Chrysoctonoides longisetosa Huber & Triapitsyn

Huber, John T. & Triapitsyn, Serguei, 2015, Redescription of Chrysoctonus and description of Chrysoctonoides (Hymenoptera, Mymaridae), a new genus from the Australian Region, ZooKeys 505, pp. 79-101 : 89-97

Taxon classification Animalia Hymenoptera Mymaridae

Chrysoctonoides longisetosa Huber & Triapitsyn sp. n. Figs 41-47, 48, 49, 50-52, 53-55, 58-66

Holotype female

(ANIC) on slide, labelled: 1. "17.37S 145.34E, QLD BS3 Massey Creek, 1000m, 30 May– 1 July 1996, P. Zborowski, 1000m, FI Trap JCU". 2. "Chrysoctonoides longisetae ♀ Huber & Triapitsyn HOLOTYPE".

Paratypes.

4 ♀ and 2 ♂. AUSTRALIA. Queensland: Atherton, 17.17°S, 145.29°E, 2-16.iii.1988, D.C.F. Rentz, stop A-1, flight intercept trap (1♀, ANIC); Heberton, 30.xii.97-5.i.1998, A. Zwick, rainforest (1♂, CNC); Lake Eacham Na tional Park, 17.17°S, 145.37°E, 760m, 3-7.xi.1976, R.W. Taylor & T.A. Weir (1♀, 1♂, ANIC); Massey Creek, 17.37°S, 145.34°E, 1000m, 3. x– 2.xi.1995, L. Umback (1♀, ANIC); 11 km ENE of Mt. Tozer, 12.43°S, 143.18°E, 11-16.vii.1986, T. Weir, rainforest litter, Berlese, 1063 (1♀, ANIC).

Other material examined.

AMERICAN SAMOA. Tutuila Island, Mapusaga, 20-27.i.2002, M. Schmaedick, YPT on forest floor (1 ♂, UCRC).

This male is not given paratype status because its specific identity is uncertain. Conspecific females from American Samoa must be collected and compared with the Australian females to determine if they are the same.

Derivation of species name.

From Latin, longus, meaning long, and setosa, meaning bristly, referring to the long setae on the flagellum of the male and the mesosoma of the female. The name is treated as a noun in apposition.

Description.

Female. Body length 570-675 (n=2). Colour. Yellow; brown are trabecula, sockets of setae on mesosoma, and, especially, propodeum, and gaster dor sally and laterally in about apical half but anterior to cerci. Head. Width 174 (n=1). Vertex with two pairs of fairly short setae, eye orbit dorsally with three long setae, one posteriorly and two anteriorly. Antenna. Fl1 the shortest segment (Figs 43, 49, 58) and without mps, the remaining segments each with 1 mps; clava with 4 mps. Measurements (n=2 or 1): scape length/width 167 –168/29– 32, pedicel 59 –64/22– 28, fl1 24 /14, fl2 36 –37/22– 23, fl3 39 –42/27– 28, fl4 36-39/24, fl5 44-46/26, fl6 46-49/30, fl7 44-47/32, clava 119-125/54. Mesosoma. Mesoscutum with 2 long, stout bristles on anterior part of median lobe and 1on lateral lobe (Figs 45, 50, 55); scutellum with 2 long, diverging setae near transscutal articulation; axilla with 1 shorter seta; propodeum without carinae but with small tubercles medially and with reticulate sculpture laterally, with propodeal seta near posterolateral corner. Metasoma. Petiole strongly reticulate; gaster in dorsal view with anterior surface of gt1 vertical and less than 0.1 × length of gaster, in lateral view lateral panel of gt1 covering more than 0.5 length of gaster; gt2 dorsally covering over half gaster length and with 2 long dorsal setae; re maining terga short; cercus with long setae, the longest almost 3 × cercal length. Ovipositor slightly projecting beyond gastral apex.

Male. Body length 535 µm (n=1). Flagellar segments with uneven edges and varying widths, apparently with 1 mps on each segment; fl11 distinctly narrower than fl10. Measurements of length/width (n=1): scape length/width 138/23, pedicel 50/25, fl1 25/13, fl2 55/13, fl3 60/13, fl4 53/18, fl5 55/13, fl6 58/15, fl7 55/18, fl8 63/25, fl9 43/25, fl10 43/23, fl11 43/10; total flagellum length about 350; flagellomeres each with a whorl of 4 setae usually at least twice length of segment.

Relationships.

Chrysoctonoides and Chrysoctonus may be sister genera though there are still considerable structural differences between them, especially in the mesosoma. Features that suggest a sister group relationship are: females apterous whereas males macropterous, wing shape in males identical, with long venation, antennal (especially funicle) and gastral structure in females very similar. Mathot (1966) had suggested that Chrysoctonus had the greatest affinity with Ooctonus , but did not say why. We tentatively concur with that proposed relationship on the basis of the similar structure of the metasoma. Both have a tubular petiole and well-sclerotized (non-collapsing) gaster with large gt1 and gt2. The presence of a group of several setae anterolaterally on gt1 (Figs 14, 16) in Chrysoctonus , as in Ooctonus , is particularly striking. A large fenestra occupies most of the scutellum in males and females of Ooctonus but in Chrysoctonus and Chrysoctonoides only the male has a large fenestra whereas the females of both genera have an oval fenestra, in Chrysoctonoides relatively smaller than in Chrysoctonus , positioned posterior to the scutellar setae and almost as wide as the distance between them (Figs 45, 59). Chrysoctonoides females also lack the lateral cluster of setae on gt1.