Ismarus parvicellus Liu, Chen & Xu

Liu, Jing-xian, Chen, Hua-yan & Xu, Zai-fu, 2011, Notes on the genus Ismarus Haliday (Hymenoptera, Diapriidae) from China, ZooKeys 108, pp. 49-60 : 54-55

Ismarus parvicellus Liu, Chen & Xu sp. n. Figs 9-12

Holotype.

Female. Body length 2.2 mm; fore wing length 1.8 mm.

Head. Head in dorsal view 2.0 times as wide as long; vertex abruptly sloping behind post ocelli; temple narrowed behind eyes; occipital carina strong and complete, not crenulate; POL as long as OOL; toruli separated from each other; face setose; clypeus evenly convex; epistomal sulcus distinct; eye height 7.0 times length of malar space; malar sulcus absent. Scape cylindrical, with apical rim simple; first to third flagellomeres attenuate basally, and gradually incrassate to apex; ratios of length to width of antennal segments: 20: 5; 8: 5; 11: 4; 11: 4; 9: 4; 8: 5; 8: 5; 7: 6; 7: 6; 7: 6; 6: 6; 6: 6; 6: 6; 6: 5; 10: 5.

Mesosoma. Mesosoma in dorsal view 0.75 times as long as width of head; pronotum angular in dorsal view, anteriorly punctate and setose; lateral side of pronotum with anterior and upper margins coarsely punctate, lower half rugose punctate, posterior upper part smooth; mesoscutum smooth and convex; notauli present as small pits on anterior face; humeral sulcus strong, 1.4 times length of tegula; anterior scutellar pit transverse, crenulate inside, median longitudinal carina weak; scutellum smooth, posterior rim weakly concave and subtruncate; propodeum rugose and punctate, with transverse carinae and longitudinal carinae strong; mesopleuron mostly smooth and bare, with upper corner below tegula finely punctate and setose; metapleuron rugose and setose.

Wings. Fore wing with costal, subcostal, basal, marginal, stigmal and postmarginal veins tubular; distal part of median and cubital veins weakly pigmented; radial cell closed, 0.3 times length of marginal vein and 2.3 times as long as its height. Hind wing with a basal cell.

Legs. Fore and middle legs slender; hind tibia strongly incrassate.

Metasoma. Petiole transverse, rugose and with irregular longitudinal carinae; second tergite mostly smooth and scattered with a few setae along lower side, median furrow short, extending to 0.2 times length of second tergite; sutures between tergites complete and well impressed.

Colour.

Body black. Antenna yellowish brown but seventh to eighth flagellomeres blackish brown and ninth to thirteenth flagellomeres black. Legs brown. Wings hyaline, veins brown.

Male.

Unknown.

Distribution.

China (Hainan).

Material examined.

Holotype, female. CHINA: Hainan, Baisha County, Mt. Jiujialing (19.21°N, 109.45°E), 2010.VII.18, YPT, Hua-yan Chen, No. 20100013.

Diagnosis.

This species belongs to the Ismarus halidayi -group and can be distinguished from Ismarus halidayi by having the eye height 7.0 times length of the malar space (4.5 times in Ismarus halidayi ); the radial cell of the fore wing small and 0.3 times length of marginal vein (radial cell as long as marginal vein); the distal part of the median and cubital veins weakly pigmented (median and cubital veins distinctly pigmented); the posterior rim of the scutellum weakly concave and subtruncate (posterior rim of scutellum round).

Etymology.

The specific name is derived from the Latin adjective ‘parvi’ (small) and ‘cell’, referring to the small radial cell of fore wing.