Toxidium inusitatum sp. nov.

urn:lsid:zoobank.org:act: EB24CEF0-5780-4B6F-A5D2-6119AE21702A

Figs 1A–B, 77–79

Diagnosis

Body length: 1.45 mm. Brown. Posterior angle of pronotum not acute and not trespassing anapleural line; lateral carina sinuous. Metaventrite with coarse and dense punctures under anapleural lines and next to metanepisternal suture. Metanepisternum entirely hidden beneath elytra. Submesocoxal area short= 0.04 mm. Parameres of aedeagus oar-shaped in lateral view; sclerite of internal sac strongly curved.

Etymology

The species epithet is a Latin word meaning ‘unusual’, due to the distinct aedeagus shape.

Material examined

Holotype BRAZIL • ♂ *; Minas Gerais, Viçosa, EPTEA Mata do Paraíso; 12 Nov. 2019; LabCol leg.; “Falcon 01 / Em tronco pequeno caído com hifa indet. / Dissecado em 12.xi.2022 / HOLOTYPUS ♂”; CELC. (Fig. 77D–E)

Description

COLOURATION. Brown, ventral sclerites lighter near sutures; posterior half of clypeus, tip of elytra, coxae, femora, and tibiae ochreous; mouthparts, antennae, tarsi, and apex of each abdominal ventrite yellowish (Fig. 77A–C, F).

HEAD. Frons sparsely punctate and pubescent; punctation fine, with some punctures coarser and sparsely distributed. Antennomeres elongate (Fig. 77H); proportions: I 81/41: II 86/42: III 49/15:IV 79/13:V 93/14: VI 87/16:VII 113/24:VIII 84/20:IX 116/28: X 108/33: XI 137/42.

PROTHORAX. Pronotum with pubescence and punctures moderately dense (Fig. 77G). Hypomeron with punctures very fine and pubescence sparse (Fig. 77B). Prothoracic carina sinuous in lateral view (Fig. 77B). Posterior angles of pronotum not acute and not reaching anapleural lines (Fig. 77B).

MESOTHORAX. Tip of scutellum exposed (longer than wide). Mesanepisternum finely punctate, pubescence sparse. Secondary lines sinuous and connected to mesocoxal cavities (Fig. 77B).

METATHORAX. Metaventrite lacking microsculpture, shining, almost glabrous; densely and coarsely punctate under anapleural lines and next to metanepisternal suture (Fig. 78A). Submesocoxal lines parallel to coxae; submesocoxal area micropunctured and short, length: 0.04 mm (Figs 77B, 78A). Metanepisternum completely hidden under elytra (Figs 77B, 78A).

WINGS (Figs 77A–B, 78B). Elytra with coarse and moderately sparse punctures. Sutural striae shortened, extending from apex to about 0.80 of the elytral sutural length (Fig. 77A). Lateral striae impunctate, slightly curved at humeral region (Fig. 77B).

LEGS (Fig. 78C–D). Meso- and metafemora slender, with imbricate microsculpture.

ABDOMEN. Ventral surface smooth, shining, almost glabrous (Fig. 77B). Propygidium micropunctured and sparsely pubescent (Fig. 78E).

Male

Protarsomeres I–III widened, bearing tenent setae (Fig. 78C). Sternite VIII with a shallow posterior projection (Fig. 78F). Tergite VIII convex posteriorly (Fig. 78G). Tergite IX with curved ventral struts (Fig. 78H). Sternite IX oblong (Fig. 78I). Tergite X rounded curved (Fig. 78J).

AEDEAGUS (Fig. 79). Membranous. Median lobe lacking obvious divisions between apical lobe and basal bulb; apical lobe curved backwards (Fig. 79C). Parameres without sclerotized anterior portion (that connects to median lobe) and oar-shaped in lateral view (Fig. 79C). Sclerite of internal sac strongly curved (Fig. 79C).

MEASUREMENTS (n= 1, holotype; in mm). TL 1.46, SY 0.17, HW 0.44, WA 0.07, PL 0.61, PA 0.41, PB 0.74, EI 0.95, EL 0.99, EW 0.36, EH 0.46, MB 0.12, MC 0.04, ML 0.04, VL 0.17, PrF 0.35, PrT 0.29, MsF 0.42, MsT 0.33, MtF 0.52, MtT 0.43.

Host

Collected from a rotten small log, covered with undetermined hyphae.

Remarks

It is similar to T. ultimum sp. nov. but differs by the denser and coarser lateral punctures on the metaventrite and by the completely hidden metanepisternum. The aedeagus can be distinguished by the distinctly membranous median lobe, by the parameres shape, and the much longer sclerite of internal sac.

Distribution

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