Walkerella nigrabdomina Ma & Yang, sp. nov.
Creators: name: Peng, Yun-Cui Ma Yan- Qiong
name: Yang, Da-Rong
Publisher: name: Zenodo
Year: 2013
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Hymenoptera
Agaonidae
Walkerella
Walkerella nigrabdomina

description: Walkerella nigrabdomina Ma & Yang sp. nov.
(Figs 1 A–G, 2A–G, 5F, 6F, 7F, 8E)
Type material. Holotype ♀: CHINA, Xishuangbanna, Green Stoneforest, 21°54′N, 101°17′E, H 725±6, 22.III.2012, collected by Y. C. Ma, ex Ficus pisocarpa Bl., (I–1–17 –CEG ethanol collection number). Deposited in Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Kunming, 88 Xuefu Road.
Paratypes: 9 ♀, 2 ♂: same data as holotype; deposited with holotype.
Etymology. “ nigrabdominis ” means black abdomen, and refers to the male having a brownish-yellow body except for a black metasoma.
Diagnosis. Female (Figs 1 A, 5F): antennae inserted close together, slightly anterior of middle of head, near to anterior margin of eyes. POL:OOL = 24:5 (32: 9 in W. kuruandensis, and 28: 8 in W. microcarpae). Male (Figs 2 A– D, 7F, 8E): head and mesosoma brownish-yellow, metasoma black; supraclypeal area raised into sharp longitudinal carina, on either side of which is a low but distinct ridge that diverges laterally towards the mandibular base; antennal scape gradually widening basally (expanding in apical half in W. kuruandensis); mandible basally with one dentiform projection on its internal margin; wing-remnant short, stick-shaped with one macrochaeta.
Affinities. Male (Fig. 7 D–F). Males of W. nigrabdomina, W. microcarpae and W. kuruandensis share a rectangular head, antennae that are inserted close to each other, and a sub-clavate scape (see discussion).
Description of female. Size and colour. Length 1.9–2.2 mm. Head, mesosoma, and all coxae and femora black with iridescent blue, other parts of legs transparent yellow, metasoma black with distinct iridescent bluish-green tinge; eyes and ocelli dark red; antennal scape yellow, pedicel brownish-yellow, rest of antenna smoky-black; wings hyaline.
Head (Figs 1 A, 5F). Shape as in Fig. 1 A, 0.8× as long as wide, with distinct reticulated puncta dorsally on head; eye longer than wide, about 0.7× as wide as long; antennae inserted close together, slightly anterior of middle of head; inter-torular distance a little less than 0.2× oculo-torular distance and 0.6× diameter of torulus; antennal scrobes distinct and parallel; POL:OOL = 24:5. Antennal formula 11253 (Fig. 1 B); scape a little more than 8× as long as broad, cylindrical; pedicel less than 1.5× as long as wide; flagellum with basal two segments forming two small equal anelli, flagellomeres 3–7 forming funicle, the segments all wider than long except basal segment longer than wide, and flagellomeres 8–10 fused to form a club slightly longer than 1.5× its maximum width. Mandible (Fig. 1 C) about 1.5× as long as wide, tridentate with three glands. Maxillary palpus (Fig. 1 D) 4-segmented (4:6:3:12); labial palpus (Fig. 1 D) 2-segmented (1:1).
Mesosoma. Closely reticulate-punctate. Pronotum narrow, a little over 3× as long as wide, with anterior half vertical; mesonotum with mesoscutum slightly less than 0.6× as long as wide, sub-quadrangular; notauli complete; scutellum circular, as long as mesoscutum. Fore wing (Fig. 6 F) about twice as long as wide; distal one-third slightly pubescent, marginal fringe short; submarginal, marginal, stigmal, and postmarginal veins approximately in ratio of 28:14:5:6; stigmal vein with four rounded sensilla distally (as in Fig. 6 F). Hind wing about 3.5× as long as wide; submarginal vein about equal in length to marginal vein; marginal fringe long. Fore leg (Fig. 1 E) with coxa twice as long as wide; femur a little less than 3× as long as wide, widest in middle; tibia longer than coxa, about 0.8× length of femur, and a little more than 4× as long as wide, distally with two small spines on dorsal side and five odontoid spines and a long bifid apical spur on ventral side; tarsus about 0.75× length of tibia; basal tarsomere about one-third length of tarsus and shorter than following three tarsomeres combined. Mid leg (Fig. 1 F) with femur a little more than 4× as long as wide, widest in middle; tibia long, about 9× as long as wide, about the length of femur and trochanter combined, armed with numerous long setae and a long apical spur; tarsus about equal in length to femur, two-thirds length of tibia; basal tarsomere a little less than 0.4× length of tarsus and shorter than following three tarsomeres combined. Hind leg (Fig. 1 G) with coxa a little more than twice as long as wide, distinctly reticulate-punctate dorsally; femur large, 3× as long as wide; tibia equal in length to femur, a little less than 4.5× as long as wide, with numerous long setae, a pair of unequal apical spurs, and about 20 odontoid spines; tarsus a little more than two-thirds length of tibia; basal tarsomere about one-third length of tarsus and equal to the following three tarsomeres combined.
