Toxidium fleche sp. nov.

urn:lsid:zoobank.org:act: 5B5CBA25-EFEF-41D5-9504-1D7B293BFCBA

Figs 1A–D, 74– 76, 94E–F

Diagnosis

Body length: 1.90 mm. Dark brown. Dorsal surface pubescence very dense. Metaventrite coarsely punctate laterally. Metanepisternum triangular, wider next to the mesanepisternum. Aedeagus with parameres remarkably sinuous in lateral view. Sclerite of internal sac arrow-shaped.

Etymology

The species name is a French noun in apposition, meaning ‘arrow’, due to the arrow-shaped sclerite of the internal sac.

Material examined

Holotype BRAZIL • ♂ *; Minas Gerais, Viçosa, Mata da Biologia; 15 Oct. 2021; E. von Groll and A. Orsetti leg.; “Fungo 30 / Em Fungo branco ressupinado no tronco caído / Dissecado em 11.nov.2022 / HOLOTYPUS ♂”; CELC. (Fig. 74D–E)

Description

COLOURATION. Dark brown; clypeus, coxae, femora, and tibiae dark ochreous; antennae, mouthparts, tip of elytra, and apex of each abdominal ventrite yellow (Fig. 74).

HEAD. Frons with fine and dense punctures; pubescence dense; clypeus micropunctured. Antennomeres III–VI somewhat thicker, IX about 3.20 × as long as VIII, XI, oblong (Fig. 74H); proportions: I 115/38: II 101/45: III 58/18: IV 76/16:V 90/18:VI 88/18:VII 110/32:VIII 70/21: IX 110/33: X 115/35:XI 146/47.

PROTHORAX. Pronotum not strongly curved in lateral view; finely and densely punctate, pubescence dense (Fig. 74G). Posterior angles of pronotum slightly acute, reaching anapleural line (Fig. 74B).

MESOTHORAX. Tip of scutellum exposed (as long as wide)(Fig.74G). Mesanepisternum with inconspicuous punctation, pubescence sparse (Fig. 74B). Secondary lines straight, not connected to mesocoxal cavities (Fig. 74B).

METATHORAX. Metaventrite with conspicuous coarse punctures between submesocoxal lines and metanepisternal suture; almost glabrous (Figs 74B, 75A). Submesocoxal lines not sinuous; submesocoxal area with imbricate microsculpture; length: 0.09 mm (Fig. 75A). Metanepisternal suture curved anteriorly; metanepisternum triangular, wider next to the mesanepisternum (Fig. 75A).

WINGS. Elytra densely and coarsely punctate – coarser than pronotum; pubescence dense (Fig. 74A, G). Sutural striae not strongly shortened, extending from apex to approximately 0.82 of the elytral sutural length (Fig. 74A). Lateral striae impunctate, slightly curved at humeral region (Fig. 74B).

LEGS (Fig. 75C–D). With imbricate microsculpture.

ABDOMEN. Ventral surface shining, almost glabrous (Fig. 74B). Ventrite I with micropuncture in middle. Propygidium micropunctured (Fig. 75E).

Male

Protarsomeres I–III widened, bearing tenent setae (Fig. 75C). Sternite VIII elongate, with a shallowt posterior projection (Fig. 75F). Tergite VIII straight posteriorly (Fig. 75G). Tergite IX with ventral struts thick and slightly curved (Fig. 75H). Sternite IX oblong (Fig. 75I). Tergite X triangular and rounded posteriorly (Fig. 75J).

AEDEAGUS (Fig. 76). Median lobe slightly sclerotized; basal bulb longer than apical lobe; apical lobe bent in lateral view (Fig. 76B). Parameres remarkably wide and sinuous in lateral view (Fig. 76D). Sclerite of internal sac arrow-shaped (Fig. 76E–F).

MEASUREMENTS (n =1, holotype; in mm). TL 1.88, SY 0.20, HW 0.75, WA 0.11, PL 0.88, PA 0.52, PB 0.95, EI 1.20, EL 1.32, EW 0.55, EH 0.55, MB 0.12, MC 0.14, MeW 0.30, ML 0.09, VL 0.23, VL2 0.35, PrF 0.50, PrT 0.35, MsF 0.57, MsT 0.42, MtF 0.54, MtT 0.53.

Host

Collected from undetermined crust/resupinate fungus (Fig. 94E–F).

Remarks

Similar to T. robustum Pic, 1930 due to the dilatated parameres and the not curved sclerite of the internal sac. Nonetheless, T. fleche sp. nov. can be easily distinguished by the longer sutural striae and by the absence of the basal ones.

Distribution

Mata da Biologia, Universidade Federal de Viçosa, campus of Viçosa, state of Minas Gerais, Southeast Brazil (Fig. 1A–D).