Taxonomy of Venezuelan water beetles in the genus Hydrochus Leach, 1817, and an analysis of male genitalia morphology (Coleoptera: Hydrochidae) Perkins, Philip D. Zootaxa 2019 2019-12-12 4708 1 1 59 8Y4PC Perkins, 2019 Perkins 2019 [151,429,657,684] Insecta Hydrochidae Hydrochus Animalia Coleoptera 22 23 Arthropoda species bicarinatus sp. nov.   Figs. 1, 15   Type Material.   Holotype(male):“Venezuela: Zulia State: 8° 33.108’ N, 72° 20.163’ W,  47m, Puente del Zulia, finca by road, leg. Short, Arias & Gustafson, lagoon,  27.i.2012, VZ12-0127-01A” ( MIZA).   Paratypes(180): Venezuela: Anzoategui: Pariaguan,  13-VIII-1967, J. & B. Bechyneleg. (2 SEMC).   Apure:VZ09-0118-  03X(1 SEMC).   Barinas:VZ12-0126-01B (1 SEMC); VZ12-0125- 01A (1 SEMC); 10 KmNE Barinas,  II-23-1969, P. & P. Spangler(2 NMNH).   Bolivar: El Dorado( 65 kmS),  1 Nov. 1982, John L. Hellman(5 NMNH).   Falcon:VZ09-0710-03B (5 SEMC);  Tucacas,  1m,  4.VIII.1989, S. & J. Peck, coastal lagoon and coconut grove, ex: UV trap, 89-287 (1 CMN).   Guarico:VZ10-0706-01A (1 SEMC);  San Fernando,  II-12-1969, P. & P. Spangler(54 NMNH);  15 km S. Calabozo  II-9-13-1969, collected in Lago de Los Patos, P. & P. Spangler(9 NMNH);  Calabozo  II-7-1969, P. & P. Spangler(1 NMNH);  Corozo Pando, (8kmN),  17–18 June 1984, blacklight, F. W. Eiland& V. Linares(60 NMNH);  Calabozo( 44 kmS), Hato Masaguaral,  6 Mar 1986, PJSpangler, colln#30 (7 NMNH);  Calabozo( 44 kmS), Hato Masaguaral,  6 Mar 1986, gate lagoon, PJSpangler, colln#28 (1 NMNH);  Calabozo( 44 kmS), Hato Masaguaral,  65 Mar1986, PJSpangler, colln#25 (3 NMNH);  Calabozo( 44 kmS), Hato Masaguaral,  7 Mar 1986, PJSpangler, colln#32 (3 NMNH);  Calabozo( 44 kmS), Hato Masaguaral,  6 Mar 1986, PJSpangler & SBeaujon, colln#31 (1 NMNH);  Calabozo( 44 kmS), Hato Masaguaral,  4 Mar 1986, large lake, PJSpangler, colln#22 (7 NMNH).   Monagas:VZ10- 0202-01B (1 SEMC); VZ10-0719- 01A (1 SEMC);  42 km. SE. Maturin,  June 18, 1958, Arnold Menke(2 NMNH).   Tachira:VZ09-0716-05A (1 SEMC).   Trujillo:VZ12-0128-06A (3 SEMC).   Yaracuy: La Hoya,  100m,  28-30-VI- 1973, en la luz, F. Fernandez, Y. J. Salcedo, J. Clavijo(6 SEMC).   Zulia: Samedata as holotype(1 SEMC).  Differential Diagnosis.Among Venezuelan species, males recognized by the presence of a pair of submedian, longitudinal, parallel carinae of the metaventrite. The dorsal sculpture is only moderately coarse, with the elytral strial punctures about as wide as the interstriae, but with the spaces between punctures of a row less than puncture diameter. The male genitalia are distinctive ( Fig. 15; described below). and should be examined for reliable determinations.   Description. Size: holotype(length/width, mm): body (length to elytral apices) 3.37/1.17; head width 0.80; pronotum l/w 0.77/0.80; PA 0.67; PB 0.60; elytra 2.13/1.17. Habitus as illustrated ( Fig. 15), size ca. 2.77–3.62 mm. Dorsum grey to gold, with slight iridescence, elytra with black spots. Legs testaceous, with tibiofemoral joints darker. Dorsal punctation small to moderately large, larger on elytra than pronotum. Elytra interstriae ca. 1xstrial puncture diameter. Interstria 9 thmore convex than others, not overhanging 10 thinterstria. Callus on 5 thsmall. Pronotum slightly wider than long, widest just behind anterior margin, narrowed at base, sides arcuate or very weakly sinuate, smooth; depressions