Metasoma. Longer than mesosoma, a little longer than twice its height; tergites two and three with posterior margins usually deeply excised in middle; ovipositor sheaths protruding slightly.
Description of male. Size and colour. Length 2.5–2.9mm. Head, mesosoma, wing remnants and all legs yellow, metasoma black; mandibles reddish-brown; antennal scape brownish-yellow, pedicel and basal three flagellar segments yellow, remainder smoky black; eyes black.
Head (Figs 2 A, 7F). Head a little longer than wide, subrectangular; eye long, 1.8× as long as wide; supraclypeal area raised into sharp longitudinal carina, on either side of which is a low but distinct ridge that diverges laterally towards the mandibular base; clypeus deeply depressed, subquadrangular, with several short setae and two long setae; frons with engraved striation as in Fig. 2 A; posterior transverse groove deepened and widened towards dorsal margins of eyes; antennae inserted close together near middle of head, the distance between toruli slightly less than 0.25× minimum distance to inner margin of eye and barely 0.75× diameter of torulus. Antennal formula 11152 (Fig. 2 B); scape gradually widening distally, sub-clavate, about 3.5× its maximum width; pedicel twice as long as wide; flagellum with one small anellus, five gradually shorter and narrower funicular segments, and two claval segments forming a club slightly shorter than 3× its maximum width. Mandible (Fig. 2 C) large and falcate, slightly shorter than head and a little more than twice as long as wide; bidentate apically and basally with one small dentiform projection on its internal margin.
Mesosoma. Prothorax large. Pronotum subquadrangular and pubescent, about 0.6× as wide as long; mesonotum, metanotum and propodeum combined a little less than 1.5× as wide as long. Fore wing (Figs 2 D, 8E) vestigial, wing remnant about 0.2× as long as mesonotum, metanotum and propodeum combined, stick-shaped with one long macrochaeta. Fore leg (Fig. 2 E) large and strong with coxa about 1.8× as long as wide, its outer face with five bristles; femur large, slightly less than twice its maximum width; tibia about 0.8× length of femur, subclaviform, 3× as long as wide, with long setae, spines, a long bifid spur, and about 20 odontoid spines; tarsus slightly longer than two-thirds length of tibia, the fourth tarsomere a little longer than the two preceding tarsomeres combined. Mid leg (Fig. 2 F) with coxa about 1.66× as long as wide; femur a little more than twice as long as wide; tibia slightly longer than femur but shorter than length of femur and trochanter combined, with numerous setae, a long apical spur and nine odontoid spines; tarsus a little longer than half length of tibia, 4-segmented, the fourth tarsomere shorter than the first and second tarsomeres combined. Hind leg (Fig. 2 G) with coxa about 3× as long as wide, its outer face with six bristles; femur slightly less than 3.5× as long as wide; tibia longer than femur but shorter than length of femur and trochanter combined, about 6× as long as wide, with setae, spines, a pair of apical unequal spurs and about 20 odontoid spines; tarsus longer than half length of tibia, the fourth tarsomere a little shorter than the two preceding tarsomeres combined.
Metasoma. Longer than wide, depressed. Genital armature with two apically rounded dorsal appendages, each with four odontoid spines.
description: Published as part of Peng, Yun-Cui Ma Yan- Qiong & Yang, Da-Rong, 2013, Description of two new species of Walkerella (Pteromalidae, Otitesellinae) from China with a key to species of the genus, pp. 473-482 in Zootaxa 3702 (5) on pages 475-477, DOI: 10.11646/zootaxa.3702.5.6, http://zenodo.org/record/223546