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

Strongylium (s. str.) rufocaeruleum sp.

nov. ( Figs 5 View Fig , 8D–F View Fig ) urn:lsid:zoobank.org:act:40507975-1ED1-4B01-AD6D-43347EF95978

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, the right mesofemur is damaged by Anthrenus sp. GoogleMaps

18

Paratypes 2 specimens. 1♀ NME : same label as holotype; 1♀ DTC : INDONESIA, Sulawesi, South Sulawesi Prov., Palopo 12 km NWW, Battang vill., 2°57’S, 120°05’E, 11.XII. 2017, 770 m, disturbed lowland rainforest, MV light [printed] GoogleMaps .

Derivatio nominis. Named from Latin ‘rufum’ (rufous) + ‘caeruleum’ (blue, caeruleus) to point on the castaneous forebody in the combination with the dark blue elytra of this new species. Neuter.

Measurements. Holotype male, total body length 9 mm; head length 1.2 mm, maximum head width across compound eyes 1.7 mm, pronotal length 1.7 mm, maximum pronotal width 2.3 mm, elytral length 6.1 mm, maximum combined width 3.2 mm. Female paratypes 9.4–11.3 mm long.

Description. Holotype male. Dorsal and ventral forebody pale castaneous. Scutellar shield castaneous medially, lateral margins black. Elytra dark blue, apex yellow. Antennomeres 1–2 brown, 3–10 black, terminal antennomere rufous. Legs rufous with blackish knees and most of terminal tarsomere which is rufous at base and tip. Venter uniformly pale castaneous. Head slightly trapezoid, strongly transverse, moderately 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, strongly emarginate in anterior margin at antennal insertion and genal canthus, broadly and shallowly emarginate to subtruncate at posterior margin, strongly protruding from lateral, moderately from dorsal outline of head. Minimum interocular distance about 1.4× as wide as length of dorsal eye portion. Tempus very short. Head dorsum irregularly, delicately and shallowly punctate, somewhat denser on epistoma, less dense on median portion of frons. Intervening spaces glossy and glabrous, variably wide, generally wider than punctures with some exceptions. Head dorsal setation inconspicuous. Antenna moniliform, widened in distal half, nearly reaches metacoxa when directed posteriorly. Basal antennomere about 1.5× as long as antennomere two. Antennomere two small, longer than wide. Antennomere three twice as long as antennomere two, 0.9× as long as antennomere four. Antennomeres 5–10 widened distally and flattened dorsoventrally. Penultimate antennomere elongated, longer than wide. Terminal antennomere fusiform, apically rounded, about as long as penultimate antennomere. Terminal maxillary palpomere small, strongly triangular. Pronotum strongly transverse, glossy dorsally, widest in anterior portion, slightly converging in posterior, convex in dorsal aspect on anterior portion, truncate at anterior, slightly sinuous at 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 subacute in dorsal view. Shallow median longitudinal sulcus present on anterior portion of pronotal disc. Lateral pronotal edge delicately margined, visible in dorsal view in basal portion of pronotum. Pronotal punctures small and sparse on anterior and median, larger on basal and lateral portions of pronotal disc. Intervening spaces glossy and glabrous, generally much wider than punctures, smaller than those on base and at posterolateral angles. Pronotal dorsum glabrous. Scutellar shield small, narrowly 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 (eight complete to nearly complete and one short scutellar stria visible in dorsal view) and flat interstriae. Striae 4– 5 conjoin preapically. Punctures in striae significantly larger and deeper on basal and lateral portion of elytron, smaller on rest of elytral disc. Intervening spaces glossy and glabrous, sparsely microscopically punctate, variably wide. Elytral lateral margin visible in dorsal view except at humeral portion. Elytra glabrous. Epipleuron complete, moderately wide and glossy, glabrous. Metathoracic wings fully developed (functional). Abdominal sternites sparsely, shallowly punctate. Legs very long and slender, especially mesothoracic pair. Femur slender, not clavate, densely punctate. Tibia

19 subequally long to corresponding femur, slightly curved and distally thickened (frontal) to nearly straight (middle and posterior), mesotibia somewhat thickened. Meso- and metatarsus as long as corresponding tibia. 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. 8D–F.

Sexual dimorphism. Female antenna shorter, exceeds slightly beyond mesocoxa, metatarsus shorter than corresponding tibia.

Differential diagnosis. The new species appears similar to S. (s. str.) callainum sp. nov. (Sulawesi, described above), but the antenna differently coloured, the pronotum convex in dorsal aspect and longitudinally sulcate on the anterior portion (not sulcate, dorsally flattened pronotum in S. (s. str.) callainum sp. nov.), the interocular distance 0.6× as wide as length of dorsal eye portion (about 1.4× as wide in S. (s. str.) callainum sp. nov.), the meso- and metathoracic tarsus about as long as the corresponding tibia in S. rufocaeruleum sp. nov. (shorter than the corresponding tibia in S. (s. str.) callainum sp. nov.), and the comparatively slender apex of the aedeagus.

Ecology. Sampled at 770–900 m in a disturbed lower montane rainforest and was also attracted to light.

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

20