Oosternum latum Fikacek , Hebauer & Hansen, 2009

Deler-Hernandez, Albert, Cala-Riquelme, Franklyn & Fikacek, Martin, 2014, A review of the genus Oosternum Sharp of the West Indies (Coleoptera: Hydrophilidae: Sphaeridiinae), Deutsche Entomologische Zeitschrift 61 (1), pp. 43-63 : 43

Oosternum latum Fikacek, Hebauer & Hansen, 2009 Figs 9-10 23 36 43 56 61

Oosternum latum Fikáček, Hebauer & Hansen, 2009: 34.

New material examined

(21 spec.). SAINT VINCENT AND GRENADINAS: Hermitage Forest, E. of Spring Village, ca. 360 m a.s.l., 13°14 ’53.04” N, 61°12 ’47.49” W, 16-27.viii.2006, S & J. Peck leg., forest FIT (06-105) (10 spec., SBPC, NMPC), 15-27.viii.2006, S & J. Peck leg., clearing FIT trap, (06-101B) (1 spec., SBPC), 16-27.viii.2006, S & J. Peck leg., forest edge Malaise, (06-104) (10 spec., SBPC, NMPC).

Diagnosis.

Body widest on base of elytra. Lateral margin of pronotum angulate. Pronotal punctation uniform in size, sparse, consisting of small, rasp-like, weakly impressed punctures. Pronotal interstices with microsculpture. Mesal part of prosternum divided from lateral portions by oblique sharp ridges. Lateral margin of antennal grooves with acute projection. Elytral interval 2 narrower than interval 3, lower than intervals 1 and 3, reaching elytral apex. Intervals 5, 7 and 9 distinctly higher than adjacent intervals. Elytral interstices opaque, with very fine microsculpture. Preepisternal plate wide, suboval, 2 × longer than wide. Interstices of median part of metaventrite without microsculpture, with subpentagonal slightly elevate median portion. Anterolateral ridges of metaventrite not meeting together mesally. Parameres 1.2 × longer than phallobase, bearing two short setae apically. Median lobe longer than parameres, projecting slightly farther than parameres, nearly parallel-sided basally, narrowing apicad in apical 0.2. Membranous lateral projections of median lobe present.

Description.

For complete description see Fikáček et al. (2009).

Distribution.

Oosternum latum is the endemic of the Saint Vincent Island ( Fig. 61 ). The specimens examined for this study represent the first precisely localized material available for the species, as only the island name is mentioned in the locality label of the type specimens ( Fikáček et al. 2009).

Habitat.

Specimens of Oosternum latum examined here were collected in a lower montane rain forest with mixed forest plant compositions. A portion of the specimens were collected using flight intercept traps, and others using a Malaise trap.

Figures

Figure 61. Distribution of the representatives of the Oosternum from West Indies. Shape of the symbols indicate the species group which the respective species belongs to (see the Discussion for details).

Figures 1 - 12. Habitus of Oosternum from West Indies. 1 - 2. Oosternum andersoni sp. n., lenght = 1.25 mm (1. dorsal view, 2. lateral view). 3 - 4. Oosternum bacharenge sp. n., lenght = 1.40 mm (3. dorsal view, 4. lateral view). 5 - 6. Oosternum cercyonoides sp. n., lenght = 1.95 mm (5. dorsal view, 6. lateral view). 7 - 8. Oosternum insulare sp. n., lenght = 1.40 mm (7. dorsal view, 8. lateral view). 9 - 10. Oosternum latum Fikacek, Hebauer & Hansen, 2009, lenght = 1.50 mm (9. dorsal view, 10. lateral view). 11 - 12. Oosternum luciae sp. n., lenght = 1.41 mm (11. dorsal view, 22. lateral view).

Figures 19 - 28. Pronotal punctation and microsculpture. 19. Oosternum andersoni 20. Oosternum bacharenge 21. Oosternum cercyonoides 22. Oosternum insulare 23. Oosternum latum 24. Oosternum luciae 25. Oosternum megnai 26. Oosternum pecki 27. Oosternum sharpi 28. Oosternum sp. (Bahamas).

Figures 29 - 38. Median portion of prosternum. 29. Oosternum andersoni 30. Oosternum bacharenge 31. Oosternum cercyonoides 32. Oosternum megnai 33. Oosternum pecki 34. Oosternum sp. (Bahamas) 35. Oosternum insulare 36. Oosternum latum 37. Oosternum luciae 38. Oosternum sharpi.

Figures 39 - 44. Meso- and metaventrite plate. 39. Oosternum andersoni 40. Oosternum bacharenge 41. Oosternum cercyonoides 42. Oosternum insulare 43. Oosternum latum 44. Oosternum luciae.

Figures 53 - 60. Aedeagus. 53. Oosternum andersoni 54. Oosternum bacharenge 55. Oosternum insulare 56. Oosternum latum 57. Oosternum luciae 58. Oosternum megna i 59. Oosternum pecki 60. Oosternum sharpi.