Trigonopterus evanidus (Pascoe)

Riedel, Alexander & Taenzler, Rene, 2016, Revision of the Australian species of the weevil genus Trigonopterus Fauvel, ZooKeys 556, pp. 97-162: 117-118

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Trigonopterus evanidus (Pascoe)


Taxon classification Animalia Coleoptera Curculionidae

13. Trigonopterus evanidus (Pascoe)  

Idotasia evanida   Pascoe, 1872: 100.

Trigonopterus evanidus   (Pascoe): Pullen et al. 2014: 271.

Diagnostic description.

Male (ARC3662; Fig. 13e). Length 3.19 mm. Color black. Body subovate, almost without constriction between pronotum and elytron; in profile evenly convex. Rostrum with median costa and pair of submedian ridges; intervening furrows with rows of white scales; apical 1/3 rugose-punctate. Eyes with dorsal margin bordered by furrow. Forehead sparsely punctate. Pronotum with disk densely punctate with small punctures; interspaces not microreticulate; sides foveate; base medially weakly extended towards elytral suture. Elytra subglabrous, striae marked by very shallow lines; along base and humeri with row of large punctures; apex with dense rows of small shallow punctures. Legs. Femora microreticulate, punctate. Metafemur dorsally with elongate patch of dense white scales; posterior surface with ventral edge rimmed by costa and row of scales, with longitudinal furrow containing row of scales parallel to indistinct dorsoposterior edge. Mesotibia apically with uncus and larger premucro fused in basal half, diverging in apical half. Metatibia apically with uncus and small angular premucro. Abdominal ventrite 2 swollen, with posterior edge projecting, medially forming common cavity with ventrite 1; ventrite 5 concave, dull, microreticulate, punctate. Penis (Fig. 13f) with sides of body subparallel; apex with median triangular extension somewhat confluent with outline of apex; transfer apparatus short, dentiform, bordered by S-shaped sclerites; ductus ejaculatorius without bulbus. Female lectotype (Fig. 13 a–d). As male except: length 2.56 mm. Rostrum punctate-rugose, with weak median costa. Mesotibia apically with large uncus and much smaller premucro. Terminalia (Fig. 12b) with styli wide.

Material examined.

Type specimens. Female, lectotype by present designation (BMNH): Queensland, Wide Bay (labels Fig. 12d), ARC4080 (PCR failed). Other specimens (QMBA, SMNK): Queensland: 1 ex, ARC3660 (EMBL # LN888164), Brisbane, St. Lucia, S27°30.033', E152°59.562', 27 m, hand-collected from Mallotus   leaves, 20-XI-2013; 2 exx, ARC3661 (EMBL # LN888165), ARC3662 (EMBL # LN888166), Brisbane, St. Lucia, S27°30.033', E152°59.562', 27 m, hand-collected from Mallotus   leaves, 23-XI-2013; 1 ex, ARC3862 (EMBL # LN888246), Ventnor Site 1, FIT trap, S24°53.58', E151°19.98', 475 m, 01-X-05-XII-2013.


Queensland: Brisbane.


Collected from foliage in gardens and forests.


The lectotype here designated has a circular label reading “Holotype” fixed to its pin by staff of the BMNH, but Pascoe (1872) did not designate a holotype in the original description nor specify the number of specimens examined. As other syntypes may exist, we here designate the one in the BMNH as the lectotype to ensure stability of nomenclature in case additional syntypes are discovered that belong to different species.