Oosternum andersoni
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Ordo: Coleoptera
Familia: Hydrophilidae
Genus: Oosternum
Name
Oosternum andersoni Deler-Hernández & Cala-Riquelme & Fikáček, 2014 sp. n. – Wikispecies link – ZooBank link – Pensoft Profile
Type-locality
Cuba, Santiago de Cuba Province: Santiago Municipality, 20.011°N, 75.673°W, 550 m, Km 7 of the road to Gran Piedra.
Type-specimens
(144 spec.). Holotype male, dry mounted, with genitalia mounted in Euparal on a microslide pinned below the specimen. Original label: “CUBA: Santiago de Cuba: Km 7 of the road to Gran Piedra, 26.i.2012, R. Anderson leg., 20.011°N, 75.673°W, elevation 550 m [printed] / Holotype, Oosternum andersoni sp. n., Deler-Hernández & Fikáček det. 2013 [red, printed]” (NMPC). Paratypes: CUBA: Pinar del Río province, Sierra del Rosario, Rangel, ca. 15 Km S. Cinco Pesos, 30.v.1990, M. A. Ivie leg., berlese from deep log and leaf litter (2 spec., WIFP). Cienfuegos province: Cumanayagua municipality, 2 Km E of Mayarí, ca. 842 m a.s.l., 21.96651°N, 80.11497°W, 18.v.2013, R. Anderson leg (2013-017) (29 spec., NMPC); Cumanayagua municipality, uphill road to Pico San Juan, ca. 1086 m a.s.l., 21.9881°N, 80.1464°W, 19.v.2013, R. Anderson leg (2013-022) (37 spec., NMPC); Cumanayagua municipality, Aguacate, Gruta Mengoa, near of Río Cabagan, ca. 620 m a.s.l., 21°55’52.43”N, 80°5’4.60”W, 20.v.2013, R. Anderson & A. Deler-Hernández leg (CF6) (53 spec., NMPC, CMN, BMNH, SEMC, SBPC). Holguín province: Mayarí municipality, Pinarito, PN La Mensura-Piloto, ca. 410 m a.s.l., 20.41598°N, 75.82008°W, 12.v.2013, R. Anderson leg (13 spec., NMPC). Santiago de Cuba province: Km 7 of the road to Gran Piedra, ca. 550 m a.s.l., 20.011°N, 75.673°W, 26.i.2012, R. Anderson leg. (2012-007) (5 spec., BSC-E, NMPC); 23.v.2013, R. Anderson leg. (2013-031) (4 spec., NMPC).
Differential diagnosis
Body widest ca at midlength. Lateral margin of pronotum weakly sinuate. Pronotal punctation uniform in size, moderately dense, consisting of small, rasp-like punctures. Pronotal interstices without microsculpture. Mesal part of prosternum not divided from lateral portions. Lateral margin of antennal grooves rounded. Elytral interval 2 narrower than interval 3, lower than intervals 1 and 3, reaching elytral apex. Elytral intervals 5, 7 and 9 distinctly higher than adjacent intervals. Elytral interstices shiny, without microsculpture. Preepisternal plate wide, drop-like, 2× longer than wide. Interstices of median part of metaventrite without microsculpture. Anterolateral ridges of metaventrite not meeting together mesally. Parameres 1.2× longer than phallobase, bearing two short setae apically. Median lobe shorter than parameres, widely oval in shape, acute at apex. Membranous lateral projections of median lobe absent.
Description
Habitus. Body elongate oval, gradually narrowing posteriad; total leght/total width ratio = 1.7. Length: 1.25–1.29 mm, length of holotype: 1.37 mm; width: 0.73–0.77 mm, width of holotype: 0.75 mm.
Coloration. Coloration of dorsal side brown to dark brown, elytra darker than pronotum, head dark brown. Ventral side brown. Femora and tibiae brown, tarsi, antennomeres 1–6 and mouthparts yellowish, antennal club pale reddish brown.
Head. Clypeus with sparse punctation consisting of fine rounded punctures, each puncture bearing fine decumbent seta; setae pale; interstices without microsculpture; anterior margin of clypeus slightly concave. Frons with dense punctation consisting of coarse rounded punctures, punctures of same shape medially and laterally; interstices with fine mesh-like microsculpture. Eyes moderately large. Mentum 1.8× wider than long, anterior margin slightly emarginate; anteromedian part not distinctly impressed; with sparse punctation, punctation consisting of minute, nearly indistinct punctures bearing minute setae; interstices with very fine microsculpture, opaque. Submentum without poriferous disc-like fields. Maxillary palpus with palpomeres 2 and 4 ca. 1.5× longer than palpomere 3. Antenna with 9 antennomeres; scapus shorter than antennomeres 2–6 combined.
Prothorax. Pronotum evenly convex forming continuous curve with elytra in lateral view. Lateral margin weakly sinuate; with narrow marginal bead. Pronotal punctation uniform in size, moderately dense; slightly sparser than that on frons, consisting of small, rasp-like punctures, slightly sparser laterally than medially; all punctures bearing long setae; interstices without microsculpture. Transverse row of punctures on posterior margin of pronotum absent. Median portion of prosternum not elevated and demarcated from lateral portions, median carina of prosternum narrow, projecting more anteriad mesally than anterior margin of median portion, with anterior portion elevated into small tooth in lateral view. Postero-mesal projection with deep notch. Antennal groves moderately large. Lateral margin of antennal grooves rounded.
Mesothorax. Scutellar shield bearing a few small punctures; interstices without microsculpture. Elytral series 1–5 arising basally, series 6–9 joint subbasally. Serial punctures small, transverse, sparsely arranged, with minute setae (indistinct under binocular microscope). 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 shiny, without microsculpture. Preepisternal plate wide, drop-like, 2× longer than wide, widely attached to metaventrite; posterior part of preepisternal elevation slightly overlapping over anterior margin of metaventrite; median part flat; bearing sparsely arranged shallow setiferous punctures; interstices without microsculpture.
Metathorax. Metaventrite distinctly longer than preepisternal elevation of mesothorax, median portion markedly differing from lateral portion in punctation and microsculpture; punctation of median portion consisting of small rounded punctures, interstices without microsculpture, shiny. Anterolateral ridges bent posteriad along lateral margin of metaventrite, concave laterally, not meeting together and bent posteriad mesally. Anterior margin of metaventrite not crenulate.
Abdomen. Ventrite 1 with additional longitudinal ridges laterally. Ventrites 2–5 without longitudinal ridges; posterior margin of all ventrites lacking denticles.
Male genitalia. Aedeagus 0.5 mm long, parameres 1.2× longer than phallobase. Parameres continuously narrowing apicad, bearing two short setae apically. Phallobase wide, 1.4× longer than wide. Median lobe slightly shorter than parameres, widely oval in shape, slightly narrowing at apex. Membranous lateral projections of median lobe absent. Gonopore absent.
Etymology
The new species is dedicated to our friend Robert S. Anderson (Canadian Museum of Nature, Ottawa), a very enthusiastic entomologist and collector of the type specimens.
Distribution
Oosternum andersoni sp. n. is a Cuban endemic species currently known from the western, central and eastern parts of the island (Fig. 61).
Habitat
Most specimens were sifted from wet leaf litter in evergreen montane forests.
Original Description
- Deler-Hernández, A; Cala-Riquelme, F; Fikáček, M; 2014: A review of the genus Oosternum Sharp of the West Indies (Coleoptera: Hydrophilidae: Sphaeridiinae) Deutsche Entomologische Zeitschrift, 61(1): 43-63. doi
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