Toxidium fleche, Groll, 2025

Toxidium fleche sp. nov.

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

Figs 1A–D View Fig , 74– 76 View Fig View Fig View Fig , 94E–F View Fig

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 View Fig )

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 View Fig ).

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 View Fig ); 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 View Fig ). Posterior angles of pronotum slightly acute, reaching anapleural line ( Fig. 74B View Fig ).

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

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

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

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

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

Male

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

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

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 View Fig ).

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 View Fig ).