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

Strongylium (s. str.) bidens sp. nov. ( Figs 1 View Fig , 7A–C)

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Type material designated. Holotype ♂ NME: INDONESIA, Sulawesi, South Sulawesi Prov., Makale 5 km SW, 3°08’S, 119°49’E, 01.I.2018, 1500 m, disturbed lowland rainforest, day collecting [printed] GoogleMaps . Paratypes 3 specimens. 1♂ NME & 1♀ DTC : same label as holotype; 1♂ DTC : INDONESIA, Sulawesi, South Sulawesi Prov., Makale 6 km SSW, 3°08’S, 119°49’E, 10.I.2018, 1700 m, disturbed lowland rainforest, day collecting [printed] GoogleMaps .

Derivatio nominis. Named from Latin ‘bidens’ (bident), an apically bifurcate fishing tool, to point on the acutely bidentate elytral apex of this species. Noun in apposition.

Measurements. Holotype male, total body length 10.7 mm; head length 1.4 mm, maximum head width across compound eyes 1.6 mm, pronotal length 1.7 mm, maximum pronotal width 2.5 mm, elytral length 7.6 mm, maximum combined width 3.4 mm. Female paratype 11.1 mm long.

Description. Holotype male. Dorsal and ventral forebody dark castaneous with weak khaki metallic reflection. Elytra with strong bronze-green, in part purple-reddish metallic reflection. Mouthparts and 3.5 basal antennomeres castaneous, terminal maxillary palpomere black-brown. Femora dark castaneous, distally with weak purple reflection. Tibiae dark castaneous in basal, blackish in distal portion. Tarsi blackish, pretarsal claws brown. Ventral pterothorax castaneous with khaki green metallic reflection, abdominal sternites khaki green metallic. Head trapezoid, slightly transverse, moderately glossy dorsally and ventrally. Labrum subtruncate at anterior margin. Epistoma truncate at anterior margin. Moderately deep, nearly straight to slightly concave impression at place of frontoclypeal suture. Antennal insertion concealed in dorsal view beneath raised gena. Compound eye large, strongly emarginate at anterior margin 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 0.85× as wide as length of dorsal eye portion. Tempus very short. Head dorsum densely punctate with irregularly circular, deep punctures, corrugate at upper eye margin. Intervening spaces glossy and glabrous, generally narrower than to as wide as punctures but distinctly wider than those on vertex. Head dorsal setation inconspicuous. Antenna moniliform, slightly widened distally, reaches metacoxa when directed posteriorly. Basal antennomere about twice as long as antennomere two. Antennomere two small, hardly longer than wide. Antennomere three 4.5× as long as antennomere two, slightly shorter than antennomere four. Antennomeres 5–10 slightly thickened, 8–10 elongate cylindrical, not or hardly widened distally. Terminal antennomere rounded apically, about as long as penultimate antennomere. Terminal maxillary palpomere small, strongly triangular. Pronotum transverse, moderately glossy dorsally, widest in basal third, slightly converging anteriad, truncate at both anterior and posterior margin. Anterior pronotal edge finely margined, margin expanded medially forming poorly defined, broadly triangular flange. Posterior pronotal edge broadly margined. Anterolateral angles broadly rounded, posterolateral angles nearly right-angled in dorsal view. Lateral pronotal edge delicately

11 margined, not visible in dorsal view. Pronotal punctures circular, deep and dense. Intervening spaces glossy and glabrous, generally narrower than, at some parts of pronotal disc twice as wide as punctures. Dorsal pronotal setae inconspicuous, seta raises from centres of some punctures, directed anteriad to obliquely laterally, not surpass length of corresponding puncture. Scutellar shield small, triangular, acutely angulate at posterior margin, glossy and glabrous, minutely punctate. Elytra widest across humeri, glossy and shiny, slightly and gradually converging towards apex, dorsally somewhat humped in postbasal fourth, gradually declivous towards apex, inconspicuous transverse impression beyond humped portion (best visible in lateral view). Elytron apical sutural angle nearly right-angled (in dorsal view), apical outer angle produced into acute spine ( Fig. 1 View Fig ). Elytral surface with deepened, punctured longitudinal striae (eight complete to nearly complete and one short scutellar stria visible in dorsal view) and elevated, rounded (in dorsal aspect) interstriae. Striae 4–5 shortest and conjoin preapically, striae 3–6 not reaching elytral apex, conjoin preapically. Punctures in striae significantly smaller on apical fourth and in striae 1–2, becoming large, deep, crateriform in outer striae. Intervening spaces glossy and glabrous, in part transversely wrinkled in part sparsely microscopically punctate, variably wide depending on size of punctures. Elytral lateral margin not visible in dorsal view. Elytron glabrous. Epipleuron complete, narrow, glabrous. Metathoracic wings fully developed (functional). Abdominal sternites minutely punctate with microscopic isodiametric intervening spaces, very shortly setose. Legs very long and slender, especially mesothoracic pair. Femur slender, slightly clavate, densely punctate. Tibia shorter than corresponding femur, nearly straight, hardly widens distally. Tarsus long, that of mesotibia slightly shorter than corresponding tibia. Terminal tarsomere of each leg longer

12 than combined length of remaining correspondding tarsomeres. Male tergite VII and sternite VII broadly rounded at posterior margin. Aedeagus as in fig. 7A–C.

Sexual dimorphism. Female antenna comparatively shorter, exceeds slightly beyond mesocoxa when directed posteriorly. Female tergite VII and sternite VII broadly rounded at posterior margin.

Differential diagnosis. No known congeners from Wallacea have bispinose elytral apex. The elytral punctures (much stronger in the outer elytral striae) in the combination with the dorsal sculpture of the forebody are additional distinguishing features of the new species. Strongylium (s. str.) cuspidatum Kaszab, 1977 from New Guinea has the elytral apex bidentate, but the elytra distinctly tuberculate and the pronotum with projecting anterolateral angles and a median angulation on the lateral margin.

Ecology. Diurnal species, sampled at 1500– 1700 m in a disturbed mid-montane rainforest.

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