Trigonopterus analis Riedel

Riedel, Alexander & Narakusumo, Raden Pramesa, 2019, One hundred and three new species of Trigonopterus weevils from Sulawesi, ZooKeys 828, pp. 1-153 : 1

6. Trigonopterus analis Riedel sp. n.

Diagnostic description.

Holotype, male (Fig. 6a). Length 2.54 mm. Color of antennae and legs ferruginous; remainder black with slight bronze luster. Body subovate; in dorsal aspect with weak constriction between pronotum and elytron; in profile dorsally convex. Rostrum dorsally with median and pair of submedian carinae; intervening furrows with rows of erect yellowish scales; epistome indistinct, sparsely setose. Pronotum with disk densely, coarsely punctate; interspaces between punctures subglabrous, subequal or less than punctures´ diameter; sublaterally some punctures with clavate, yellowish scale; median line impunctate. Elytra irregularly punctate with small punctures; interspaces subglabrous; basal margin bordered by deeper punctures and almond-shaped yellowish scales; near apex striae more distinctly impressed, with sparse rows of yellowish scales; apex subtruncate. Femora with anteroventral ridge ending with blunt tooth; anterior surface coarsely punctate, each puncture with narrow yellowish scale. Metafemur with dorsoposterior ridge denticulate, subapically with stridulatory patch. Meso- and metatibia with dorsal edge irregularly serrate. Metatibia ventrally with fine ridge; subapically at base of uncus with fine pointed brush of long setae. Abdominal ventrites 1-2 concave, sublaterally behind metacoxa with patch of erect white scales; ventrite 5 concave, subglabrous, microreticulate, in basal 1/2 with median carina, apex curved ventrad forming thin bilobed lamina. Penis (Fig. 6b) with body differentiated into weakly sinuate inner frame and narrow lateral membranous lobes; converging towards weakly anchor-shaped apex; apodemes 1.8 × as long as body of penis; transfer apparatus hook-shaped, ca. 0.6 × length of body; ductus ejaculatorius without distinct bulbus. Intraspecific variation. Length 2.38-2.54 mm. Female rostrum slender, dorsally subglabrous, with submedian and sublateral rows of minute punctures. Female abdominal ventrite 5 simple, flat, with sparse scales.

Material examined.

Holotype (MZB): ARC3179 (EMBL # LN884969), SE-Sulawesi Prov., N Kolaka, Uluwolo village, 03°48.073'S 121°16.856'E, 182 m, sifted, 21-IV-2013. Paratype (SMNK): 1 ex, ARC3180 (PCR failed), same data as holotype.

Distribution.

SE-Sulawesi Prov. (Kolaka). Elevation ca. 180 m.

Biology.

In leaf litter of lowland forest.

Etymology.

This epithet is based on the Latin adjective analis, e (pertaining to the anus) and refers to the peculiar morphology of ventrite 5.

Notes.

Trigonopterus analis Riedel, sp. n. was coded as " Trigonopterus sp. 473". This species is very closely related to T. pseudanalis Riedel, sp. n., from which it differs by ca. 11.7-12.7% p-distance of cox1, by the apex of the penis, and by a more slender body shape with a less densely punctate pronotum.