Crucisternum ouboteri , Giron, Jennifer C. & Short, Andrew Edward Z., 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

publication ID

http://dx.doi.org/10.3897/zookeys.768.24423

publication LSID

lsid:zoobank.org:pub:399BCC3E-9D6F-4231-870E-05C79B9FD4B0

persistent identifier

http://treatment.plazi.org/id/AD02C73E-2E54-4352-96C4-584A5D6B6982

taxon LSID

lsid:zoobank.org:act:AD02C73E-2E54-4352-96C4-584A5D6B6982

treatment provided by

ZooKeys by Pensoft

scientific name

Crucisternum ouboteri
status

sp. n.

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

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. 2 A–D to 2 E–H and Fig. 1 E–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. 8 A–C). One specimen was collected at a UV light in southern Venezuela.