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 9-102336435661

Oosternum latum Fikacek, 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.