Nipponosega lineata, Mita, 2021

Mita, Toshiharu, 2021, Taxonomic study of Baeosega and its allies, with description of a new species of Nipponosega (Hymenoptera, Chrysididae, Amiseginae), ZooKeys 1041, pp. 1-25 : 1

Nipponosega lineata sp. nov. Figures 1D , 7

Specimen examined.

Holotype. Thailand ♀ (THNHM-I-23985), "[NW Thailand] / Tak prov., / Umphang WS, / nr Pha Lueat stn.", "28. i 2015 / Sk. Yamane leg. / 390 m alt.; leaf /& surface soil", "Sk Yamane Collection" (THNHM).

Diagnosis.

Nipponosega lineata sp. nov. is readily distinguished from other Nipponosega species by the longitudinally costate pronotum (Fig. 7D ). Other characters useful to distinguish from other species are as follows: body length 2.8 mm; head black, punctate with interspaces smooth, posterior margin of vertex longitudinally costate (Fig. 7D ); maximum interocular distance 2.9 × longer than width of frons; lateral ocelli almost touching the inner margin of eye; malar sulcus indicated as a faint track (Fig. 7C ); outer orbit of eye with a row of punctures; occipital carina present (Fig. 7B, D ), reaching lower gena; antenna blackish with scape and F1 testaceous; mesosoma reddish but dorsum largely black; mesoscutum and mesoscutellum punctate; legs brownish; metasoma dark brown, smooth. Male is unknown.

Description.

Holotype female. Body length 2.81 mm. Head (Fig. 7A-C ) punctate except scapal basin and posterior margin of vertex, as long as wide in dorsal view, 0.82 × as wide as deep in frontal view; punctures 0.5-1.0 × MOD, 0.5-2.0, 2.0-3.0, and, 0.5-1.0 punctures diameter apart on frons, ocellar region and vertex, respectively; interspaces among punctures smooth; scapal basin moderately excavated, transversely costate by fine grooves, upper part with short median unsculptured line; malar sulcus indicated as faint track; frons narrow, shortest distance between eyes 0.23 × head width; maximum interocular distance 2.9 × as long as narrowest width of frons; MS 0.23 × as long as eye height; outer orbit of eye with a row of deep punctures; ocellar triangle acute, lateral ocelli almost touching inner margin of eye; OL 1.3, OPL 2.2, POL 1.0, OOL 0.2, MOD 0.3; posterior margin of vertex longitudinally costate; occipital carina present, reaching gena. Clypeus thickened. Mandible without inner tooth, cylindrical. Antenna stout, F4-F9 wider than long; length (width) of F1 to F4 following ratio: 5.8 (1.5): 1.8 (1.7): 1.8 (1.8): 1.5 (2.0).

Pronotum (Fig. 7D ) longitudinally costate by fine grooves except anterior narrow region smooth with several punctures; medial longitudinal line reaching 3/4 of pronotum; length of pronotum measured mesad 0.89 × as long as wide, 1.6 × mesoscutum plus mesoscutellum. Mesoscutum roughly punctate-reticulate: punctures as long as or slightly smaller than MOD; notauli complete, diverging anteriorly. Mesoscutellum punctate as mesoscutum, 0.59 × longer than mesoscutum. Mesopleuron punctate with smooth interspaces: punctures as long as MOD. Metanotum triangular, as long as mesoscutellum mesad, punctate. Propodeum (Fig. 7D ) with postero-lateral corner rounded; dorsal surface long, smooth, transversely rugose; posterior surface transversely rugose; lateral surface obliquely rugose; metapleural region smooth but behind meso-metapleural suture costate. Middle and hind coxae transversely costate.

Metasoma smooth, covered with sparse setae; setae 2.5 × MOD.

Color. Head black. Antenna basally testaceous with distal apex of scape and pedicel dark brown, F2-F10 black. Mandible brown. Mesosoma reddish but following parts blackish: dorsal surface of pronotum, anterior 2/3 of propleuron, mesoscutum, mesoscutellum, ventral surface of mesepisternum, median enclosure of metanotum, postero-dorsal surface of propodeum. Tegula and wings brown. Coxae whitish with postero-dorsal dark spot; trochanters testaceous; fore femur brown with basal and distal parts testaceous; middle and hind femora brown with basal parts testaceous; tibiae brown with basal parts of fore and hind tibiae testaceous; tarsi testaceous with fore and hind tarsi basally brownish. Metasoma dark brown with anterior surface of T1 and S1 paler.

Distribution.

Thailand (Tak Province).

Etymology.

The specific name derives from the Latin word Nipponosega lineata , referring to the presence of striae on the pronotum.

Remarks.

The holotype was collected from the leaf litter.

Figures

Figure 1. General habitus of Amiseginae A Baeosega humida Krombein, holotype ♀ B B. torrida Krombein, holotype ♀ C ditto, allotype ♂ D Nipponosega lineata sp. nov., holotype ♀. Scale bars: 1.0 mm.

Figure 7. Nipponosega lineata sp. nov., holotype ♀ A head in frontal view B ditto, dorsal view C ditto, lateral view D vertex and mesosoma. Scale bars: 0.5 mm.