Scapomegas Lacordaire, 1854

Leivas, Fernando W. T., Bicho, Carla L., Degallier, Nicolas & Moura, Daniel P., 2012, Revision of the genus Scapomegas Lacordaire, 1854 (Coleoptera: Histeridae: Omalodini), Zootaxa 3482, pp. 33-46 : 42

Key of identification of the species of Scapomegas Lacordaire, 1854

1. Anterior margin of the pronotum straight behind the head ( Figs. 1 E; 5C); elytra with outer subhumeral stria complete ( Fig. 2 C); propygidium with strong punctuation on the whole surface ( Fig. 10 B); associated with the Atlantic Forest biome........................................................................................ S. aurifer Marseul, 1887

- Anterior margin of the pronotum sinuous behind the head ( Figs. 1 A, C; 5 A, B); elytra with outer subhumeral stria short ( Fig. 2 A, B); propygidium without strong punctuation on the whole surface ( Figs. 10 A; 3D)........................ 2

2. Lateral pronotal stria complete ( Fig. 5 A); 3rd visible abdominal sternite with a sulciform row of punctures ( Fig. 1 B); 8th sternite of the male terminalia, in ventral view on lateral-posterior region, at least with two longest bristles and others small ( Fig. 6 A); associated with the Amazon biome..................................................... S. auritus Marseul, 1855

- Lateral pronotal stria widely interrupted at the posterior half ( Fig. 5 B); 3rd visible abdominal sternite with strong punctuation but without a sulcus ( Fig. 1 D); 8th sternite of the male terminalia, in ventral view on lateral-posterior region, with only one bristle ( Fig. 6 B), rarely with two bristle; associated with the Atlantic Forest biome.................. S. gibbus Marseul, 1855

Figures

FIGURE 1. Dorsal and ventral habitus. A – B. Scapomegas auritus Marseul; C – D. Scapomegas gibbus Marseul; E – F. Scapomegas aurifer Marseul. Scale 1 mm.

FIGURE 2. Lateral habitus. A. Scapomegas auritus Marseul; B. Scapomegas gibbus Marseul; C. Scapomegas aurifer Marseul. Scale 1 mm.

FIGURE 5. Pronotum. A. Scapomegas auritus Marseul; B. Scapomegas gibbus Marseul; C. Scapomegas aurifer Marseul. Scale 1 mm.

FIGURE 6. Eighth sternite of the male terminalia with detail of the bristles on the sides of the posterior margin (A – C, scale 0.5 mm and 0.125 mm, respectively) and ninth sternite and tergite (D – F, scale 0.5 mm). A, D. Scapomegas auritus Marseul; B, E. Scapomegas gibbus Marseul; C, F. Scapomegas aurifer Marseul.

FIGURE 10. Propygidium and pygidium in posterior view. A. Scapomegas gibbus Marseul; B. Scapomegas aurifer Marseul. Scale 0.5 mm.