Trigonopterus dimorphus Riedel

Riedel, Alexander, Taenzler, Rene, Balke, Michael, Rahmadi, Cahyo & Suhardjono, Yayuk R., 2014, Ninety-eight new species of Trigonopterus weevils from Sundaland and the Lesser Sunda Islands, ZooKeys 467, pp. 1-162: 25-26

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Trigonopterus dimorphus Riedel

sp. n.

Taxon classification Animalia Coleoptera Curculionidae

25. Trigonopterus dimorphus Riedel  sp. n.

Diagnostic description.

Holotype, male (Fig. 25a). Length 3.80 mm. Color of tarsi, tibiae and antennae ferruginous, remainder black. Body elongate; in dorsal aspect with marked constriction between pronotum and elytron; in profile dorsally evenly convex. Rostrum with median carina terminating on forehead and pair of submedian ridges; intervening furrows each with row of erect piliform scales; epistome with transverse, angulate ridge. Pronotum anterolaterally projecting, rounded; with subapical constriction; disk densely punctate, interspaces subglabrous; each puncture containing recumbent seta; disk with pair of submedian, shallow impressions. Elytra with striae weakly impressed, partly indistinct; intervals flat; punctation confused, more dense towards base, near basal margin punctures partly confluent; each puncture containing small recumbent seta; interspaces microreticulate; interval 7 swollen subapically, laterally weakly projecting; sutural interval at apex markedly swollen, forming pair of rounded apical protrusions. Anteroventral ridge of femora forming blunt tooth. Metafemur subapically with stridulatory patch. Abdominal ventrite 5 with broad impression, densely punctate, setose with erect setae. Penis (Fig. 25b) with sides of body subparallel; apex broadly rounded; transfer apparatus distinct, compact; apodemes 1.6 × as long as body; ductus ejaculatorius without bulbus. Intraspecific variation. Length 2.94-3.80 mm. Integument of males dull, microreticulate; females with punctures sparser and smaller, interspaces polished. Female rostrum dorsally with glabrous median costa bordered by submedian and sublateral pairs of furrows; epistome simple. Female elytra with lateral contour evenly convex to apex; male elytra with lateral contour at humeri subangulate, in straight line to apex. Female abdominal ventrite 5 flat.

Material examined.

Holotype (MZB): ARC0211 (EMBL # LM655433), West Java Prov., Mt. Halimun N.P., Citalahab, sample 2, S06°44.503', E106°31.550', 1200 m, 12-IX-2005. Paratypes (ARC, MZB, SMNK): W-Java Prov., Mt. Halimun N.P.: 3 exx, ARC0101, W-Java Prov., Mt. Halimun N.P., Citalahab, S06°44.503', E106°31.550', 1150 m, 20-21-IX-2004; 10 exx, ARC0212 (EMBL # LM655434), ARC0213 (EMBL # LM655435), same data as holotype; 1 ex, Citalahab, sample 1, S06°44.423', E106°31.738', 1100 m, 12-IX-2005; 2 exx, ARC0170, N Ciptarasa, sample 3, S06°49.867', E106°30.085', 1100 m, 19-IX-2005; 2 exx, ARC0216 (EMBL # LM655438), ARC0217 (EMBL # LM655439), Panguyangan, Mt. Talaga, ca.1000 m, 17-IX-2005.


W-Java Prov. (Mt. Halimun N.P.). Elevation: 1000-1200 m.


This epithet is a combination of the prefix di- (two, double) and the adjective derived from the Greek morphe (gestalt).


Trigonopterus dimorphus  Riedel, sp. n. was coded as " Trigonopterus  sp. 293".