Hoplasoma sumatranum Medvedev, 2000

Bezděk, Jan, 2014, A revision of Hoplasoma acuminatum and H. thailandicum species groups, and re-definition of H. unicolor species group (Coleoptera: Chrysomelidae: Galerucinae), Zootaxa 3794 (3), pp. 419-434 : 424-425

Hoplasoma sumatranum Medvedev, 2000

( Figs 5–6 , 8, 17, 19 )

Hoplasoma sumatrana Medvedev, 2000a: 125 (key), 128 (original description).

Type locality. “North Sumatra”.

Type material. Holotype ♂ ( LMCM), labelled: “ N. Sumatra [w, h] // HOLOTYPUS [p] / Hoplasoma / sumatrana / m. [h] / L. N. Medvedev det. 9 [p] 9 [r, h]”.

No additional material studied.

Redescription of male ( Fig. 5 , holotype). Body lustrous including elytra, glabrous (with scarce short setae on apical slopes of elytra and on outer margin of outer elytral costa), completely yellowish orange, except apices of mandibles black.

Measurements. Male: 6.3 mm (holotype).

Labrum transverse, without setae (probably broken in holotype), anterior margin distinctly concave, lateral margins convergent. Anterior part of head short, impunctate, glabrous with several pale setae below antennal insertions. Interocular space wide, 1.45 times as wide as transverse diameter of eye. Interantennal space as wide as transverse diameter of antennal socket. Frontal tubercles subtriangular, slightly elevated, lustrous, glabrous, impunctate. Vertex impunctate, glabrous, without visible median line. Antennae filiform, length ratio of antennomeres equals 21-9-16-22 -21-21-20-19-19 (rest broken).

Pronotum 1.35 times as broad as long, widest at first quarter, disc with slightly convex anterior half, posterior half impressed. Anterior margin moderately concave, unbordered. Lateral margins bordered, with anterior half slightly rounded, posterior half straight and slightly convergent. Posterior margin moderately rounded, thinly bordered. Anterior angles rectangular, posterior angles obtusangulate. All angles with setigerous pore (setae broken in holotype). Scutellum impunctate, triangular, with rounded apex.

Elytra lustrous, 2.35 times as long as wide and 0.71 times as long as body, with three distinct costae starting near humerus and ending before apex and traces of the fourth costa in apical half of elytral length along suture. Apex moderately rounded. Epipleura very narrow, disappearing before apex.

All first tarsomeres slightly widened, distinctly prolonged, parallel. Protarsomere 1 4.2 times as long as wide, as wide as protarsomere 2. Length ratio of protarsomeres 1–4 equals 23-13-10-14 ( Fig. 17 ). Metatarsomere 1 4.8 times as long as wide, as wide as metatarsomere 2. Length ratio of metatarsomeres 1–4 equals 24-14-10-15 ( Fig. 19 ).

Ventral surface subopaque, finely punctate, covered with pale setae. Abdomen simple (last ventrite not examined).

Aedeagus symmetrical, apex gradually rounded to triangular tip, base narrow and convergent. In lateral view, apical quarter straight ( Fig. 8 ).

Female unknown.

Differential diagnosis. Hoplasoma sumatranum is closely related to H. acuminatum . Both species share the characters mentioned in definition of species group. The holotype of Hoplasoma sumatranum has long and thin first tarsomeres while the first tarsomeres in H. acuminatum are distinctly widened ( Figs 16–19 ). Aedeagus of H. sumatranum has narrowed and convergent basal quarter (wide in H. acuminatum ) and in lateral view the apical quarter is straight (slightly bent up in H. acuminatum ) ( Figs 7–8 ).

Distribution. Indonesia: Sumatra ( Medvedev 2000a).

Figures

FIGURES 1 – 6. Habitus of Hoplasoma. 1 — H. acuminatum (male, Laos, 6.4 mm); 2 — H. acuminatum (female, Thailand, 7.9 mm); 3 — H. acuminatum (female, holotype, 8.3 mm); 4 — H. acuminatum, labels of holotype; 5 — H. sumatranum (male, holotype, 6.3 mm); 6 — H. sumatranum, labels of holotype.

FIGURES 7 – 19. Details of Hoplasoma acuminatum and H. sumatranum. 7 – 8: aedeagus (dorsal view at left, lateral view at right); 9: gonocoxae; 10: spermatheca; 11: sternite VIII; 12: elytral apex in male; 13: elytral apex in female; 14: last two ventrites of female; 15: last ventrite of male; 16 – 17: male protarsus; 18 – 19: male metatarsus. 7, 9 – 16, 18 — H. acuminatum; 8, 17, 19 — H. sumatranum. Scale bars: 0.5 mm for Figs 7 – 11 and 16 – 19, 1 mm for Figs 14 – 15.