Trigonopterus rostralis (Lea)

Riedel, Alexander & Taenzler, Rene, 2016, Revision of the Australian species of the weevil genus Trigonopterus Fauvel, ZooKeys 556, pp. 97-162: 138-139

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Trigonopterus rostralis (Lea)


Taxon classification Animalia Coleoptera Curculionidae

27. Trigonopterus rostralis (Lea)  

Idotasia rostralis   Lea, 1928: 155-156.

Trigonopterus rostralis   (Lea): Pullen et al. 2014: 271.

Diagnostic description.

Lectotype (Fig. 27a). Length 3.81 mm. Color black; legs and antenna ferruginous. Body subovate; in dorsal aspect and in profile with constriction between pronotum and elytron. Rostrum slender, dorsally with glabrous median carina; in basal half clothed with mesad directed, white, spatulate scales; subapically subglabrous, punctate, sparsely setose. Eyes large, in dorsal position. Pronotum large; disk separated from sides by distinct edge; disk subglabrous, densely punctate with minute punctures, posterolateral and anterolateral corner clothed with white scales; sides in anterior 1/3 clothed with white scales. Elytra subglabrous, punctate with minute punc tures; basal margin bordered by row of large punctures continued behind humeri. Legs. Profemur large; anterior face with white scales. Mesofemur and metafemur dorsally densely squamose with white scales, with distinct dorsoposterior edge. Abdominal ventrite 5 flat. Aedeagus (Fig. 27b) with body in basal half subparallel, widened in apical half; extended into acute median process; ductus ejaculatorius subapically with weak bulbus. Intraspecific variation. Length 3.22-3.81 mm. Female rostrum dorsally largely subglabrous, with sublateral rows of minute punctures; in basal 1/5 punctate-rugose, sparsely clothed with white scales.

Material examined.

Type specimens. Male, lectotype by present designation ( SAMA): Queensland, Torres Straits (labels Fig. 27e), ARC4037 (PCR failed). Female, paralectotype ( SAMA), same data as lectotype. Other specimens (QMBA, SAMA, SMNK): Queensland: 1 ex, 3 km ENE of Mt.Tozer, S12°44', E143°14', Malaise trap; 28-VI-04-VII-1986; 4 exx, 11 km ENE of Mt.Tozer, S12°43', E143°18', 5-10-VII-1986; 1 ex, 9 km ENE of Mt.Tozer, S12°43', E143°17', swept from undergrowth, 5-10-VII-1986; 4 exx, 9 km ENE of Mt.Tozer, S12°43', E143°17', 11-16-VII-1986; 2 exx, 9 km ENE of Mt.Tozer, S12°43', E143°17', Malaise trap, 11-16-VII-1986; 1 ex, 11 km ENE of Mt.Tozer, S12°43', E143°18', swept from undergrowth, 11-16-VII-1986; 1 ex, 11 km ENE of Mt.Tozer, S12°43', E143°18', ex yellow trays, 11-16-VII-1986; 2 exx, Claudie River, 4 km SW road junction, S12°44', E143°15', 04-XII-1986.


Queensland: Torres Strait, Iron Range N.P.


Swept and beaten from forest undergrowth.


Lea’s (1928) description is based on a male and a female specimen, and although Lea marked the male with a handwritten “TY” on its card, as he usually did to indicate the specimen he regarded to be the type, he did not designate it as the holotype in his description. This male is here designated as lectotype to ensure stability of nomenclature in case additional syntypes are discovered that belong to different species.