Toxidium scalenum sp. nov.

urn:lsid:zoobank.org:act: 94F752A7-DBE6-490C-A3CF-2BEEC58756F0

Figs 1A–B, 80–82

Diagnosis

Body length: 1.90 mm. Reddish-brown; legs ochreous. Sutural striae extending from apex to approximately 0.74 of the elytral sutural length. Posterior angle of pronotum not reaching anapleural line. Submesocoxal area and anterior area of metaventrite with strigulate microsculpture. Metanepisternum conspicuously wider next to the masanepisternum. Sclerite on internal sac of aedeagus J-shaped, long side 2.5× as long as short side.

Etymology

The species epithet is the Latin adjective, meaning ‘scalene’, referring to the metanepisternum’s scalene triangular shape.

Material examined

Holotype BRAZIL • ♂ *; Minas Gerais, Viçosa, EPTEA Mata do Paraíso; 17 Mar. 2022; E. von Groll et al. leg.; “Falcon 12 / Em Fungo branco ressupinado no tronco caído / Dissecado em 11.nov.2022 / HOLOTYPUS ♂”; CELC. (Fig. 80D–E)

Description

COLOURATION. Reddish-brown, redder near sutures; shining; posterior area of clypeus, coxae, femora, and tibiae ochreous; antennae, mouthparts, tip of elytra, tarsi, and apex of abdominal ventrites yellow (Figs 80A–C, 81A–F).

HEAD. Frons with punctures dense and fine – few coarser punctures near frontoclypeal suture; pubescence dense (Fig. 80F).Antennomeres IV–VI distinctly slender (Fig. 80H), proportions: I 114/50: II 106/50: III 72/16: IV 86/13:V 103/11:VI 98/13:VII 117/27: VIII 88/23: IX 116/34: X 114/38:XI 143/46.

PROTHORAX (Fig. 80A–C, G). Somewhat elongate, smooth. Pronotum fine and moderately dense punctate. Lateral carinae dashed, visible in lateral view (Fig. 80B). Hypomeron with punctures very fine and poorly pubescent (Fig. 80B). Posterior angles of pronotum slightly acute, and not reaching anapleural line (Fig. 80B).

MESOTHORAX. Tip of scutellum exposed, slightly longer than wide (Fig. 80G). Mesanepisternum finely punctate; pubescence sparse (Fig. 80B). Mesoventral lines slightly curved, secondary lines straight (Fig. 81A).

METATHORAX.Metaventrite with imbricate microsculpture between submesocoxal lines and metanepisternal suture; almost glabrous and impunctate (Fig. 81D). Submesocoxal lines punctate; submesocoxal area imbricate microsculptured; length: 0.10 mm (Fig. 81A). Metanepisternum triangular; conspicuously wider next to the mesanepisternum, pubescence denser near metanepisternal suture (Fig. 81A).

WINGS. Elytra with coarse punctures – coarser than pronotum –, pubescence moderately dense (Fig. 80A). Sutural striae shortened, extending from apex up to approximately 0.74 of the sutural length (Fig. 80A). Lateral striae impunctate, just slightly curved at humeral region (Fig. 80B).

LEGS (Fig. 81C–E). With imbricate microsculpture.

ABDOMEN. Shining. Ventrite I with micropuncture near submetacoxal bead (Fig. 81D). Propygidium micropunctured (Fig. 81F).

Male Protarsomeres I–III widened, bearing tenent setae (Fig. 81C). Sternite VIII with a posterior triangular projection (Fig. 81G). Tergite IX with ventral struts slightly curved (Fig. 81H). Sternite IX rounded posteriorly (Fig. 81I). Tergite X triangular, angulate posteriorly (Fig. 81J).

AEDEAGUS (Fig. 82). Poorly sclerotized. Basal bulb and apical lobe similar in length. Apical lobe triangular (Fig. 82). Parameres sinuous in lateral view (Fig. 82C). Sclerite of internal sac J-shaped, long side 2.5× as long as short side.

MEASUREMENTS (n =1, holotype; in mm). TL 1.90, SY 0.20, HW 0.81, IS 0.33, PL 0.84, PA 0.55, PB 0.98, EI 1.20, EL 1.26, EW 0.52, EH 0.58, MB 0.13, MC 0.16, MeW 0.30, ML 0.10, VL 0.25, VL2 0.37, PrF 0.50, PrT 0.35, MsF 0.56, MsT 0.46, MtF 0.59, MtT 0.55.

Host

Collected from an undetermined crust/resupinate fungus.

Remarks

Similar to T. fleche sp. nov. but differs mainly by the absence of coarse punctures on the metaventrite, the shallower elytral punctures, and by the bended sclerite of the internal sac.

Distribution

Mata do Paraíso, Universidade Federal de Viçosa, campus of Viçosa, state of Minas Gerais, Southeast Brazil (Fig. 1A–B).