Dilobitarsus pendleburyi Fleutiaux, 1934

Arimoto, Kôichi, Kaliang, Clement Het, Mizuno, Takafumi, Meleng, Paulus, Kishimoto-Yamada, Keiko & Itioka, Takao, 2025, A new species and an additional record of the genus Dilobitarsus Latreille (Coleoptera, Elateridae, Agrypninae) from Borneo, Zootaxa 5679 (2), pp. 204-216 : 211-215

publication ID	https://doi.org/10.11646/zootaxa.5679.2.2
publication LSID	lsid:zoobank.org:pub:E160AA88-BA7D-4741-9E86-656DE419D54D
DOI	https://doi.org/10.5281/zenodo.16985776
persistent identifier	https://treatment.plazi.org/id/03EC0B35-C514-9671-FF3B-38809157FD3E
treatment provided by	Plazi
scientific name	Dilobitarsus pendleburyi Fleutiaux, 1934
status

Treatment

( Figures 5–8 View FIGURE 5 View FIGURE 6 View FIGURE 7 View FIGURE 8 )

Dilobitarsus pendleburyi Fleutiaux, 1934: 178 (original description; type locality: Malaysia, Sabah, Bettotan, near Sandakan); Hayek, 1973: 99 (generic review; examination of holotype); Arimoto, 2016: 38 View Cited Treatment (redescription; recorded from the Malay Peninsula and Sumatra); Kasmiatun et al., 2020: 37 (recorded from Sumatra).

Non-type material. 1 male, Malaysia, Pahang, Fraser’s Hill, 9 V 2010, Kiyoshi Matsuda leg. [ DPF01 ; OMNH] ; 1 female, Malaysia, Sarawak, Miri, Lambir Hills National Park , 23 VIII 2003, Keiko Kishimoto-Yamada & Takao Itioka leg. [AA1223; KIFDS] ; 1 female, Indonesia, West Sumatra, near Payakumbuh, Harau Valley , 15 VIII 1992, A. Sarimudanas leg. [ DPF02 ; OMNH] .

Diagnosis. Dilobitarsus pendleburyi is distinguished from the congeners by the following combination of characters: pronotum with transverse black band formed by black scale-like setae ahead of posterior tubercles ( Fig. 5A, B View FIGURE 5 ); elytra with white U-shaped band formed by white scale-like setae along apical margin ( Fig. 5A, B View FIGURE 5 ); frontal carina V-shaped in ventral view ( Fig. 6B, C View FIGURE 6 ); nasal plate high laterally ( Fig. 6C View FIGURE 6 ); antennae extended beyond pronotal posterior apices by antennomere XI in male ( Fig. 5A View FIGURE 5 ); antennomere III 1.3–1.6 x longer than wide ( Fig. 6E, F View FIGURE 6 ); antennomeres IV–V 1.2–1.35 x longer than wide ( Fig. 6E, F View FIGURE 6 ); antennomere XI 2.4–2.7 x longer than wide ( Fig. 6E, F View FIGURE 6 ); pronotum with six tubercles ( Fig. 6H View FIGURE 6 : arrows); prosternal carina extending anterad of coxal cavities ( Fig. 6I View FIGURE 6 : arrow); anterior edge of mesosternum with small median notch ( Fig. 6L View FIGURE 6 ); elytron broadly convex but abruptly depressed after strongly elevated tubercle ( Fig. 7A View FIGURE 7 ); parameres with short lateral subapical barb ( Fig. 7K, L View FIGURE 7 ); apex of parameres beyond lateral subapical barb 0.2 x total length of paramere ( Fig. 7I, J View FIGURE 7 ), sub-trapezoidal and 1.5 x width at expansions in dorsal side ( Fig. 7K View FIGURE 7 ); apical mesal edge of parameres emarginate between proximal and distal apices ( Fig. 7K View FIGURE 7 ).

Measurements. Male. BL: 11.6, BW: 3.05, MAE: 1.54, MBE: 0.93, OI: 165, PL: 3.62, PML: 2.98, PW: 2.89, PAW: 1.84, PLI: 125, PWI: 157, EL: 7.74, EW: 1.55, EI: 498, BI: 213. Female (2 specimens). BL: 8.99–15.3, BW: 2.39–3.98, MAE: 1.27–2.06, MBE: 0.78–1.25, OI: 162–164, PL: 2.89–4.75, PML: 2.52–4.05, PW: 2.28–3.78, PAW: 1.38–2.29, PLI: 126–127, PWI: 166, EL: 5.68–9.83, EW: 1.21–1.96, EI: 468–502, BI: 197–207.

