Sumatraxena helleri Legalov, 2023

Legalov, Andrei A., 2023, Two new genera of the subtribe Metrioxenina (Coleoptera, Belidae) from Timor and Sumatra islands, Ecologica Montenegrina 62, pp. 42-49 : 44-47

Sumatraxena helleri Legalov , sp. nov. ( Fig. 3 )

https://zoobank.org/ urn:lsid:zoobank.org:act:5818C081-10AF-4947-85ED-D3E1D43036E8

Type material: Holotype, male ( SMTD), INDONESIA: “ Sumatra, Manna”, “ M. Knappert ”, “ Samml. K.F. Hartmann, Ankauf 1941.1”, “Staatl. Mus. für Tierkunde Dresden” . Paratype, female ( SMTD), idem .

Description. Body yellowish, with fine pubescence. Rostrum, head, sixth-eleventh or ninth-eleventh antennomeres, middle of pronotum brownish. Male: Rostrum almost straight, slightly longer than pronotum, about 4.3 times as long as wide at apex, about 5.6 times as long as wide in middle, about 3.5 times as long as wide at base, with two longitudinal carinae, without adpressed setae ventrally. Antennae inserted near rostrum basis ventrally, almost reaching base of pronotum. First-ninth antennomeres subconical. First antennomere about 3.3 times as long as wide at apex, reaching eye. Second antennomere 1.9 times as long as wide at apex, 0.5 times as long as and 0.9 times as narrow as first antennomere. Third antennomere about 2.3 times as long as wide at apex, 0.9 times as long as and about 0.8 times as narrow as second antennomere. Fourth antennomere 2.4 times as long as wide at apex, about 1.1 times as long as and subequal in width to third antennomere. Fifth antennomere 2.2 1.3 times as long as wide at apex, subequal in length and 1.1 times as wide as fourth antennomere. Sixth antennomere two times as long as wide at apex, slightly longer and about 1.1 times as wide as fifth antennomere. Seventh antennomere two times as long as wide at apex, 1.2 times as long as and 1.2 times as wide as sixth antennomere. Eighth antennomere 1.7 times as long as wide at apex, subequal in length and 1.2 times as wide as seventh antennomere. Ninth antennomere 1.8 times as long as wide at apex, about 1.2 times as long as and 1.1 times as wide as eighth antennomere. Antennal club apically tomentose, 1.6 times as long as ninth antennomere. Tenth antennomere about 1.5 times as long as wide at apex, about 1.1 times as long as and about 1.4 times as wide as ninth antennomere. Eleventh antennomere about 0.6 times as long as wide at base. Forehead weakly convex, slightly narrower than rostrum base width, with median longitudinal furrow, densely punctate. Eyes large, convex, finely faceted. Head behind eyes with weak constriction. Temples slightly shorter than eye. Pronotum campaniform, about 1.5 times as long as wide at apex, 0.9 times as long as wide in middle, almost equal to width at base, weakly convex, with fife longitudinal carinae, with weak teeth on sides, densely punctate. Distance between points longer than their diameter. Scutellum almost pentagonal, about 1.6 times as long as wide. Elytra suboval, about 1.8 times as long as humeri, 1.5 times as long as wide in middle, 2.0 times as wide at apical fourth, about 2.4 times as long as pronotum, with slightly smoothed humeri. Elytral disc with indistinct carinae and weak striae, densely punctate. Apex of elytra without tooth. Precoxal portion of prosternum long, about 1.4 times as long as procoxal cavity. Postcoxal portion of prosternum short, about 0.6 times as long as precoxal portion. Procoxal cavities separated. Metaventrite weakly convex, punctate, two times as long as metacoxal cavity. Metepisternum narrow. Abdomen convex, densely punctate. Ventrites free. First ventrite about 1.6 times as long as metacoxal cavity. Second ventrite 0.6 times as long as first ventrite. Third ventrite about 0.8 times as long as second ventrite. Fourth ventrite subequal in length to third ventrite. Fifth ventrite about 1.1 times as long as fourth ventrite. Legs quite long. Procoxae large, spherical. Femora weakly thickened and flattened, lacking teeth, densely punctate. Profemora strongly widened. Metafemora weakly curved. Pro- and mesotibiae short and wide. Metatibiae curved. Tarsi wide. First tarsomere wide-conical. Second and third tarsomeres bilobed, with erect setae ventrally. Fifth tarsomere elongate. Tarsal claws free, divergent. Total body length (without rostrum) 3.3 mm. Length of rostrum 0.9 mm.

Female: Rostrum almost straight, 1.9 times as long as pronotum, 10.1 times as long as wide at apex, about 17.8 times as long as wide in middle, about 7.1 times as long as wide at base, without carinae and adpressed setae ventrally. Antennae inserted reaching base of elytra. First-ninth antennomeres subconical. First antennomere 4.0 times as long as wide at apex, reaching eye. Second antennomere 1.9 times as long as wide at apex, 2.4 times as long as and 0.8 times as narrow as first antennomere. Third antennomere about 2.3 times as long as wide at apex, about 0.8 times as long as and about 0.9 times as narrow as second antennomere. Fourth-eighth antennomeres subequal in length. Fourth antennomere 2.7 times as long as wide at apex, 1.2 times as long as and subequal in width to third antennomere. Fifth antennomere 2.4 times as long as wide at apex, 1.1 times as wide as fourth antennomere. Sixth antennomere two times as long as wide at apex, 1.2 times as wide as fifth antennomere. Seventh antennomere 1.7 times as long as wide at apex, 1.2 times as wide as sixth antennomere. Eighth antennomere 1.5 times as long as wide at apex, about 1.1 times as wide as seventh antennomere. Ninth antennomere about 1.6 times as long as wide at apex, about 1.1 times as long as and subequal in width to eighth antennomere. Antennal club apically tomentose, 2.1 times as long as ninth antennomere. Tenth antennomere about 1.7 times as long as wide at apex, about 1.5 times as long as and 1.5 times as wide as ninth antennomere. Eleventh antennomere about 0.6 times as long as wide at base. Temples subequal in length to eye. Pronotum 1.4 times as long as wide at apex, 0.8 times as long as wide in middle, almost equal to width at base. Elytra 1.8 times as long as humeri, 1.6 times as long as wide in middle, 1.9 times as wide at apical fourth, about 2.5 times as long as pronotum. Metatibiae and metafemora straight. Total body length (without rostrum) 3.4 mm. Length of rostrum 1.5 mm.

Etymology. Patronymic. In honour of late Karl M. Heller ( Germany), who studied the tribe Metrioxenini ( Heller 1915, 1925).

Localisation. INDONESIA: Sumatra Isl.

Figures

Figure 3. Sumatraxena helleri sp. nov., Sumatra: a – male, holotype, habitus, dorsal view; b – male, holotype, habitus, ventral view; c – female, paratype, habitus, dorsal view; d – male, holotype, tegmen, dorsal view; e – male, holotype, lateral view; f – female, paratype, habitus, lateral view; g – male, holotype, aedeagus, dorsal view; h – male, holotype, aedeagus, lateral view; i – male, holotype, eighth tergite, dorsal view. Scale bar = 1.0 mm for a-c, e-f, 0.5 mm for d, g-i.