Crucisternum ouboteri, Girón & Short, 2018

Giron, Jennifer C. & Short, Andrew Edward Z., 2018, Three new genera of acidocerine water scavenger beetles from tropical South America (Coleoptera, Hydrophilidae, Acidocerinae), ZooKeys 768, pp. 113-158 : 118

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Crucisternum ouboteri

sp. n.

Crucisternum ouboteri sp. n. Figs 2A-D View Figure 2 ; 4 View Figure 4 ; 5A, B View Figure 5 ; 6A, B View Figure 6 ; 7 View Figure 7 ; 8A-C View Figure 8

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 View Figure 2 to 2E-H and Fig. 1E-H View Figure 1 ). 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 View Figure 6 ).


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 View Figure 2 ). 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 View Figure 6 ).


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.


French Guiana, Guyana, Suriname, and Venezuela (Amazonas). See Fig. 7 View Figure 7 . Collected at 24 - 462 m elevation.


This species is known from densely forested streams throughout much of the Guiana Shield region of South America (e.g., Fig. 8A-C View Figure 8 ). One specimen was collected at a UV light in southern Venezuela.