Subprotelater lambirensis Arimoto, 2025

Subprotelater lambirensis Arimoto , sp. nov.

( Figures 1–3 View FIGURE 1 View FIGURE 2 View FIGURE 3 )

Type material. Holotype. Male (AA2737), Malaysia, Sarawak, Miri, Lambir Hills National Park , 22 IX 2010, Keiko Kishimoto-Yamada and Takao Itioka leg., by FIT in the canopy.

Male. Diagnosis. This species is characterized by the following features: punctures small; interspaces between punctures generally larger than puncture diameter; body black; elytron with four sub-circular yellow spots; antennomeres I and II dark red; antennomeres III –IX black; legs dark red but coxae and femurs black tinged with red; setae yellow brown; pronotum 1.2 × longer than wide; prosternal process 1.8 × longer than procoxal cavity length in ventral view; mesal posterior angle of hypomeron strongly protruding; posterior part of scutellar shield not visible in lateral view; elytron 4.8 × longer than wide, 2.0 × longer than pronotal length; metepisternum narrower than width of elytral epipleuron; basal struts 0.15 × total length of median lobe; apices of parameres roundly truncate.

Measurements. BL: 4.52, BW: 1.25, MAE: 0.78, MBE: 0.53, OI: 146, PL: 1.48, PML: 1.31, PW: 1.23, PAW: 0.79, PLI: 120, PWI: 156, EL: 2.92, EW: 0.61, EI: 479, BI: 198.

Description. Body ( Fig. 1 View FIGURE 1 ) elongate; surface generally smooth, shining, but rough on depression of hypomeron for reception of pro-femur and tibia; punctures small; depressions of hypomeron for reception of proleg and of mesepimeron and metasternum for reception of midleg without punctures; interspaces between punctures generally larger than puncture diameter. Color. Body black. Elytron with four sub-circular yellow spots, of which one spot medially on humerus, two spots side-by-side on anterior 1/3, and one spot medially on posterior 1/3. Pronotal posterior lateral apices, posterior external edge of antennal groove of hypomeron, apical part of prosternal process, distal edge of elytron, posterior margins of metasternum and metacoxal plates and posterior part of abdomen tinged with red. Mouthparts yellowish with labrum and mandibles dark red; antennomeres I and II dark red; III–IX black; legs dark red but coxae and femurs black tinged with red. Body covered with yellow brown setae ( Fig. 1A, B View FIGURE 1 ).

Head. Frontal margin broadly rounded in dorsal view ( Fig. 2A View FIGURE 2 ); frons distinctly depressed mesally and longitudinally ( Fig. 2A, B View FIGURE 2 ); supra-antennal carina absent ( Fig. 2B, C View FIGURE 2 ); frontoclypeal region most protruding between antennal sockets ( Fig. 2D View FIGURE 2 ), grooved between eyes and mandibles ( Fig. 2C View FIGURE 2 ); the grooves receive basal two antennomeres, opened posteriorly. Eyes 0.15 × longer than interocular distance in dorsal view. Mouthparts directed ventrally ( Fig. 2D View FIGURE 2 ). Labrum semioval ( Fig. 2E View FIGURE 2 ), 0.5 × longer than wide. Antennae extended beyond half-length of pronotum and not reaching pronotal posterior lateral apices by antennomere XI ( Fig. 1A View FIGURE 1 ); relative antennomere lengths: II<III<IV–X<XI<I ( Fig. 2F View FIGURE 2 ); antennomere I elongate and curved cylindrical; II short cylindrical, 0.9 × longer than wide; III trapezoidal, 1.2 × longer than wide, 1.9 × longer than II; IV–X parallelogram, weakly rounded distally, 1.1–1.2 × longer than wide; IV 1.2 × longer than III, 0.8 × longer than II–III combined; V 0.95 × longer than IV; XI bullet shaped, 1.8 × longer than wide, 1.45 × longer than X; each antennomeres with a longitudinal carina distally; the carinae on VIII–X not reaching their anterior edge, and carina on XI short. Mandibles unidentate ( Fig. 2G View FIGURE 2 ); penicillus short, formed by brush of short setae; dorsal sinuous carina developed; with setae of various lengths on outside of the carina; outside concave basally ( Fig. 2C View FIGURE 2 ). Maxilla ( Fig. 2H View FIGURE 2 ): cardo constricted posteriorly; basistipe triangular; mediostipe bullet-shaped; galea short, brush-like; lacinia short, brush-like; palpomeres short and broad; palpomeres II–III shorter than wide; palpomere IV fusiform, 1.4 × longer than wide. Labium ( Fig. 2I View FIGURE 2 ): mentum wide trapezoidal, with long setae; prementum with cluster of short setae medially; apical palpomere cylindrical.

