Discleroderma dolium Azevedo, Vargas & Colombo, 2020

Azevedo, Celso O., Vargas, Juan M. & Colombo, Wesley D., 2020, Synopsis of world Discleroderma Kieffer (Hymenoptera, Bethylidae), Zootaxa 4742 (3), pp. 467-480 : 476

Discleroderma dolium Azevedo, Vargas & Colombo , sp. nov.

Fig. 4 A–D

Description, female. Body 2.74 mm long. Forewing 1.54 mm long. LH 0.48 mm. WH 0.48 mm. WF 0.29 mm. HE 0.22 mm. WOT 0.12 mm. OOL 0.14 mm.

Color. Head dark castaneous, clypeus castaneous, antenna dark castaneous dorsally and castaneous ventrally, mandible dark castaneous, progressively castaneous distad, palpi light castaneous. Mesosoma dark castaneous, legs somewhat dark castaneous, tarsi light castaneous, forewing subhyaline, hind wing hyaline, veins light castaneous. Metasoma dark castaneous, anterior area of sternites distinctly lighter.

Head. Head barrel-shaped in dorsal view, lateral margin outcurved, wider at eye level, vertex outcurved. Gena not visible in dorsal view. Malar space large, about as long as proximal mandibular width. Malar sulcus absent, anterior clypeal margin slightly thicker. Mandible with dorsal margin straight, ventral margin incurved. Pedicel about 3.0 × as long as flagellomere I; mid flagellomeres wider than longer. Frontal angle of ocellar triangle acute. Anterior margin of anterior ocellus touching supra-ocular line. WH 1.0 × LH; WF 0.61 × WH; WF 1.36 × HE; OOL 1.13 × WOT. Intertorular space less than torular diameter. Frons weakly coriaceous, punctures small, shallow and sparse. Frontal line carinate, very inconspicuous. Hypostomal carina conspicuous, evenly arched, not angulate medially. Occipital carina fully absent.

Mesosoma. Dorsum of thorax more coriaceous than frons, punctures mid-sized, shallow and somewhat dense. Pronotal flange short, surface subvertical. Anteromesoscutum medially longer than mesoscutellum. Notauli absent. Parapsidal signum complete, narrow, somewhat inconspicuous, slightly outcurved, converging posterad. Mesoscutum-mesoscutellar sulcus evenly and slightly arched posterad laterally, little dilated laterally. Metapectal-propodeal disc with transverse anterior, metapostnotal median, first metapostnotal lateral and transverse posterior carinae; first metapostnotal lateral carina straight, incomplete posteriorly and somewhat irregular, lateral margin straight, parallel, disc weakly rugulose between and around first metapostnotal lateral carinae, otherwise coriaceous-weakly coriaceous. First abdominal spiracle elliptical, located on dorsal surface of metapectal-propodeal disc, not intercepted by lateral carina. Propodeal declivity weakly coriaceous, without median carina. Lateral surface of metapectal-propodeal complex weakly coriaceous. Mesopleuron weakly coriaceous, transepisternal line present only anteriorly, central pit minute. Forewing with prestigmal abscissa of R1 0.67 × as long as Rs&M. Hind wing with one proximal hamulus and three distal hamuli not evenly spaced. Mesotibia strongly spinose.

Metasoma. Tergite III without any tubercle; tergites IV–V with pair of callus-shaped tubercles, connected by transverse carina. Inter-tubercular space 1.0 × outer-tubercular space for both metasoma segments IV and V.

Material examined. Holotype female, INDONESIA, Nceram {= North Ceram}, 9 km E Wahai, nr PHPA-Q coastal rainforest, 28.II–21.III.1997, Mal. trap 6, C. v. Achterberg & R. de Vries ( RMNH).

Etymology. The specific epithet dolium is a noun in apposition from Latin, which means barrel. It refers to the barrel-shaped head when seen in dorsal view.

Remarks. This species is similar to D. gundari by having the tubercles on the metasomal tergites IV–V callusshaped tubercles, and connected by transverse carina. However, this species has the head barrel-shaped, whereas D. gundari has the head converging anterad.

Figures

FIGURE 4. A–D. Discleroderma dolium sp. nov., ♀. A. Habitus; B. Head, dorsal view; C. Mesosoma, dorsal view; D. Metaso- mal process, lateral view. E–H. Discleroderma guamensis sp. nov., ♀. E. Habitus; F. Head, dorsal view; G. Mesosoma, dorsal view; H. Metasomal process, lateral view. Scales-bars: 200μm, except 500μm for A and E; 100μm for D and H.