Hoplasoma acuminatum 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 : 421-424

Hoplasoma acuminatum Medvedev, 2000

( Figs 1–4 , 7, 9–16, 18 )

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

Type locality. “ Thailand: Khao Sok” [Khao Sok National Park, Surat Thani prov., Thailand].

Type material. Holotype ♀ ( LMCM), labelled: “ Thailand, 8 55´N / Khao Sok 98 45´E / 1996 / M. Mostovski coll. [w, p] // HOLOTYPUS [p] / Hoplasoma / acuminata m. [h] / L. N. Medvedev det. 9 [p] 9 [r, h]”.

Additional material studied. 9 specimens — THAILAND: 1 ♀, Chiang Mai prov., Ban Sak Pakia, 1700 m, 25.iv.–7.v.1996, S. Bílý leg. ( JVCJ); 1 ♀, Chiang Mai prov., Doi Suthep-Pui , 1300-1500 m, 18.–23.iv.1991, P. Pacholátko leg. ( NHMB); 1 ♀, Chiang Mai prov., Doi Suthep to Doi Pui, 19.–23.iv.1991, J. Horák leg. ( JBCB); 2 ♂, Chiang Mai prov., Chiang Dao, 5.–10.vii.1997, M. Klícha leg. ( JBCB). LAOS: 3 ♂, Khammouan prov., 17°43´N 105°09 E, 500-600 m, 22.v.–8.vi.2001, E. Jendek & O. Šauša leg. ( JBCB). MYANMAR: 1 ♀, Karen Mts., Doherty leg. ( BMNH).

Description of male ( Fig. 1 ). Body lustrous including elytra, glabrous (with scarce short setae on apical third of elytra), completely yellowish orange, except apices of mandibles black.

Measurements. Males: 5.8-6.7 mm, females: 8.0- 8.7 mm (holotype 8.5 mm).

Labrum transverse, with four setae in transverse row, anterior margin slightly concave, lateral margins convergent. Anterior part of head short, impunctate, glabrous with several pale setae in anterolateral angles. Interocular space wide, 2.0 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 with group of very short setae behind each eye, with indistinctly impressed median line. Antennae filiform, 0.75 times as long as body, length ratio of antennomeres equals 22-10-19-22 -23-23-21-20- 18-17-18.

Pronotum 1.45 times as broad as long, widest at first quarter, disc with distinctly convex anterior half, posterior half impressed. Anterior margin slightly concave, unbordered. Lateral margins bordered, with anterior half slightly rounded, posterior half parallel. Posterior margin slightly rounded, thinly bordered. Anterior angles obtusangulate with slightly swelled tip, posterior angles rectangular with sharply protruding tip. All angles with setigerous pore bearing long pale seta. Several very short setae also on lateral margin behind anterior angles. Scutellum impunctate, triangular.

Elytra lustrous, 2.20 times as long as wide and 0.70 times as long as body, with three distinct costae starting on or near humerus and ending before apex and traces of the fourth costa in apical half of elytral length along suture. Apex moderately rounded ( Fig. 12 ). Epipleura narrow, disappearing before apex.

All first tarsomeres enlarged. Protarsomere 1 elongate, 2.75 times as long as wide, 1.15 times as wide as protarsomere 2. Length ratio of protarsomeres 1–4 equals 22-12-8-16 ( Fig. 16 ). Metatarsomere 1 parallel-sided, 3.70 times as long as wide, as wide as metatarsomere 2. Length ratio of metatarsomeres 1–4 equals 22-14-8-17 ( Fig. 18 ).

Ventral surface subopaque, finely punctate, covered with pale setae. Abdomen simple, last ventrite with subtriangular impression in middle of posterior half, posterior margin with two very small incisions ( Fig. 15 ).

Aedeagus symmetrical, wide, apex triangular with moderately rounded tip. In lateral view, apical quarter slightly bent up ( Fig. 7 ).

Female ( Fig. 2 , holotype Fig. 3 ). Body brownish, with black metaventrite, sometimes with brownish abdomen. Elytra dull, apex distinctly prolonged ( Fig. 13 ). All first tarsomeres not enlarged, elongate. Last ventrite with large semicircular incision, penultimate ventrite with posterior margin strongly beveled ( Fig. 14 ). Gonocoxae separated in anterior third, each apical process bearing four setae apically and additional two setae laterally, base semicircular ( Fig. 9 ). Spermatheca: cornu shortly C-shaped, without distinct nodulus, proximal spermathecal duct long, gradually narrowed ( Fig. 10 ). Sternite VIII oval, anterior margin slightly concave, setae cummulated along anterior margin except one seta laterally, tignum thin, slightly longer than sternite VIII ( Fig. 11 ).

Differential diagnosis. Hoplasoma acuminatum is very similar to H. sumatranum Medvedev, 2000 . Both species share elytra with three well developed costae and can be distinguished by the shape of first tarsomeres extended in H. acuminatum while thin in H. sumatranum ( Figs. 16–19 ). Aedeagus of H. sumatranum has a narrowed 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. Thailand ( Medvedev 2000a, present paper). New species for Laos and Myanmar.

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.