Prothorax widened posteriad but almost parallel-sided on posterior half, widest on posterior 1/5, and then weakly narrowed ahead of posterior angles ( Fig. 1A View FIGURE 1 ). Antennal grooves between pronotum and hypomeron deep and opened anteriorly, not reaching posterior lateral apices of prothorax, visible in lateral view ( Fig. 2D View FIGURE 2 ); sides of antennal grooves carinate. Pronotum sub-hexagonal, 1.2 × longer than wide, roundly convex, tallest posterior to the center ( Fig. 2D View FIGURE 2 ), with median longitudinal depression posteriorly; each lateral carina extending from posterior angles along antennal grooves ( Fig. 2D View FIGURE 2 : black arrow), not reaching anterior angles; anterior angles obtuse ( Fig. 2A View FIGURE 2 ); anterior edge straight in dorsal view ( Fig. 2A View FIGURE 2 ); posterior angles extending posteriad, moderately broad, unicarinate; posterior edge without sublateral incision near each hind angle, lobated and protruding medially. Hypomeron depressed for reception of pro-femur and tibia, carinate behind the depression; anterior angle sharply pointed ( Fig. 2J View FIGURE 2 : white arrow); posterior edge broadly rounded mesally and weakly emarginate near distal posterior angle; mesal posterior angle strongly and sharply protruding ( Fig. 2J View FIGURE 2 : black arrow). Pronotosternal sutures ( Fig. 1B View FIGURE 1 ) deeply grooved to receive pro-tarsi; tarsal groove opened posteriorly and connected to hypomeron depression for reception of pro-femur and tibia ( Fig. 2J View FIGURE 2 ), becoming shallower anteriad, not reaching anterior edges of hypomeron and prosternum. Prosternum: anterior edge carinate, roundly projecting medially, depressed posterior to prosternal lobe; prosternal lobe short, not reaching the level of anterior edge of prothorax ( Fig. 2D View FIGURE 2 ). Prosternal process 1.8 × longer than procoxal cavity length, depressed between procoxae, strongly curved dorsad behind procoxae ( Fig. 2D View FIGURE 2 ); dorsal margin broadly rounded but with shallow concave medially in lateral view ( Fig. 2D View FIGURE 2 ); ventral lobe almost parallel sided and gradually narrowed near apex in ventral view, with median longitudinal carina on posterior 1/3 ( Fig. 1C View FIGURE 1 ); the carina forming pointed subapical tooth ( Fig. 2D View FIGURE 2 : white arrow); ventral margin rounded inward anteriorly and straight posteriorly in lateral view ( Fig. 2D View FIGURE 2 ); ventral apex reaching dorsal apex; apex rounded in ventral and lateral views ( Figs. 1C View FIGURE 1 , 2D View FIGURE 2 ). Scutellar shield strongly inclined anterior-downwards ( Fig. 1A View FIGURE 1 ), tongue-shaped in anterodorsal view ( Fig. 2K View FIGURE 2 ), narrowed posteriad but almost parallel-sided around its half-length, 1.1 × longer than wide, convex ( Fig. 2L View FIGURE 2 ); anterior part protruding anteriad ( Figs. 1A View FIGURE 1 , 2L View FIGURE 2 ); posterior part not visible in lateral view ( Fig. 2D View FIGURE 2 ); anterior angles rounded; anterior edge straight; apex rounded. Mesosternum ( Fig. 3A View FIGURE 3 ): anterior edge straight but sinuate laterally, lobate on each side; mesosternal cavity floor without median band of setae; mesosternal cavity almost parallel-sided in ventral view; borders of mesosternal cavity in lateral view rounded anteriorly, straight medially and then curved ventrad obtusely ( Fig. 2D View FIGURE 2 ); mesosternal process between mesocoxae lower than mesocoxae, not visible in lateral view ( Fig. 2D View FIGURE 2 ); posterior edge 0.2 × wider than total width of mesosternum, almost straight ( Fig. 3A View FIGURE 3 ); mesosternum and metasternum connate medially ( Fig. 2J View FIGURE 2 ). Mesepisternum excavate anteriorly ( Fig. 2J View FIGURE 2 ). Mesepimeron depressed for reception of mid-femur ( Fig. 2J View FIGURE 2 ). Mesocoxal cavity closed to mesepisternum by mesosternum and mesepimeron ( Fig. 2J View FIGURE 2 ). Elytron 4.8 × longer than wide, 2.0 × longer than pronotal length, parallel-sided but narrowed from posterior 1/2, rounded apically, broadly convex but plane medially ( Fig. 1C View FIGURE 1 ), with striae. Elytral apices not meeting at midline ( Fig. 1A View FIGURE 1 ). Hind wings ( Fig. 3B View FIGURE 3 ) fully developed, without veins CuA 1 and CuA 3+4; RA 3+4 vestigial ( Fig. 3B View FIGURE 3 : white arrow); r4 translucent; mediomedial-cross vein between MP 1+2 and MP 3+4 translucent ( Fig. 3B View FIGURE 3 : black arrow); mediocubital cross-vein between MP 3+4 and CuA 2 absent ( Fig. 3B View FIGURE 3 : grey arrow); AA3 vestigial; radial cell 4.0 × longer than wide. Metepisternum narrower than width of elytral epipleuron ( Fig. 2J View FIGURE 2 ). Metasternum depressed for reception of mid-tibia and tarsi, carinate ahead of depression for reception of mid-tibia and ventrad of depression for reception of mid-tarsi ( Fig. 2J View FIGURE 2 : grey arrow), sulcate medially and ahead of metacoxal cavities ( Fig. 1B View FIGURE 1 ). Metacoxal plate narrowed medially; lateral edge distinctly longer than width of metepisternum; lateral anterior angle rounded; lateral posterior angle broadly pointed ( Fig. 3C View FIGURE 3 : arrow). Tibiae with a pair of simple spurs ( Fig. 3D View FIGURE 3 : arrow); relative tarsomere lengths: IV<III<II<I<V ( Fig. 3D View FIGURE 3 ); tarsi and claws simple.

