Apsilocera cornuta Mitroiu

Mitroiu, Mircea-Dan & Achterberg, Cornelis Van, 2013, Revision of the Oriental species of Apsilocera Bouček (Hymenoptera, Pteromalidae), with description of twelve new species, Zootaxa 3717 (4), pp. 448-468 : 459-460

Apsilocera cornuta Mitroiu & van Achterberg, sp. n.

( Figs 3 , 14, 17 , 21 , 31 )

Type material. Holotype, ♀ (RMNH), “N. VIETNAM: Ninh Binh, Cuc Phuong N.P., nr entrance, c 225 m, 15.iv– 1.v.2000, Mal. tr. II, Mai Phu Quy, RMNH’00” (RMNH). Paratypes (1 ♀ and 1 ♂, IEBR, RMNH): 1 ♀ “S. VIETNAM: Dak Lak, Chu Yang Sin N.P., Krong K’Mar Mal. traps, 740–900 m, 2–10–vi.2007, C. v. Achterberg & R. de Vries, RMNH’07” (IEBR); 1 ♂ “N. VIETNAM: Ninh Binh, Cuc Phuong N.P., nr centre, c 225 m, 17.x– 18.xi.2000, Mai Phu Quy, RMNH’01” (RMNH).

Diagnosis. Both sexes with head slightly transverse in anterior view, with only one conspicuous tooth near each eye; clypeal margin slightly emarginate; each funicular segment with two rows of sensilla; clava brown; distal tooth of mandible sharp ( Fig. 21 ). Mesosoma dorsally arched; fore coxa black, mid and hind coxae pale yellow, the latter with a small dark spot basally; fore wing hyaline ( Fig. 3 ). Female and male metasoma dorsally pale at base, more extensively so in male ( Fig. 14 ); male antenna with each F having two verticils of long setae in basal half, F1 not distinctly shorter than F2 ( Fig. 17 ).

Description. Female holotype, body length: 2.25 mm. Colour ( Fig. 3 ): head black, with faint dark blue reflections; eyes reddish, ocelli light brown; scape, pedicel and anelli yellow, F and clava light brown; mandible light brown, teeth darker. Mesosoma dark olive green; fore coxa black, mid and hind coxae pale yellow, the latter with a small dark spot basally; all femora, tibiae and tarsi light yellow; wings hyaline; tegula and venation light brown. Metasoma brown, dorsally pale at base and more extensively pale ventrally and laterally.

Head slightly transverse in anterior view, with only one conspicuous tooth near each eye; vertex not high, almost flat between posterior ocelli; gena moderately receding towards mouth, not hollowed at mouth corner, but slightly depressed ( Fig. 21 ); temple short; occiput slightly emarginate ( Fig. 31 ); clypeal margin slightly emarginate; mandible formula 4:4, distal tooth sharp; each funicular segment with two rows of dense sensilla ( Fig. 21 ). Relative measurements—length: 28; width: 63; height: 51; POL: 11; OOL: 14; eye height: 30; eye length: 20; malar space: 13; mouth width: 26; distance between clypeal margin and toruli: 32; scape length: 26; pedicel length: 5; pedicel width: 3.5; pedicel plus flagellum: 70; F1 length: 7; F1 width: 5; F6 length: 8; F6 width: 5; clava length: 15; clava width: 5.

Mesosoma short, dorsally arched ( Fig. 3 ); suture between mesoscutum and scutellum deep; propodeum finely reticulate, alveoli very small; fore wing with basal cell bare, open below; basal vein pilose; ventral side of costal cell with one row of hairs, in distal part with a patch of hairs; speculum reaching proximal end of M; stigma slightly elongated ( Fig. 3 ). Relative measurements—length: 50; width: 44; height: 35; mesoscutum length: 19; scutellum length: 22; scutellum width: 22; fore wing length: 117; fore wing width: 55; M: 26; S: 12; P: 27.

Metasoma short ovate, longer than mesosoma ( Fig. 3 ); ovipositor sheaths short, not visible in dorsal view; tip of ovipositor serrate. Relative measurements—length: 70; width: 41; length of first tergite: 15; distance from base of metasoma to tip of hypopygium: 40.

Male paratype, body length: 2 mm ( Figs 14, 17 ). Similar to female, except antennae and metasoma.

Antenna longer and thinner, each F having two verticils of long setae in basal part, which is also darker than the distal part ( Figs 14, 17 ). Head relative measurements—length: 22; width: 50; height: 39; POL: 10; OOL: 11; eye height: 24; eye length: 16; malar space: 10; mouth width: 21; distance between clypeal margin and toruli: 27; scape length: 20; pedicel length: 4.5; pedicel width: 3; pedicel plus flagellum: 67; F1 length: 8; F1 width: 2.5; F6 length: 7; F6 width: 2.5; clava length: 15; clava width: 3.

Mesosoma relative measurements—length: 47; width: 35; height: 30; mesoscutum length: 17; scutellum length: 17; scutellum width: 20; fore wing length: 100; fore wing width: 47; M: 22; S: 9; P: 23.

Metasoma only slightly longer than mesosoma, oval, dorsally pale on about 2/3 its length ( Fig. 14 ). Relative measurements—length: 50; width: 31.

Variability. Not conspicuous in the available material.

Distribution. Vietnam.

Hosts. Unknown.

Etymology. From the Latin “ cornutus ” (with horns), which refers to the two conspicuous projections on the head.

Comments. Apsilocera cornuta belongs to a group of species having distinct teeth in the upper part of the head. This is the only Oriental species having only one tooth near each eye. It is very similar to the Papuan A. bidens , but the latter has a yellow clava and the mandible formula 3:4 (Bouček, 1988).

Figures

FIGURES 1 – 6. Apsilocera spp., female, holotype, lateral view. 1 A. acuticristata; 2 A. bicristata; 3 A. cornuta; 4 A. dentata; 5 A. dupla; 6 A. elongata.

FIGURES 13 – 18. Apsilocera spp., male, paratype, lateral view (13 – 15) and antennae (16 – 18). 13 A. bicristata; 14 A. cornuta; 15 A. maculata; 16 A. bicristata; 17 A. cornuta; 18 A. maculata.

FIGURES 19 – 24. Apsilocera spp., female, holotype, head in anterior view. 19 A. acuticristata; 20 A. bicristata; 21 A. cornuta; 22 A. dentata; 23 A. dupla; 24 A. elongata.

FIGURES 31 – 34. Apsilocera spp., female, holotype. 31 A. cornuta, head, dorsal view; 32 A. tuberculata, head, antero-ventral view; 33 A. fulvipennis, fore wing, dorsal side; 34 A. tuberculata, body, dorsal view.