Labena humida Gauld, 2000

Marinho, Luana S. & Fernandes, Daniell R. R., 2025, Taxonomy of Labena Cresson, 1864 (Hymenoptera: Ichneumonidae: Labeninae) from Brazil, with description of two new species, Zootaxa 5660 (1), pp. 1-52 : 32-35

Labena humida Gauld, 2000

Figs. 42−43

Labena humida Gauld, 2000: 363 ; Yu et al., 2016 [database on flash-drive]. Holotype ♀, Costa Rica (INBio) [original designation].

Examined material (1♀). BRAZIL, Pará, Santarém, / BR163, KM 19, Ramal das / Lavras , Sítio Recanto do Sabiá , / S 02º35’13.0”, W 54º43’15.3, 01- / 15.X.2019, M.L. Oliveira leg. [collectors] / {Trap} Malaise grande {Gressitt & Gressitt}, Rede BIA (1♀, INPA) .

Diagnosis. This species can be distinguished from other Neotropical Labena species by a combination of the following characters: propodeum with a delineated anteriorly and weakly posteriorly outlined, large, area superomedia square; median tibia with scattered slender setae on the outer surface.

Remarks. Additional characters from the material examined from the states of Pará ( Brazil). Body length 10.9 mm, except ovipositor. Overall coloration reddish yellow ( Figs. 42A–D ). Head ( Figs. 42B–C ). Transverse black band between the occipital carina and occiput; transverse black band on ocelli, extending to lateral frons. Antenna with 41 flagellomeres, measuring 7.09 mm, with cylindrical apex; flagellum dark brown, flagellomeres I and II yellow ventrally. Mandible bidentate with a striate base, the upper tooth larger than the lower tooth; mandible basal width 0.32 mm. Malar space width 0.14 mm. Ocellus diameter 0.43 mm; distance between anterior and posterior ocellus 0.08 mm; shortest distance between posterior ocellus and compound eye 0.18 mm; distance between posterior ocelli 0.17 mm. Compound eye length 1.55 mm. Face weakly convex, finely punctate with fine and sparse setae, width 0.99 mm. Face weakly striate, width 0.70 mm. Wing. Fore wing length 9.65 mm, hyaline with a light brown spot at apex; areolet shorter than the length of distal abscissa of M, with 3rs-m slightly shorter than 2rs-m. Hind wing length 6.17 mm. Mesosoma ( Fig. 42E ). Mesoscutum with black border, with three longitudinal black bands. Pronotum without epomia, with upper posterior part punctate and with dense setae. Propleura punctate and with dense setae. Scuto-scutellar groove black, shallow, smooth. Scutellum slightly convex, punctate with dense setae, yellow with black posterior part. Metanotum (postscutellum) with black posterior part. Propodeum with anterior part with a black transverse band extending laterally to ⅓ of total length of propodeum; area basalis rectangular, wider than long, completely black; area externa as wider as long, with black diagonal spot; area dentipara without spot, not confluent with area postero-externa; area postero-externa with dark brown spot; area petiolaris obliterated by lateromedian longitudinal carina, with upper part black; area superomedia slightly longer than wide, with anterior transverse carina very outlined, posterior transverse carina weakly outlined; lateral longitudinal carina complete. Fore legs with one tibial spur, tarsomeres with fringe of apical setae; mid legs with medially dilated tibiae, with two tibial spurs and scattered thin setae on the outer surface; hind legs thin, not medially dilated, with darker tibiae and tarsomeres, with two tibial spurs. Metasoma. Tergite I 1.59 mm in length, basal width 0.64 mm and apical width 0.38 mm; tergite II 1.15 mm in length, basal width 1.06 mm and apical width 0.85 mm; tergite III 0.79 mm in length, basal width 1.60 mm and apical width 1.31 mm. Metasoma yellow with tergite I yellow, with a reddish-yellow central spot; tergite II anteriorly reddish-yellow and posteriorly yellow. Ovipositor laterally compressed, apex tapering; upper valva with marked and sparse teeth and marked transverse striae at apex; lower valva with marked proximal teeth and marked transverse striae at the apex.

Distribution. Costa Rica, Brazil ** (Pará*) ( Fig. 43 ) (Gauld 2000; Yu et al. 2016).

Discussion. Labena humida is morphologically similar to L. zerita Gauld, 2000 in having very weakly convex, smooth and non-sculpted metapleuron, with evenly expanded submetapleural carina, armed anteriorly, pleural carina absent anteriorly so that area spiracularis is open externally, enclosing the area lateralis. However, L. humida differs in that it is smaller and the carinae of the propodeum such as the area dentipara and area postero-externa are separated from each other, and the area petiolaris is obliterated by the lateromedian longitudinal carina. L. zerita , on the other hand, differs by being larger, and the confluent propodeum with area petiolaris, area dentipara, and area postero-externa. This species belongs to the grallator species group.

Figures

FIGURE 42. A–F. Female of Labena humida Gauld, 2000. A. Habitus, lateral view; B. Head, dorsal view; C. Head, front view; D. Habitus, dorsal view; E. Propodeum, dorsal view; F. Apex of ovipositor, lateral view.

FIGURE 43. Distribution of Labena humida Gauld, 2000 (yellow star= type locality, blue triangle= previous record, red circle= new record.