Abdomen. Ventrite V semicircular, broadly rounded apically ( Fig. 1B View FIGURE 1 ), 0.55 × longer than wide. Tergites and sternites VIII‒X yellow. Tergite VIII ( Fig. 3E View FIGURE 3 ) as long as wide, almost parallel-sided basally but weakly sinuate, broadly rounded apically. Sternite VIII ( Fig. 3F View FIGURE 3 ) triangular, abruptly narrowed at its half-length, shorter than wide; apex rounded. Tergite IX ( Fig. 3G View FIGURE 3 ) trapezoidal; anterior edge widely emarginate; median translucent area reaching tergite X. Tergite X ( Fig. 3G View FIGURE 3 ) curved triangular, widely emarginate anteriorly, rounded apically, 1.2 × longer than wide, 0.45 × length of tergite IX. Sternite IX ( Fig. 3H View FIGURE 3 ) elongate oval, widest at its half-length, broadly rounded apically. Aedeagus ( Fig. 3I, J View FIGURE 3 ) yellow, elongate. Phallobase 0.3 × total length of aedeagus, 1.1 × longer than wide. Median lobe gradually tapering to apex, exceeding apices of parameres by its apex; basal struts 0.15 × total length of median lobe. Parameres separated ventrally; apical parts without lateral subapical barbs, roundly truncate apically, without setae (probably due to damage).

Female. Unknown.

Etymology. The specific epithet derives from Lambir Hills National Park, the type locality.

Distribution. Malaysia (Borneo).

Ecology. The life history and ecology of this species remain unknown, except that the holotype was collected via FIT in the canopy.