Trichrysis aliciae Wiśniowski, 2020

Wiśniowski, Bogdan, Lien, Nguyen Thi Phuong & Cuong, Nguyen Quang, 2020, Discovery of four new species of Trichrysis Lichtenstein, cyanea species group (Hymenoptera, Chrysididae) from Vietnam, Zootaxa 4881 (1), pp. 165-178 : 166-169

Trichrysis aliciae Wiśniowski , sp. nov.

Material examined. Holotype, ♀: / VIET NAM; Tuyen Quang, Na / Hang NR; 10.vi.2017; MT, [leg.] KDL/

Diagnosis. Middle sized species with slender, densely punctate mesosoma, and green-golden-blue colouration of body. Sublateral, longitudinal carina on pronotum developed only in anterior part in form of anterolateral angles, absent in posterior half. Tegula dark-violet, metallic. T1 and T2 dark blue dorsally, golden-green laterally. T3 with sharp apical teeth, pits distinct, of variable size. S2 spots joining to form quadrilateral mark; mark longer than wide.

Description. Female. Holotype. Body length 6.0 mm ( Fig. 1 ).

Head. Scapal basin concave, moderately deep, punctate, in upper part with small polished area. Brow prominent; TFC single, only laterally with traces of second carina, slightly outcurved, its length about 2/3 of brow: area below TFC polished, turning into elongated punctures toward scapal basin ( Fig. 2 ). Brow above TFC flattened, with dense punctures. BOL 1.9 × MOD. Relative length of P:F1:F2:F3=1.0:1.3:0.8:0.7; F1 l/w=2.6; OOL 1.6 × MOD; POL 1.7 × MOD; MS 1.3 × MOD; clypeus slightly incised medially, rather flattened in lateral view. Mandible without subapical tooth. Malar space with large, polished punctures, their diameter 0.7–1.0 × MOD, genal carina reaching up to 2/3 of height of head; carina branching at margin of compound eye. Setae on vertex whitish, longer than MOD. Ocellar triangle obtuse, densely punctured ( Fig. 3 ).

Mesosoma. Median pronotal line shallow, not reaching posterior margin of pronotum; sublateral carina incom-plete, anterior part as anterolateral angle, faint in posterior half. Punctation on pronotum, mesoscutum and mesoscutellum dense, interspaces narrow 0.1–0.4 × PD, shining and micropunctate. Interspaces on mesonotum partly blackish. Mesepisternum with large punctures, interspaces narrow, mostly 0.1–0.3 × PD. Episternal sulcus and especially scrobal sulcus with large areolate punctures, about 2.0 × as large as punctures on mesepisternum ( Fig. 1 ). Setae on outer edge of metatibia as long as their distal width.

Metasoma. Metasoma punctate; punctures smaller than on mesosoma. Interspaces 0.8–1.2 × PD, polished, with only scattered tiny punctures. T1 and T2 dark blue dorsally, golden-green laterally. T1 with short median groove anteriorly, T2 with weak median carina, reaching apical edge ( Fig. 4 ). T3 prepit bulge slightly convex ( Fig. 1 ); pit row distinct, pits separated, of variable size; post pit row area flat and punctate ( Fig. 6 ). Apex of T3 with three sharp teeth; median tooth distinctly curved downwards, with polished median carina. Interval between median tooth and lateral tooth circularly incurved ( Fig. 6 ). S2 black spots fused medially, forming quadrilateral mark, with small golden triangular area anteriorly; mark longer than wide ( Fig. 5 ).

Colouration. Body metallic blue and green with some golden parts, mostly ventrally. Green on face, some parts of pronotum, sides of mesosoma, lateral parts of terga as well as T2 and T3 apically; blue colour on vertex, anterior part of pronotum, central part of mesoscutum (here small black spot anteriorly), mesoscutellum, and metanotum medially; pleuron green with some golden colour, dorsal part of metasoma mostly blue, with green sides; T3 blue anteriorly, becoming golden-green dorsally, with two well defined blue spots in distal part, separated from pit row by green area ( Fig. 6 ). Pit row with bluish hint, pits light brown, anal teeth green. Sterna golden green, with blue reflections. Ocellar triangle with black interspaces. Scape and pedicel metallic bluish-green; F1 basally with metallic shimmer, greenish to blue, blackish distally; rest of flagellum black. Legs bright green, prolegs little golden; all tarsi brown. Some black colour around ocelli and on mesonotum. Tegula dark violet/purple, metallic. Wings dimmed.

Male. Unknown.

Distribution. North-eastern Vietnam (Tuyen Quang Province).

Remarks. Trichrysis aliciae sp. nov. is similar to T. coeruleamaculata Rosa, Wei & Xu, 2016 but is easy to distinguish by following characters: mesosoma dorsally with dense punctuation, interspaces 0.1–0.4 × PD (versus 0.2 –1.0 × PD in T. coeruleamaculata ), pits on T3 of variable size, from small to large, post-pit area punctate (versus large pits, post-pit area with sparse punctures in T. coeruleamaculata ), T2 and T3 golden-green laterally (versus blue in T. coeruleamaculata ). T. aliciae sp. nov. may be distinguished from T. kylan sp. nov. described below by following characters: black mark on S2 longer than wide (versus 1.2 × wider than long in T. kylan sp. nov.), F1 only basally with metallic shimmer, blackish distally (versus F1 fully metallic green in T. kylan sp. nov.), OOL 1.6 × MOD; POL 1.7 × MOD; MS 1.3 × MOD (versus OOL 2.0 × MOD; POL 2.3 × MOD; MS 1.6 × MOD in T. kylan sp. nov.).

Etymology. The specific name is dedicated to my mother, Alicja Wiśniowska, for her care and support.

Figures

FIGURES 1–3. Trichrysis aliciae sp. nov., holotype ♀. 1. Habitus, lateral view. 2. Head, frontal view. 3. Head, dorsal view. Scale bar = 0.5 mm.

FIGURES 4–6. Trichrysis aliciae sp. nov., holotype ♀. 4. Metasoma (T1 and T2), dorsal view. 5. S2, ventral view. 6. T3, dorsal view. Scale bar = 0.5 mm.