Crucisternum ouboteri
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Ordo: Coleoptera
Familia: Hydrophilidae
Genus: Crucisternum
Name
Crucisternum ouboteri Girón & Short, 2018 sp. n. – Wikispecies link – ZooBank link – Pensoft Profile
Type material examined
Holotype (male): “SURINAME: Sipaliwini district/ 04°56.871'N, 55°10.911'W, 462 m/ Brownsberg Nature Park, forested/ stream with lots of detritus; leg./ Short, Maier, McIntosh; 4.viii.2012/ SR12-0804-01A” // “Barcode/ SEMC1113824/ KUNHM-ENT” (NZCS). Paratypes (155): GUYANA: Region IX: “2°06.492'N, 59°13.653'W, 274 m/ Parabara, N. side of river/ small flowing forested creek/ detritus margins & leaf packs/ leg. Short, Isaacs, Salisbury/ 3.xi.2013; GY13-1103-02A” (5, SEMC). FRENCH GUIANA: Roura: “[Patawa: crique/ Diamant]/ 16.xi.2007/ P. Queney réc.” (1, PQPC). SURINAME: Sipaliwini district: “2°21.776'N, 56°41.861'W, 237 m/ Camp 3, Wehepai; leg. Short &/ Kadosoe; sandy forest creek/ 4–6.ix.2010; SR10-0904-01A/ 2010 CI-RAP Survey” (2, SEMC); “2.97731°N, 55.38500°W, 200 m/ Camp 4 (low), Kasikasima; sandy stream on trail to METS camp/ 20.iii.2012; SR12-0320-02A/ leg. A. Short; 2012 CI-RAP Survey” (27, SEMC, including DNA voucher SLE 472); same, except “sandy creek, trail to Kasikasima/ 22.iii.2012; SR12-0322-02A” (12, SEMC); “04°42.480'N, 56°13.159'W, 24 m/ Raleighfallen Nature Reserve, trail/ to Raleighfallen; creek margins/ leg. Short, McIntosh, & Kadosoe/ 27.vii.2012; SR012-0727-03A” (1, SEMC); same data as holotype (89, NZCS, SEMC, MALUZ). VENEZUELA: Amazonas: “Cerro de la Neblina, basecamp 140m./ 0°50'N, 66°10'W/ 18 February 1985// Berlese of leaf packs/ among rocks in small/ stream in rainforest/ P.J. & P.M. Spangler, R. Faitoute, W. Steiner” (16, USNM, MIZA); same, except “rainforest at black light/ 21.ii.1985; leg. Spangler et al.” (1, USNM).
Differential diagnosis
Crucisternum ouboteri is very similar to C. vanessae and C. queneyi in the sharpness of the punctation (compare Fig. 2A–D to 2E–H and Fig. 1E–H). It is nearly indistinguishable from C. toboganensis based on external characters beyond coloration (uniform along the body in C. toboganensis, paler pronotum in C. ouboteri). Crucisternum ouboteri can be recognized by the fusiform aedeagus, with the apical third of the parameres parallel-sided with sinuate outer margins (Fig. 6A, B).
Description
Body length 2.0–2.4 mm, width 1.2–1.4 mm. General coloration dark brown on elytra, slightly paler on pronotum and head (Fig. 2A). Elytra with punctures rather sharply marked. Aedeagus fusiform, widest near mid length; median lobe gradually narrowing from basal fifth towards apical region; gonopore usually presented longitudinally on apical region of median lobe; apical third of parameres parallel-sided, with sinuate outer margins (Fig. 6A, B).
Etymology
Named in honor of Dr. Paul Ouboter, director of the National Zoological Collection of Suriname and leading authority on the biodiversity of Suriname. Dr. Ouboter’s assistance has been invaluable in our efforts to document the water beetle fauna of the country.
Distribution
French Guiana, Guyana, Suriname, and Venezuela (Amazonas). See Fig. 7. Collected at 24 – 462 m elevation.
Biology
This species is known from densely forested streams throughout much of the Guiana Shield region of South America (e.g., Fig. 8A–C). One specimen was collected at a UV light in southern Venezuela.
Original Description
- Girón, J; Short, A; 2018: Three new genera of acidocerine water scavenger beetles from tropical South America (Coleoptera, Hydrophilidae, Acidocerinae) ZooKeys, (768): 113-158. doi
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