Apsilocera bicristata 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 : 455-459

Apsilocera bicristata Mitroiu & van Achterberg, sp. n.

( Figs 2 , 13, 16 , 20 )

Type material. Holotype, ♀ (RMNH), “ INDONESIA: S Halmahera, 20 km S Payahe, Sagutora, Mal. trap 13, c 115 m, 18.ii–18.iii.1995, C. v. Achterberg, R. de Vries & Y. Yasir, RMNH’95”. Paratype (1 ♂, RMNH): same label data as holotype.

Diagnosis. Head slightly transverse in anterior view, with one discontinuous crest between anterior ocellus and posterior ones; clypeal margin rounded ( Fig. 20 ); each funicular segment with one row of sensilla; clava with only last two segments yellowish ( Fig. 2 ); distal tooth of mandible blunt ( Fig. 20 ). Mesosoma dorsally arched; fore coxa mainly dark, mid and hind coxae pale yellow, the latter with a medium dark spot basally; fore wing hyaline ( Fig. 2 ). Metasoma dorsally brown except small pale basal depression. Male antenna with one verticil of long setae on each funicular segment, F1 not shorter than F2 ( Fig. 16 ); male metasoma dorsally with large pale yellow spot occupying most of its length ( Fig. 13 ).

Description. Holotype, ♀, body length: 2.2 mm. Colour ( Fig. 2 ): head black, with slight olive green metallic reflections; eyes reddish, ocelli whitish; scape reddish-yellow in distal half, pale yellow proximally; pedicel reddish-yellow, dorsally darker; flagellum brown except last two claval segments pale yellow; mandible reddishyellow, teeth reddish-brown. Mesosoma as head; wings hyaline; tegula and venation brown; fore coxa mainly dark, mid and hind coxae pale yellow, the latter with a medium dark spot basally; trochanters, proximal half of femora, and tibiae pale yellow; distal half of femora brown; tarsi yellow, tips brown. Metasoma dorsally brown; first tergite with a small yellowish depression at base; ventral and lateral sides of metasoma yellowish at base; ovipositor sheaths brown.

Head slightly transverse in anterior view, with one discontinuous crest between anterior ocellus and posterior ones; clypeal margin rounded; gena moderately receding towards mouth, not hollowed at mouth corner ( Fig. 20 ); temple absent; occiput slightly emarginate; each funicular segment with one row of dense sensilla ( Fig. 2 ); mandible formula 4:4, mandible large, distal tooth blunt ( Fig. 20 ). Relative measurements—length: 25; width: 55; height: 46; POL: 11; OOL: 11; eye height: 24; eye length: 19; malar space: 12; mouth width: 25; distance between clypeal margin and toruli: 31; scape length: 26; pedicel length: 5.5; pedicel width: 3.5; pedicel plus flagellum: 62; F1 length: 7; F1 width: 4; F6 length: 6; F6 width: 4; clava length: 15; clava width: 4.

Mesosoma arched ( Fig. 2 ); propodeum almost smooth, but with some longitudinal rugae; fore wing with basal cell bare, open below; basal vein with double row of hairs; ventral side of costal cell with one row of hairs, and a few additional hairs in distal part; speculum reaching proximal end of M; stigma elongated ( Fig. 2 ). Relative measurements—length: 50; width: 40; height: 33; mesoscutum length: 19; scutellum length: 18; scutellum width: 20; propodeum length: 7; fore wing length: 113; fore wing width: 48; M: 27; S: 14; P: 28.

Metasoma short ovate ( Fig. 2 ); basal tergite with small depression at base; ovipositor sheaths not visible in dorsal view. Relative measurements—length: 68; width: 39; length of first tergite: 23; distance from base of metasoma to tip of hypopygium: 50.

Male paratype, body length: 1.5 mm ( Figs 13, 16 ). Similar to female, except antennae and metasoma.

Antenna longer and thinner, each F having one verticil of long setae in basal third, which is also darker than the distal part ( Figs 13, 16 ). Head relative measurements—length: 18; width: 41; height: 34; POL: 8; OOL: 8; eye height: 17.5; eye length: 14; malar space: 8.5; mouth width: 19; distance between clypeal margin and toruli: 23; scape length: 20; pedicel length: 4.5; pedicel width: 2.5; pedicel plus flagellum: 56; F1 length: 6; F1 width: 2.5; F6 length: 5.5; F6 width: 2; clava length: 14; clava width: 2.5.

Mesosoma relative measurements—length: 39; width: 30; height: 26; mesoscutum length: 16; scutellum length: 15; scutellum width: 17; fore wing length: 85; fore wing width: 38; M: 19; S: 10; P: 20.

Metasoma shorter than mesosoma, oval; dorsal side with large pale yellow spot occupying most of metasoma length; lateral and ventral sides extensively pale yellow ( Fig. 13 ). Relative measurements—length: 35; width: 28.

Distribution. Indonesia.

Hosts. Unknown.

Etymology. The name is derived from the Latin words “ bis ” (twice) and “ cristatus ” (crested), and refers to the two distinct crests present on the head.

Comments. Apsilocera bicristata belongs to a group of species having conspicuous crests on the vertex. It most closely resembles A. longicornis and A. obtusicristata . From both species it differs in having the last two claval segments pale yellow ( Fig. 2 ). In addition, from A. longicornis it differs mainly in having all F with only one row of sensilla ( Fig. 2 ), and from A. obtusicristata mainly in having the distal tooth of the mandible blunt ( Fig. 20 ).

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.