setose except middle of lateral lobes and medio-posteriorly with longitudinal groove between notauli; scutellar sulcus narrowed laterally and with one long crenula and some micro-crenulation ( Fig. 70 ); scutellum wide, distinctly convex, setose, largely smooth and shiny; metapleuron largely smooth; propodeum evenly convex, shiny and largely smooth but dorsally micro-sculptured and some rugulae ( Fig. 71 ), only posteriorly with pair of short carina and anterior half with medio-longitudinal carina.

Wings. Fore wing: pterostigma triangular ( Fig. 67 ); second submarginal cell distinctly narrowed anteriorly ( Fig. 67 ); 1-SR much longer than wide; 1-SR+M present anteriorly, but very narrow; 1-R1 1.3 × longer than pterostigma; vein r emitted from middle of pterostigma and slender; r:3-SR:SR1:2-SR = 10:11:64:20; vein SR1 nearly straight; m-cu antefurcal; 1-CU1 widened, about as long as cu-a; 1-CU1:2-CU1 = 1:7; CU1b complete; basal and subbasal cells of fore wing similarly setose as other cells. Hind wing: M+CU:1-M:1r-m = 21:40:13; basal and subbasal cells less densely setose than other cells; m-cu faintly indicated.

Legs. Hind coxa smooth; tarsal claws medium-sized and simple ( Fig. 78 ); length of femur, tibia and basitarsus of hind leg 3.6, 8.8 and 5.1 × as long as their maximum width; hind tibial spurs 0.35 × as long as basitarsus.

Metasoma. First tergite 0.9 × longer than its apical width, gradually widened apically, convex, densely rugulose, shiny, dorsope absent, its dorsal carinae coarsely developed basally, converging, posteriorly weakly developed and merging in sculpture ( Fig. 71 ); first tergite laterally with deep elliptical laterope in smooth glymma; second tergite and most of third tergite densely reticulate-rugulose (including basal area), following tergites largely smooth ( Fig. 71 ); basal area of second tergite transverse and finely reticulate, narrow triangular and medially 0.13 × as long as combined second and third tergites; second metasomal suture and antero-lateral grooves of third tergite distinct and crenulate ( Fig. 71 ); epipleura of second and third tergites semi-transparent; ovipositor sheath subparallel-sided and apically pointed, its setose part 0.38 × as long as fore wing, 2.2 × first tergite and 4.0 × hind basitarsus; ovipositor slightly compressed and hardly widened subapically, with small subapical nodus.

Colour. Yellowish brown; palpi, mouth parts and metasoma ventrally (except apically) white; scapus largely, pedicellus ventrally, tegulae and legs (but telotarsi dark brown) pale yellowish; remainder of antenna, stemmaticum, narrow stripe in front of tegulae, metanotum, propodeum, first tergite (except posteriorly), second tergite (except laterally) and third tergite medio-anteriorly dark brown or brown; pterostigma and most veins of fore wing (except basally) brown; wing membrane subhyaline.

Variation. Length of fore wing 1.7–1.9 mm and of body 2.2–2.4 mm; antennal segments of ♀ 20(1), 21(1); se- tose part of ovipositor sheath 0.33–0.38 × as long as fore wing; propodeum brown or dark brown; fourth metasomal tergite smooth or faintly micro-sculptured.

Etymology. Named after the comparatively short basal area of the second tergite: “brevis” is Latin for “short” and “zona” for “area”.

Distribution. Oriental: Vietnam. Collected in coastal open forest at 100–180 m and lowland forest at 500 m.

Figures

FIGURES 65, 66. Tamdaona brevizona sp. n., ♀, holotype. 65 habitus, lateral aspect 66 first metasomal tergite, dorsal aspect.

FIGURES 67–78. Tamdaona brevizona sp. n., ♀, holotype. 67 fore wing 68 hind wing 69 mesosoma, lateral aspect 70 mesosoma, dorsal aspect 71 propodeum and metasoma, dorsal aspect 72 hind leg, lateral aspect 73 head, anterior aspect 74 head, dorsal aspect 75 head, lateral aspect 76 base of antenna 77 apex of antenna 78 hind tarsus, outer lateral aspect.