Centrodora crassiscapa Li & Chen

Chen, Ye & Li, Cheng-De, 2017, Two new species of Centrodora (Hymenoptera, Aphelinidae) from China, with a key to Chinese species, ZooKeys 687, pp. 53-61 : 54-55

Centrodora crassiscapa Li & Chen sp. n. Figs 1-8, 9-11

Type material.

Holotype: female [on slide, NEFU], CHINA, Heilongjiang Province, Shangzhi City, Laoyeling (45°24.71'N, 127°40.41'E), 8-18.VII.2013, Cheng-de Li, Ye Chen, Chao Zhang, MT. Paratypes: 1 male [on slide, NEFU], same data as holotype. 1 male [on slide, NEFU], CHINA, Heilongjiang Province, Shangzhi City, Laoyeling, 7-16.VIII.2013, Cheng-de Li, MT.

Diagnosis.

Centrodora crassiscapa sp. n. is easily distinguished by following combination of characters: enormously thick scape, largely dark brown mesosoma, completely dark brown metasoma, long and strongly exserted ovipositor.

Description.

Female. Holotype. Length about 1.2 mm. Head dark brown. Eyes and ocelli dark brown. Antenna mostly brown, except pedicel and F1 paler. Mandible dark brown. Mesosoma largely dark brown, except metanotum and propodeum yellow. Median area of the mesoscutum and mesoscutellum with a distinctly pale mid-longitudinal groove. Fore wing with basal one fourth hyaline, area posterior to marginal vein brown, remaining wing disc faintly infuscate; hind wing hyaline. Legs largely yellow, except fore leg with distal half of femur and tibia brownish-yellow; mesofemur and hind leg with coxa and femur brown. Metasoma dark brown to black.

Head (Fig. 1), in frontal view, 0.95 × as high as wide, and finely reticulate, with the sculpture on malar space lineolate reticulated. Frontovertex 0.43 × head width and with numerous brown setae. Ocellar triangle with apical angle obtuse. Mandible with two acute teeth and a blunt dorsal tooth. Antennae (Fig. 2) with scape 3.26 × as long as wide, remarkably wider than any other antennal segments and slightly longer than clava; pedicel 2.14 × as long as wide, and 0.83 × as long as F3; F1 subtriangular, with ventral margin 1.40 × as long as wide; F2 2.0 × as long as wide; F3 with dorsal margin 3.21 × as long as wide, and 0.6 × as long as clava; clava 3.95 × as long as wide, pointed and distinctly curved ventrally at apex. Measurements, length (width): scape, 163 (50); pedicel, 75 (35); F1, 28 (20); F2, 40 (20); F3, 90 (28); clava 150 (38).

Mesosoma. Pronotum imbricate, mesoscutum and mesoscutellum mainly polygonal reticulate. Mesoscutum with median area (Fig. 3) 0.83 × as long as wide, 1.4 × as long as mesoscutellum, and with 10 setae; each lateral area of the mesoscutum and axilla with 2 and 1 setae respectively; mesoscutellum (Fig. 4) 0.58 × as long as wide, with 2 pairs of setae. Distance between anterior pair of scutellar setae 0.9 × that between posterior pair. Placoid sensilla much closer to anterior pair of setae than to posterior pair. Fore wing 3.57 × as long as wide, with marginal setae 0.08 × wing width. Costal cell slightly longer than marginal vein, with 2 distal setae on dorsal surface; submarginal vein with 4 setae, marginal vein with 8 long setae along anterior margin, postmarginal vein short and about one third of length of stigmal vein; basal cell with 2 setae. Linea calva closed by a line of setae posteriorly. Hind wing (Fig. 6) 7.17 × as long as wide, marginal setae about 0.53 × as long as wing width. Mesotibial spur (Fig. 7) distinctly shorter than (0.64 ×) corresponding basitarsus, and about as long as the second tarsomere. Measurements, length (width): fore wing 1250 (350); costal cell, 270; marginal vein, 260; postmarginal vein, 13; stigmal vein, 39; marginal setae, 28; hind wing, 1075 (150); marginal setae, 80; mesotibia, 390, mesotibial spur, 90, mesobasitarsus, 140.

Metasoma (Fig. 8) about 1.75 × as long as mesosoma. Ovipositor 3.25 × as long as mesotibia and strongly exerted, with the exerted part 0.46 × as long as ovipositor. Third valvula 4.18 × as long as mesobasitarsus. Length measurements: ovipositor, 1268; third valvula, 585.

Male. Length 0.73-0.78 mm. Colour similar to the female, except median area of mesoscutum a little paler.

Head, in frontal view, 0.9 × as high as wide and frontovertex about 0.4 × head width. Scape (Fig. 9) flattened and expanded medially, 2.37 × as long as wide; pedicel 1.64 –1.70× as long as wide; F1 triangular, 1.20 × as long as wide, F2 anelliform, F3 long, 2.69 –2.85× as long as wide, and 0.71 –0.77× as long as clava; clava 3.69 –4.08× as long as wide, slightly longer than scape. Fore wing (Fig. 10) 3.04 × as long as wide, marginal setae 0.17 × wing width; hind wing 7.11 –7.25× as long as wide, marginal setae 0.63 × wing width. Genitalia (Fig. 11) 5.30 × as long as wide, and about as long as mesotibia.

Remarks.

The new species is close to C. amoena Förster 1878, with similar colour on the head and metasoma and strongly exserted ovipositor. However, it can be separated from the latter by the thickened scape of the female antennae (normal in C. amoena ), completely dark brown mesoscutum (vs largely yellow), clava 3.95 × as long as wide (vs 3.5 ×), male antenna with F3 2.69 –2.85× as long as wide (vs about 4 ×, cf. Nikol’skaya and Yasnosh 1966, fig. 162).

Host.

Unknown.

Etymology.

Latin: crassus = thick, fat; and the specific name refers to the enormously thick scape of the female antennae.

Distribution.

China (Heilongjiang).