Trigonopterus ovatulus Riedel

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

58. Trigonopterus ovatulus Riedel sp. n.

Diagnostic description.

Holotype, male (Fig. 58a). Length 1.98 mm. Color of antennae and tarsi ferruginous; tibiae and femora dark ferruginous; remainder black. Body subovate; in dorsal aspect with weak constriction between pronotum and elytron; in profile dorsally convex. Rostrum dorsally with median costa and pair of submedian ridges, weakly microreticulate; intervening furrows with sparse rows of piliform, recumbent scales; epistome in apical 1/3 indistinct, weakly swollen, subglabrous, sparsely setose. Pronotum with disk punctate with small punctures; interspaces subglabrous, weakly microreticulate. Elytra with striae marked by rows of small punctures; intervals subglabrous; near base with few additional, slightly larger punctures. Femora with anteroventral ridge distinct, ending in apical 1/3 with small blunt tooth; anterior surface densely punctate, microreticulate, each puncture with narrow recumbent scale. Metafemur subapically with extensive stridulatory patch. Metatibia with dorsal edge weakly denticulate, with small supra-uncal spine. Abdominal ventrites 1-2 weakly concave, subglabrous; ventrite 5 with shallow impression, densely punctate, covered with suberect scales, scales larger sublaterally. Penis (Fig. 58b) with body subparallel, apex with subangulate extension, without setae; apodemes 2.3 × as long as body of penis; transfer apparatus complex, asymmetrical, with subrotund capsule; ductus ejaculatorius without bulbus. Intraspecific variation. Length 1.75-2.34 mm. Female rostrum dorsally with submedian row of punctures, with sublateral furrow. Femora with anteroventral ridge ending with small blunt tooth or rounded.

Material examined.

Holotype (MZB): ARC2990 (GenBank # MK260608), S-Sulawesi Prov., Tanah Toraja, Rantepao, Gn. Karre (= Gn. Wokim), 02°59.021'S 120°02.523'E, 1456 m, beaten, 06-V-2013. Paratypes (MZB, SMNK): S-Sulawesi Prov.: 10 exx, ARC2991 (GenBank # MK260607), ARC2992 (GenBank # MK260624), ARC3000 (GenBank # MK260611), same data as holotype; 1 ex, ARC6027 (GenBank # MK260609), Tanah Toraja, Rantepao, Gn. Karre (= Gn. Wokim), 02°59.021'S 120°02.523'E, 1456 m, sifted, 06-V-2013; 2 exx, Tanah Toraja, Rantepao, Gn. Karre (= Gn. Wokim), 02°59.013'S 120°02.251'E, 1423 m, beaten, 06-V-2013; 3 exx, ARC6037 (GenBank # MK260621), ARC6038 (GenBank # MK260619), ARC6039 (GenBank # MK260618), Tanah Toraja, Rantepao, Gn. Karre (= Gn. Wokim), 02°58.846'S 120°02.158'E, 1396 m, beaten, 06-V-2013; C-Sulawesi Prov.: 46 exx, ARC2856 (GenBank # MK260615), ARC2857 (GenBank # MK260612), ARC2858 (GenBank # MK260616), ARC2859 (GenBank # MK260617), ARC2862 (GenBank # MK260622), Pendolo, Gn. Sampuraga, 02°12.476'S 120°45.506'E, 1050 m, beaten, 31-V-2012; 50 exx, ARC6044 (GenBank # MK260623), ARC6045 (GenBank # MK260620), Pendolo, Gn. Sampuraga, 02°12.165'S 120°45.567'E to 02°12.308'S 120°45.544'E, beaten, 934-1011 m, 13-V-2013; 3 exx, ARC3100 (GenBank # MK260614), ARC3101 (GenBank # MK260613), ARC3102 (GenBank # MK260610), Pendolo, Boe, 02°05.405'S 120°38.551'E to 02°05.446'S 120°38.519'E, 750-950 m, beaten, 15-V-2013.

Distribution.

S-Sulawesi Prov. (Tanah Toraja); C-Sulawesi Prov. (Pendolo). Elevation 910-1450 m.

Biology.

On foliage in montane forests.

Etymology.

This epithet is the diminutive form of the Latin adjective ovatus, -a, -um (egg-shaped) and refers to the species´ body form and small size. It is a variable adjective as well.

Notes.

Trigonopterus ovatulus Riedel, sp. n. was coded as " Trigonopterus sp. 535". This species is very closely related to T. pseudovatulus Riedel, sp. n., from which it cannot be separated by morphological characters. It differs by ca. 17.1-17.3% p-distance of cox1, correlated by marked differences in the nuclear genes 28S and CAD. Two allopatric populations occur at Gn. Karre and at the mountains north of Lake Poso. The latter population is sympatric with T. pseudovatulus Riedel, sp. n.. In the future, more comprehensive studies could lead to the conclusion that these populations also constitute distinct species.