Toxidium inusitatum, Groll, 2025

Toxidium inusitatum sp. nov.

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

Figs 1A–B View Fig , 77–79 View Fig View Fig View Fig

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 View Fig )

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 View Fig ).

HEAD. Frons sparsely punctate and pubescent; punctation fine, with some punctures coarser and sparsely distributed. Antennomeres elongate ( Fig. 77H View Fig ); 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 View Fig ). Hypomeron with punctures very fine and pubescence sparse ( Fig. 77B View Fig ). Prothoracic carina sinuous in lateral view ( Fig. 77B View Fig ). Posterior angles of pronotum not acute and not reaching anapleural lines ( Fig. 77B View Fig ).

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

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

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

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

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

Male

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

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

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 View Fig ).