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

Strongylium (s. str.) callainum sp. nov.

( Figs 2 View Fig , 7D–F) urn:lsid:zoobank.org:act:0FAE756E-9166-4107-A97F-124892870AFE

Type material designated. Holotype ♂ NME: INDONESIA, Sulawesi, South Sulawesi Prov., Palopo 12 km NWW, Battang vill., 2°57’S, 120°05’E, 04.I.2018, 800‒900 m, disturbed lowland rainforest, day collecting [printed]. The antennomeres 9–11 of the right antenna are missing. GoogleMaps

Paratypes 1♂ DTC & 1♀ NME : same label as holotype.

Derivatio nominis. Named from Latin ‘callainum’ (turquoise, greenish blue) to point on the turquoise reflecting elytra of this new species. Neuter.

Measurements. Holotype male, total body length 10.7 mm; head length 1.5 mm, maximum head width across compound eyes 1.7 mm, pronotal length 1.7 mm, maximum pronotal width 2.8 mm, elytral length 7.5 mm, maximum combined width 3.7 mm. Male paratype 11.8 mm, female paratype 11.2 mm long.

Description. Holotype male. Dorsal and ventral forebody and scutellar shield pale rufous. Elytra with strong pale blue metallic reflection. Antennomeres 1–2 and 10 rufous, 3–4 yellowish rufous basally, blackish apically, 5–9 blackish, terminal antennomere yellowish rufous with darkened tip. Legs rufous with blackish knees and most of terminal tarsomere which is rufous only at base. Venter uniformly pale rufous. Head slightly trapezoid, transverse, moderately glossy dorsally and ventrally. Labrum subtruncate at anterior margin. Epistoma truncate at anterior margin. Deep, nearly straight impression at place of frontoclypeal suture. Frons slightly 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 0.6× as wide as length of dorsal eye portion. Tempus very short. Head dorsum irregularly punctate, deep and denser on frons and along posterior eye margin, less dense and deep on vertex and epistoma. Intervening spaces glossy and glabrous, variably wide, generally wider than punctures except on frons between compound eyes. Head dorsal setation inconspicuous. Antenna moniliform, not widened distally, reaches metacoxa when directed posteriorly. Basal antennomere nearly twice as long as antennomere two. Antennomere two small, longer than wide. Antennomere three 3.5× as long as antennomere two, 0.8× as long as antennomere four. Antennomeres 4–7 slightly widened distally. Penultimate antennomere elongated, slender. Terminal antennomere elongate fusiform, shorter than penultimate antennomere. Terminal maxillary palpomere small, strongly triangular. Pronotum strongly transverse, moderately glossy dorsally, widest across midlength, slightly converging anteriad, truncate at anterior, slightly sinuous at posterior margin. Anterior pronotal edge finely margined, margin expanded medially

13 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 margined, not visible in dorsal view. Pronotal punctures small and sparse on most of pronotal disc, significantly larger and more dense on lateral sides. Intervening spaces glossy and glabrous, generally much wider than punctures, as wide as to narrower than those on lateral sides. Pronotal dorsum glabrous. Scutellar shield small, triangular, acutely angulate at posterior margin, glossy and glabrous, impunctate. Elytra widest across postmedium, dorsally moderately convex, glossy and strongly shiny. Elytral surface with punctured longitudinal striae (seven complete to nearly complete and one short scutellar stria visible in dorsal view) and barely elevated interstriae. Striae 4–5 shortest and nearly conjoin preapically. Punctures in striae significantly larger and deeper in outer striae 5–7 on basal portion of elytron. Intervening spaces glossy and glabrous, sparsely microscopically punctate and with microscopic isodiametric sculpture, variably wide. Elytral lateral margin not visible in dorsal view. Elytra glabrous. Epipleuron complete, narrow except at humerus, moderately glossy, glabrous. Metathoracic wings fully developed (functional). Abdominal sternites sparsely, flat punctate. Legs very long and slender, especially mesothoracic pair. Femur slender, slightly clavate, densely punctate. Tibia subequally long to corresponding femur, slightly arched (frontal) to nearly straight (middle and posterior), hardly widens distally. Terminal tarsomere of front leg longer than combined length of remaining protarsomeres. Male tergite VII and sternite VII broadly rounded at posterior margin. Aedeagus as in fig. 7D–F.

Sexual dimorphism. Female antenna shorter, exceeds slightly beyond mesocoxae.

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Intraspecific variability. One male paratype with castaneous dorsal forebody and venter.

Differential diagnosis. There is no species related to this new one known in the Oriental or Papuan region except for S. (s. str.) rufocaeruleum sp. nov. (described herein). See the differential diagnosis of the latter below.

Ecology. Diurnal species, sampled at 800– 900 m in a disturbed lower montane rainforest. In diurnal species of Strongylium dorsal body colouration is usually bright and shiny or with special markings and the specimens usually dwell on leaves or various rainforest vegetation.

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