Stenommatus insularis Legalov, 2023

Legalov, Andrei A., 2023, A new species of the genus Stenommatus Wollaston, 1873 (Coleoptera, Curculionidae) from Indonesia, Baltic Journal of Coleopterology (Sao Paulo, Brazil) 23 (2), pp. 215-220 : 217-218

Stenommatus insularis Legalov , sp. nov.

( Fig. 1 )

Type material: Holotype. Male ( ISEA), Indonesia, N Moluccas, Bacan Isl. , SE slopes of Mt. Sibela, 5 km SE of Makian vill., 500-570 m, 2-12.V.2008, St. Jakl . Paratypes, 2 males ( ISEA) , 8 females ( ISEA), idem .

Description. Body black, with matted dense pubescence. Antennae, apex of tibiae and tarsi red-brown.

Male: Head subconical, coarsely punctate. Rostrum 0.8-0.9 times as long as pronotum, 2.5-2.7 times as long as wide at apex, 2.5- 2.6 times as long as wide at midlength and 2.7 times as long as wide at base, curved, weakly convex dorsally, densely punctate; apex subglabrous. Eyes large, linear, almost not protruding from contour of head, contiguous ventrally, coarsely faceted. Forehead weakly flattened, about 0.9 times as narrow as rostrum base width, densely punctate. Temples about 1.6 times as long as eye length. Antennal scrobes directed to base of rostrum. Antennae inserted before middle of rostrum. Scape long, 4.8 times as long as wide at apex, extends beyond back of eye. Funicle 4-segmented. Antennomeres 2-5 subconical. Antennomere 2 about 1.2 times as long as wide at apex, about 0.15 times as long as and 0.6 times as narrow as scape. Antennomere 3 1.6 times as long as wide at apex, about 1.1 times as long as and about 0.8 times as narrow as antennomere 2. Antennomere 4 about 0.7 times as long as wide at apex, about 0.6 times as long as and 1.4 times as wide as antennomere 3. Antennomere 5 about 0.6 times as long as wide at apex, subequal in length and about Pronotum campanulate, 1.3 times as long as wide at apex, equal in width at midlength and equal or slightly longer than wide at pronotal base, with distinct pronotal constriction. Pronotal disc weakly convex dorsally, coarsely punctate. Intervals between points larger than their diameter. Maximum width in middle. Scutellum small.

Elytra narrowed from humeri to apex, 1.6- 1.8 times as long as wide at base, 1.6 times as long as wide at midlength, 2.3-2.6 times as long as wide at apical fourth, 2.0-2.1 times as long as pronotum. Humeri flattened. Elytral striae distinct, about 1.0- 1.2 times as wide as interstria width. Interstriae convex, carinate, quite narrow.

Prosternum punctate, without postocular lobes. Precoxal portion of prosternum about 1.8 times as long as procoxal cavity length. Postcoxal portion of prosternum about 0.5 times as long as procoxal cavity. Procoxal cavities quite narrowly separated. Metepisternum concealed by elytra. Metaventrite flattened, coarsely punctate. Ventrites 1 and 2 weakly convex, coarsely punctate. Ventrite 1 slightly shorter than length of metacoxa. Ventrite 2 1.2 times as long as ventrite 1. Ventrites 3 and 4 subequal in length, short, flattened. Ventrite 3 about 0.3 times as long as ventrite 2. Ventrite 5 about 2.9 times as long as ventrite 4, coarsely punctate.

Procoxae spherical. Metacoxae almost transverse. Femora slightly thickened, without tooth. Tibiae weakly curved, with large uncus. Tarsi long. Tarsomeres 1-3 subconical. Tarsomere 4 square. Tarsomere 5 elongate. Tarsal claws free, divergent.

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Total body length (without rostrum) 3.9-4.1 mm. Length of rostrum 0.9 mm.

Female: Rostrum 0.8-0.9 times as long as pronotum, about 2.8 times as long as wide at apex, 2.8-3.0 times as long as wide at midlength and 2.6-3.0 times as long as wide at base. Pronotum 1.3-1.4 times as long as wide at apex, equal or slightly longer than width at midlength and 1.0-1.1 times as long as wide at pronotal base. Elytra 1.7-1.8 times as long as wide at base, 1.6-1.7 times as long as wide at midlength, 2.2-2.5 times as long as wide at apical fourth, 1.9-2.0 times as long as pronotum. Precoxal portion of prosternum about 1.5 times as long as procoxal cavity length. Postcoxal portion of prosternum about 0.6 times as long as procoxal cavity. Metaventrite 3.7 times as long as length of metacoxa. Ventrite 1 1.2 times as long as length of metacoxa. Ventrite 2 1.2 times as long as ventrite 1. Ventrites 3 and 4 subequal in length. Ventrite 3 about 0.3 times as long as ventrite 2. Ventrite 5 about 2.9 times as long as ventrite 4.

Total body length (without rostrum) 3.7-4.3 mm. Length of rostrum 0.8-0.9 mm

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Diagnosis. This new species is similar to Stenommatus telnovi Legalov, 2022 from New Guinea but differs in the larger body size, wider elytra, more roughly punctured pronotum, and thicker antennal scape.

Etymology. From Lat. “insular”.

Distribution. Indonesia: Maluku Islands.

Figures

Fig. 1.Stenommatus insularis sp. nov. male: a – habitus, holotype, dorsally, b – habitus, holotype, laterally, c – aedeagus, holotype, dorsally; d – aedeagus, holotype, laterally; e – abdomen, paratype. Scale bar = 1.0 mm for a, b; 0.5 mm for c-e.