Acmopolynema dilemma S. Triapitsyn

TRIAPITSYN, SERGUEI V. & BEREZOVSKIY, VLADIMIR V., 2007, Review of the Oriental and Australasian species of Acmopolynema, with taxonomic notes on Palaeoneura and Xenopolynema stat. rev. and description of a new genus (Hymenoptera: Mymaridae), Zootaxa 1455 (1), pp. 1-68 : 33-35

Acmopolynema dilemma S. Triapitsyn & Berezovskiy, sp. n.

( Figs 58 –62)

Type material

Holotype female (on slide, BMNH): CHINA, Hainan Island, Tien Fong Mountains , 13.v.1983, Z. Bouček . Paratype: CHINA: same data as holotype but 20.v.1983 [1 male on slide, BMNH] .

Description

FEMALE (holotype). Body and appendages mostly light brown except trabeculae (partially), clava, and exserted part of ovipositor sheaths dark brown; bases of F2 and F3, and also apices of mesotibia, metafemur, and metatibia brown.

Head with vertexal setae short and blunt. Mandible with 2 sharp teeth and 1 (upper) blunt (rounded) tooth.

Antenna ( Fig. 58 ). Scape with cross-ridges on inner surface and several blunt setae, about 2.0 x as long as wide in lateral view; pedicel much shorter than F1; F2 about as long as F3, F4 slightly shorter than F5, F6 the shortest funicle segment; F4–F6 progressively slightly increasing in width; all funicle segments without longitudinal sensilla; clava large, long, about 2.6 x as long as wide, with 9 longitudinal sensilla.

Mesosoma mostly smooth except mesoscutum with fine cellulate sculpture, more conspicuous anteriorly and laterally, and scutellum with finer, inconspicuous cellulate sculpture. Pronotum entire, as long as mesoscutum, with 6 or 7 pairs of mostly strong, blunt setae. Mesoscutum slightly wider than long, much longer than scutellum. Axilla with a row of 5 foveae; axillar seta blunt. Scutellum with an incomplete row of small frenal foveae (laterally only). Propodeum ( Fig. 59 ) with submedial carinae narrow, reaching about 1/2 of its length.

Forewing ( Fig. 60 ) about 3.2 x as long as wide; marginal vein with 2 strong, short, blunt dorsal macrochaetae; marginal fringe short, the longest marginal cilia about 3/10 greatest width of wing; blade with 3 spots, the basal spot small, brown, just behind apex of venation, the second spot large, yellow, in the middle of the blade, and the third spot transverse, brown, in the apical part of blade but not reaching its apex; blade with 2 long and 2 short rows of modified setae (mostly on the two discal colored spots); the anterior long row of modified setae of type A extending from apex of venation almost to wing apex; the middle short row of modified setae of type A mostly on the discal brown spot; the middle long row of modified setae of type A on two apical colored spots and between them; and the posterior short row of modified setae of types A and B mostly on the middle yellow spot. Modified setae of type A, together with shorter and finer setae, also present between the long rows of setae on the middle yellow spot. Hind wing with blade slightly infumate, more so apically; longest marginal cilia 3.7–3.8 x greatest width of blade.

All coxae, femora, and tibiae at least lightly sculptured and with strong, short, mostly blunt setae; metacoxa and metafemur reticulate. Protibia with 2 rows of 10 or 11 conical sensilla; metacoxa with whorls of fine setae.

FIGURES 61, 62. Acmopolynema dilemma (male, paratype). 61. Forewing. 62. Genitalia.

Petiole as long as metacoxa. Ovipositor long, a little more than 9/10 length of gaster, notably exserted beyond its apex (by about 1/5 of the total length of ovipositor); ovipositor length: metatibia length 1.3:1.

Measurements (holotype): Mesosoma: 861; mesoscutum: 297; scutellum: 203; petiole: 364; gaster: 923; ovipositor: 1052. Antenna: scape (excluding radicle): 121; pedicel: 100; F1: 161; F2: 233; F3: 233; F4: 127; F5: 136; F6: 110; clava: 318. Forewing: 2183/689; longest marginal cilia: 212. Hind wing: 1679/48. Legs (given as coxa, femur, tibia, tarsus): fore: 242, 503, 438, 536; middle: 200, 461, 645, 606; hind: 364, 633, 812, 757.

MALE (paratype). Similar to female except for the normal sexually dimorphic features such as antenna, genitalia (Fig. 62), and the following. Body size much smaller (length of mesosoma 455, length of forewing 1169). Color of antennal and leg segments almost uniformly light brown; scape and pedicel very short. Forewing (Fig. 61) narrower than in female, 3.6 x as long as wide; blade conspicuously less pigmented, the colored spots smaller in size (especially the apical spot), with more numerous and evenly distributed modified setae of types A, B, and G than in female; longest marginal cilia 7/10 greatest forewing width.

Diagnosis

Member of the orientale species group. Female of this species is very large (body length more than 2 mm). A small brown spot behind the apex of the venation and a different forewing chaetotaxy distinguishes A. dilemma sp. n. from A. campylurum . Acmopolynema dilemma differs from A. orchidea sp. n. in having one of the mandibular teeth blunt (all three teeth are sharp in A. orchidea ). It differs from A. orientale in having incomplete propodeal submedial carinae that do not reach half the length of the propodeum. Acmopolynema dilemma is particularly similar to A. longicoxillum , which has a significantly different arrangement of setae on the forewing blade in both sexes and also F2 and F3 of the female antenna brown, and F6 brown to dark brown (almost completely yellow-light brown in A. dilemma ).

Etymology

The specific name is a noun in apposition; it was chosen so because of the difficult choice between associating the much smaller male with the very large female (which we did based on the common features of these specimens) and the possibility that they belong to different species.

Figures

FIGURES 58–60. Acmopolynema dilemma (female, holotype). 58. Antenna. 59. Propodeum. 60. Forewing.