Strongylium (s. str.) gawu, Telnov & Masumoto, 2024

Strongylium (s. str.) gawu sp. nov. ( Figs 3 View Fig , 8A–C View Fig )

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Type material designated. Holotype ♂ NME: INDONESIA, Sulawesi, South Sulawesi Prov., Palopo 9 km NW, Battang vill., 2°57’S, 120°07’E, 10.XII. 2017, 420 m, disturbed lowland rainforest, day collecting [printed]. The right terminal antennomere is missing. GoogleMaps

Derivatio nominis. Named from Buginese ‘gawu’ (blue) to point on the blue dorsum of this species. Bugis or Buginese is main language in South Sulawesi Province, especially in lowland areas. Noun in apposition.

Measurements. Holotype male, total body length 6.2 mm; head length 0.8 mm, maximum head width across compound eyes 1.2 mm, pronotal length 1.2 mm, maximum pronotal width 1.7 mm, elytral length 4.2 mm, maximum combined width 2.4 mm.

Description. Holotype male. Dorsum uniformly deep blue metallic, forebody with black background. Mouthparts, antenna, scutellar shield and legs black. Venter black, abdominal terminalia brownish. Head elliptical, transverse, slightly glossy dorsally and ventrally. Labrum subtruncate at anterior margin. Epistoma truncate at anterior margin. Deep, concave impression at place of frontoclypeal suture. Frons declivous in front of compound eyes. Antennal insertion concealed in dorsal view beneath raised gena. Compound eye large, anterior margin strongly emarginate at antennal insertion and genal canthus, broadly rounded at posterior margin, strongly protruding from lateral, moderately from dorsal outline of head. Minimum interocular distance about 0.5× as wide as length of dorsal eye portion. Tempus very short. Inner and posterior eye margin furcate along. Short raised sulcus at inner edge of each compound eye at narrowest portion of frons; frons shortly cut-like impressed mediad to each sulcus, medially flattened and inconspicuously sulcate ( Fig. 3B View Fig ). Head dorsum irregularly, shallowly punctate, punctures smaller and denser on epistoma; frons medially impunctate. Intervening spaces moderately glossy and glabrous, with microscopic isodiametric microsculpture, variably wide. Head widely glabrous except on anterior portion. Antenna moniliform, hardly widened in distal half, exceeds beyond mesocoxa when directed posteriorly. Basal antennomere about 2.5× as long as antennomere two. Antennomere two small, slightly longer than wide. Antennomere three about 2.8× as long as antennomere two, slightly longer than antennomere four. Antennomeres 6–10 slightly widened, with large flat punctures. Penultimate antennamere elongated, longer than wide. Terminal antennomere irregularly fusiform, apically rounded, about 1.1× as long as penultimate antennomere. Terminal maxillary palpomere small, strongly triangular. Cranial ‘neck’ longitudinally strigose. Pronotum strongly transverse, moderately glossy dorsally and laterally, subparallel at lateral margins, truncate at anterior and posterior margin. Anterior pronotal edge finely margined, margin thickened medially. Posterior pronotal edge broadly margined. Anterolateral angles broadly rounded, posterolateral angles nearly right-angled in dorsal view. Lateral pronotal edge delicately margined, not visible in dorsal view. Pronotal punctures larger than those on head, neatly circular, moderately deep. Intervening spaces moderately glossy and glabrous, with microscopic isodiametric sculpture, narrower than (mainly) to 3× as wide (rarely) as punctures. Pronotal dorsum glabrous. Scutellar shield small, narrowly triangular, acutely angulate at posterior margin, glossy and glabrous, sparsely punctate. Elytra widest across midlength, dorsally slightly convex, glossy and shiny. Elytral surface with punctured longitudinal striae (seven complete to nearly complete and one short scutellar stria visible in

15 dorsal view) and flat interstriae. Striae 4–5 conjoin preapically. Punctures in striae moderately deep, rather small. Interstriae slightly convex, with microscopic isodiametric sculpture. Elytral lateral margin not visible in dorsal view. Elytra glabrous. Epipleuron complete, moderately wide and glossy. Metathoracic wings fully developed (functional). Abdominal sternites sparsely, flat punctate. Legs very long and slender, especially mesothoracic pair. Femur slender, clavate, moderately dense punctate. Tibia subequally long to corresponding femur, slightly widened distally. Mesotarsus as long as, metatarsus nearly as long as corresponding tibia. Male tergite VII and sternite VII broadly rounded at posterior margin. Aedeagus as in fig. 8A–C.

Sexual dimorphism. Female is unknow.

Differential diagnosis. No similar species are known. An undescribed species from Borneo is slightly similar in having a small body with the dark greenish dorsum. The new species is easily distinguished from the Bornean in the subrectangular, only slightly convex pronotum (the pronotum constricted anteriorly, rather strongly convex in dorsal aspect and longitudinally impressed along the midline in the Bornean species), the elytra simply convex, with the moderately spaced punctures in striae (the elytra convex but weakly undulate in basal third with the closely punctate striae in the Bornean species).

Ecology. Diurnal. Sampled at 420 m in a degraded lowland rainforest.

Distribution. Sulawesi (central part): South Sulawesi Province.