Additional description. Head. Eyes 0.3 x longer than interocular distance in dorsal view ( Fig. 6A View FIGURE 6 ). Nasal plate protruding beyond base of labrum ( Fig. 6D View FIGURE 6 ). Antennomere II 0.65–0.7 x longer than wide ( Fig. 6E, F View FIGURE 6 ); III 1.3–1.6 x longer than wide, 2.5–3.2 x longer than II; IV 1.2–1.3 x longer than wide, 0.9–0.95 x longer than III, 0.65–0.7 x longer than II–III combined; V 1.2–1.35 x longer than wide, 0.9–1.1 x longer than IV; XI 2.4–2.7 x longer than wide, 1.5–1.7 x longer than X. Apical maxillary palpomere 1.8–1.85 x longer than wide ( Fig. 6G View FIGURE 6 ).

Thorax. Pronotum with six tubercles, of which anterior two elevated slightly ( Fig. 6D View FIGURE 6 : white arrow, 6H: white arrows) and posterior four elevated strongly ( Fig. 6D View FIGURE 6 : black arrows, 6H: black arrows), tallest at median posterior tubercles ( Fig. 6D View FIGURE 6 ), without median longitudinal depression posteriorly; posterior edge without sublateral incision near each hind angle. Prosternal process 2.8–3.0 x longer than procoxal cavity length. Scutellar shield 1.2–1.3 x longer than wide, not visible in lateral view ( Fig. 6D View FIGURE 6 ); anterior part inclined anterior-downwards and posterior part parallel to elytral surface ( Fig. 6K View FIGURE 6 ). Mesosternum ( Fig. 6L View FIGURE 6 ): anterior edge with small median notch, not lobate and sinuate on each side; mesosternal cavity almost parallel-sided anteriorly in ventral view; posterior edge 0.25–0.3 x wider than total width of mesosternum, straight ( Fig. 6L View FIGURE 6 ). Elytron broadly convex but abruptly depressed after strongly elevated tubercle ( Fig. 7A View FIGURE 7 : arrow), with band on underside of tubercle ( Fig. 7B View FIGURE 7 : arrow). Hind wings ( Fig. 7C View FIGURE 7 ) fully developed, without veins CuA 1 and CuA 3+4; r4 translucent; mediomedial cross-vein between MP 1+2 and MP 3+4 present; mediocubital cross-vein between MP 3+4 and CuA 2 vestigial; radial cell more than 4 x wide. Tarsomere IV with developed ventral lobes ( Fig. 7D View FIGURE 7 : arrow).

Abdomen. Ventrite V curved triangular, rounded apically ( Fig. 5C View FIGURE 5 ), 0.7–0.8 x longer than wide. Male. Tergites and sternites VIII‒X yellow ( Fig. 7E‒H View FIGURE 7 ). Tergite IX ( Fig. 7G View FIGURE 7 ); posterior median notch 0.2 x total length of tergite IX. Tergite X ( Fig. 7G View FIGURE 7 ) almost as long as wide, 0.8 x length of tergite IX. Aedeagus yellow to brown ( Fig. 7I, J View FIGURE 7 ). Phallobase 0.23 x total length of aedeagus, 0.72 x longer than wide. Median lobe; basal struts 0.2 x total length of median lobe. Parameres; apex beyond short lateral subapical barb 0.2 x total length of paramere, sub-trapezoidal and 1.5 x width at expansions in dorsal side ( Fig. 7K View FIGURE 7 ); ventral side 1/2 x width of dorsal side around apex ( Fig. 7L View FIGURE 7 : arrow); proximal apex broadly rounded ( Fig. 7K View FIGURE 7 : white arrow); distal apex narrowly rounded (deformable by drying and other factors) ( Fig. 7K View FIGURE 7 : black arrow); apical mesal edge emarginate between proximal and distal apices.

Female. Tergite VIII, sternite VIII and ovipositor yellow to brown ( Fig. 8A–D View FIGURE 8 ); sclerotized plate inside bursa copulatrix orange ( Fig. 8E View FIGURE 8 ). Tergite VIII ( Fig. 8A View FIGURE 8 ) 1.3 x longer than wide. Sternite VIII length between base of spiculum ventrale and apex 0.7 x longer than wide ( Fig. 8B View FIGURE 8 ). Spiculum ventrale 3.4 x longer than length of sternite VIII between base of spiculum ventrale and apex ( Fig. 8C View FIGURE 8 ). Uterus with colleterial gland each on dorsal and ventral sides ( Fig. 8F View FIGURE 8 : arrows).

Remarks. Arimoto (2016) described the pronotum as having four tubercles, but this was incorrect; actually, the pronotum has six tubercles.

Distribution ( Fig. 1 View FIGURE 1 : circles). Malaysia (Borneo, the Malay Peninsula), Indonesia (Sumatra).

Ecology. This species was collected from both lowland and highland areas ~ 1,000 m in altitude, in May and August. The new specimen was collected using light traps.