moderately deep, pit-like geminate depressions near posterior angles rather large and deep. Elytral strial punctures ca. 2– 3xsize of pronotal punctures, spaces between them less than their diameter; apices conjointly rounded in dorsal view, in lateral view outer margin with slight angulation. Ventral characters: Mentum coarsely punctate, with median fovea. Submentum with two foveae. Metaventrite of male with pair of submedian longitudinal parallel carinae. Male genitalia ( Fig. 15) general characters: paramere tips pointed, slightly asymmetrical, in lateral view tips slightly upturned; adeagus very slender, with well sclerotized lateral margins (alsm); basal piece orifice with rim strongly sclerotized. Dorsal surface: adtl at about distal 1/3; adbl large; pdmm overlapping aedeagus lateral margins over about middle 1/3. Ventral surface: avtl near midlength; pvmm closely approximating alm.   Etymology.Named in reference to the metaventral carinae. 2521263788 2012-01-27 MIZA Short 47 8.5518 Puente del Zulia 1 -72.33605 22 23 1 holotype 2521263827 1967-08-13 SEMC J. & B. Bechyne Venezuela Pariaguan 22 23 1 Anzoategui paratype 2521263874 [1030,1433,836,863] 2003-10 SEMC Venezuela Apure 22 23 1 Apure paratype 2521263884 [151,893,872,899] SEMC Venezuela Barinas 22 23 VZ12-0125, 01 1 Barinas paratype 2521263785 1969-02-23 NMNH P. & P. Spangler Venezuela Barinas Km 22 23 1 Barinas paratype 2521263838 [290,1114,908,935] 1982-11-01 NMNH El Dorado & John L. Hellman Venezuela Bolivar 22 23 1 Bolivar paratype 2521263786 SEMC Venezuela Falcon 22 23 1 Falcon paratype 2521263847 [251,1433,945,971] 1989-08-04 CMN S. & J. Peck Venezuela 1 Tucacas 22 23 1 Falcon paratype 2521263797 [151,576,980,1007] SEMC Venezuela Guarico 22 23 1 Guarico paratype 2521263869 [587,1215,980,1007] 1969-02-12 NMNH P. & P. Spangler Venezuela San Fernando 22 23 1 Guarico paratype 2521263857 1969-02-09 1969-02-13 1969-02-09 NMNH S. Calabozo & P. & P. Spangler Venezuela Lago de Los Patos 22 23 1 Guarico paratype 2521263901 1969-02-07 NMNH P. & P. Spangler Venezuela Calabozo 22 23 1 Guarico paratype 2521263801 [262,1319,1053,1080] 1984-06-17 1984-06-18 1984-06-17 NMNH F. W. Eiland & V. Linares Venezuela Corozo Pando 22 23 1 Guarico paratype 2521263895 1986-03-06 NMNH Venezuela Hato Masaguaral Calabozo 22 23 1 Guarico paratype 2521263795 1986-03-06 NMNH Venezuela Hato Masaguaral Calabozo 22 23 1 Guarico paratype 2521263880 1965-03 NMNH Venezuela Hato Masaguaral Calabozo 22 23 1 Guarico paratype 2521263899 1986-03-07 NMNH Venezuela Hato Masaguaral Calabozo 22 23 1 Guarico paratype 2521263800 [295,1432,1197,1223] 1986-03-06 NMNH Venezuela Hato Masaguaral Calabozo 22 23 1 Guarico paratype 2521263835 [151,1228,1233,1259] 1986-03-04 NMNH Venezuela Hato Masaguaral Calabozo 22 23 1 Guarico paratype 2521263875 SEMC Venezuela Monagas 22 23 VZ10-0719, 01 1 Monagas paratype 2521263840 [726,1433,1268,1295] 1958-06-18 NMNH Arnold Menke Venezuela Maturin 22 23 1 Monagas paratype 2521263872 [151,574,1304,1331] SEMC Venezuela Tachira 22 23 1 Tachira paratype 2521263849 [584,1006,1304,1331] SEMC Venezuela Trujillo 22 23 1 Trujillo paratype 2521263883 1973-06-28 1973-06-30 1973-06-28 SEMC F. Fernandez & Y. J. Salcedo & J. Clavijo Venezuela 100 La Hoya 22 23 1 Yaracuy paratype 2521263831 [889,1347,1340,1367] SEMC Same Venezuela Zulia 22 23 1 Zulia holotype