Lutrochus Erichson

Maier, Crystal A. & Short, Andrew E. Z., 2013, A revision of the Lutrochidae (Coleoptera) of Venezuela, with description of six new species, Zootaxa 3637 (3), pp. 285-307 : 306

Key to Lutrochus Erichson species of Venezuela

1. Mesotibia with apical excavation for reception of tarsus ( Figs. 25 , 31 )............................................ 2

- Mesotibia lacking apical excavation for reception of tarsus ( Fig. 44 )............................................. 7

2. Elytra explanate, epipleuron appearing broad in ventral aspect ( Figs. 9, 10 ); reddish-brown in color; prosternum strongly deflexed ventrally in anterior half ( Fig. 12 ); apical maxillary palpomere strongly triangular ( Fig. 11 )................................................................................................ Lutrochus acuminatus Grouvelle

- Elytra not explanate, epipleuron appearing narrow in ventral aspect ( Figs. 15, 16 , 21, 22 ); dark brown to black in color; prosternum very slightly or not deflexed ventrally in anterior half ( Fig. 15 ); apical maxillary palpomere weakly triangular to discshaped ( Figs. 33 , 37 )................................................................................... 3

3. Body size small, total length 2.5–4.5 mm ................................................................... 4

- Body size large, total length 4.6–5.5 mm ................................................................... 5

4. Apical maxillary palpomere rounded to disc-shaped ( Fig. 37 ); apical metatarsomere setose ( Fig. 38 ); length 2.5–3.2 mm ......................................................................................... L. maldonadoi n. sp.

- Apical maxillary palpomere triangular ( Fig. 30 ); apical metatarsomere entirely glabrous ( Fig. 32 ); length 3.0–4.0 mm............................................................................................... L.vestitus Sharp

5. Apical protarsomere entirely glabrous ( Fig. 23 )............................................... L. gustafsoni n. sp.

- Apical protarsomere at least partially pubescent( Figs. 18 , 58 )................................................... 6

6. Apical protarsomere with discrete pubescent patch in basal third, apical two-thirds glabrous ( Fig. 18 ); body without metallic sheen dorsally ( Fig. 14 ).................................................................. L. cauraensis n. sp.

- Apical protarsomere pubescent, although more sparse in apical half ( Fig. 58 ); body with bluish-violet metallic sheen dorsally ( Fig. 55 )............................................................................... L. violaceus n. sp.

7. Metasternum with medial circular glabrous patch ( Fig. 45 ); scutellum diamond-shaped ( Fig. 46 ); elytron with seven rows of shallow punctures ( Fig. 40 ); apical maxillary palpomere narrow ( Fig. 43 )......................... L. meridaensis n. sp.

- Metasternum without medial circular glabrous patch ( Fig. 49 ); scutellum triangular ( Fig. 52 ); elytral punctation dense, confused ( Fig. 51 ); apical maxillary palpomere wide (Fig. 53)........................................ L. minutus n. sp.

Figures

FIGURES 20 – 26. Lutrochus gustafsoni n. sp.: 20. Habitus, dorsal view; 21. Habitus, ventral view; 22. Habitus, lateral view; 23. Protarsus; 24. Mesotarsus; 25. Metatarsus; 26. Aedeagus, dorsal and lateral views (scale bar = 0.62 mm).

FIGURES 27 – 33. Lutrochus vestitus Sharp: 27. Habitus, dorsal view; 28. Habitus, ventral view; 29. Habitus, lateral view; 30. Head, ventral view, showing shape of apical maxillary palpomere; 31. Mesotibia, showing apical notch; 32. Metatarsus; 33. Aedeagus, dorsal and lateral views (scale bar = 0.62 mm).

FIGURES 40 – 47. Lutrochus meridaensis n. sp.: 40. Habitus, dorsal view; 41. Habitus, ventral view; 42. Habitus, lateral view; 43. Head, three-quarters view, showing shape of apical maxillary palpomere; 44. Mesotibia; 45. SEM of metasternum, showing medial bare patch; 46. SEM of scutellum; 47. Aedeagus, lateral view (scale bar = 0.62 mm).

FIGURES 8 – 13. Lutrochus acuminatus Grouvelle: 8. Habitus, dorsal view; 9. Habitus, ventral view; 10. Habitus, lateral view; 11. Head, three-quarters view, showing shape of apical maxillary palpomere; 12. Prosternum, ventral view; 13. Aedeagus, dorsal and lateral views (scale bar = 0.62 mm).

FIGURES 14 – 19. Lutrochus cauraensis n. sp.: 14. Habitus, dorsal view; 15. Habitus, ventral view; 16. Habitus, lateral view; 17. Aedeagus, dorsal and lateral views (scale bar = 0.62 mm); 18. Protarsus; 19. Metatarsus.

FIGURES 34 – 39. Lutrochus maldonadoi n. sp.: 34. Habitus, dorsal view; 35. Habitus, ventral view; 36. Habitus, lateral view; 37. Head, three-quarters view, showing shape of apical maxillary palpomere; 38. Metatarsus; 39. Aedeagus, dorsal and lateral views (scale bar = 0.62 mm).

FIGURES 55 – 60. Lutrochus violaceus n. sp.: 55. Habitus, dorsal view; 56. Habitus, ventral view; 57. Habitus, lateral view; 58. Protarsus; 59. Metatarsus; 60. Aedeagus, dorsal and lateral views (scale bar = 0.50 mm).

FIGURES 48 – 52. Lutrochus minutus n. sp.: 48. Habitus, dorsal view; 49. Habitus, ventral view; 50. Habitus, lateral view; 51. Scutellum; 52. Elytra, showing sculpturing 53. Head, three-quarters view, showing shape of apical maxillary palpomere; 54. Aedeagus, dorsal and lateral views (scale bar = 0.62 mm).