Hydrochus leei, Perkins, 2019

Perkins, Philip D., 2019, Taxonomy of Venezuelan water beetles in the genus Hydrochus Leach, 1817, and an analysis of male genitalia morphology (Coleoptera: Hydrochidae), Zootaxa 4708 (1), pp. 1-59: 50-52

publication ID

https://doi.org/10.11646/zootaxa.4708.1.1

publication LSID

lsid:zoobank.org:pub:09F24F0B-5090-4089-A525-8E5150C91EF7

persistent identifier

http://treatment.plazi.org/id/03A587E7-A852-FFD7-0CBA-1029FE25934A

treatment provided by

Plazi

scientific name

Hydrochus leei
status

new species

Hydrochus leei   new species

Figs. 1 View FIGURE 1 , 28 View FIGURE 28

Type Material. Holotype (male): “Venezuela: Barinas State: 70° 23.867’ W, 8° 16.954’ N, 70° 23.867’ W, 149m, Ciudad Bolivia, 25.i.2012, leg. Short, Arias & Gustafson; Muddy creek ; VZ12-0125-01A” ( MIZA) GoogleMaps   . Paratypes (261): Venezuela: Anzoategui: VZ10-0204-01A (2 SEMC)   . Apure: VZ09-0118- 02X (3 SEMC)   ; VZ09-0118 View Materials - 03X (17 SEMC)   ; VZ09-0118 View Materials - 04X (1 SEMC)   . Barinas: Same data as holotype (54 SEMC)   ; VZ09-0714 View Materials - 05 View Materials A (2 SEMC)   ; VZ12-0125 View Materials - 02 View Materials A (8 SEMC)   ; Barrancas Research Sta., Rio Yuca , 1 II 1978, 400 ft, seasonal forest, black light, J. B. Heppner (4 NMNH)   ; Rio Caparo Res. Station , 32km E El Canton, b-light, 3-5 II 1978, seasonal forest, J. B. Heppner (4 NMNH)   . Cojedes: VZ12-0120-03A (1 SEMC)   , VZ12-0121 View Materials - 03 View Materials A (1 SEMC)   . Delta Amacuro: VZ10-0203- 01A (2 SEMC)   , VZ10-0203 View Materials - 02 View Materials A (8 SEMC)   . Guarico: Calabozo (44 km S), Hato Masaguaral , 4 Mar 1986, PJSpangler, colln#22, large lake (73 NMNH)   ; Corozo Pando , (8kmN. NMNH)   , 20–21 June 1984, blacklight, F. W. Eiland & V. Linares (1 NMNH)   ; Calabozo (44 km S), Hato Masaguaral , 6 Mar 1986, stock tank, PJSpangler, colln#29 (1 NMNH)   ; Calabozo (44 km S), Hato Masaguaral , 6 Mar 1986, PJSpangler, colln#30 (2 NMNH)   ; Calabozo (44 km S), Hato Masaguaral , 5 Mar 1986, PJSpangler, colln#24 (4 NMNH)   ; Calabozo (44 km S), Hato Masaguaral , 4 Mar 1986, large lake, PJSpangler, colln#22 (9 NMNH)   ; Calabozo (44 km S), Hato Masaguaral , 6 Mar 1986, gate lagoon, PJSpangler, colln#28 (4 NMNH)   ; Corozo Pando , II-12-1969, P. & P. Spangler (1 NMNH)   ; San Fernando , II-12- 1969, P. & P. Spangler (26 NMNH)   ; Calabozo (44 km S), Hato Masaguaral , 6 Mar 1986, PJSpangler & SBeaujon, colln#31 (23 NMNH)   ; 32 km SW. Calabozo II-11-1969, P. & P. Spangler (5 NMNH)   . Monagas: VZ10-0719-01A (1 SEMC)   . Yaracuy: La Hoya, 100m, 28-30-VI-1973, en la luz, F. Fernandez, Y. J. Salcedo, J. Clavijo (4 SEMC)   . Zulia: VZ12-0127-01A (1 SEMC)   .

Differential Diagnosis. Among Venezuelan species, recognized by the combination of small size (ca. 1.92–2.31 mm), the dorsum bright silver metallic, the pronotum with shallow depressions with moderately dense punctation, the pronotal shape, the small black spots on the elytra, and the male genitalia ( Fig. 28 View FIGURE 28 ; described below). Differentiation from other similarly small sized species with similarly shaped pronotum will require dissection of males.

Description. Habitus as illustrated ( Fig. 28 View FIGURE 28 ). Size: holotype (length/width, mm): body (length to elytral apices) 1.97/0.76; head width 0.53; pronotum l/w 0.45/0.50; PA 0.50; PB 0.42; elytra 1.18/0.76. Body size small (ca. 1.92–2.31 mm). Dorsum bright silver metallic, with slight bluish iridescence, elytra with several small black spots. Legs testaceous, with tibiofemoral joints darker. Punctation on elytra ca. 2– 3x that of pronotum. Elytra interstriae ca. 0.5– 1x strial puncture diameter. Interstria 9 th more convex than others, overhanging 10 th interstria. Usual area of callus on 5 th not raised.

Pronotum slightly wider than long (as ca. 45/50), widest at anterior margin, markedly narrowed at base, sides very slightly sinuate, smooth; anterior margin weakly bisinuate; depressions moderately shallow, with punctation denser than that of low reliefs.

Elytra with spaces between strial punctures narrow ridges to ca. 0.5x their diameter; apices rather sharply conjointly rounded in dorsal view, in lateral view outer margin with very slight angulation.

Ventral characters: Mentum moderately coarsely and moderately densely punctate, with shallow median fovea. Submentum with two small shallow foveae.

Male genitalia ( Fig. 28 View FIGURE 28 ) general characters: genitalia very small; parameres extending well beyond distal end of aedeagus, tips in dorsal/ventral views wide in proximal part, narrowing apically, with medial margins parallel, in lateral view tips arcuate slightly toward ventrad, and markedly narrowing apically; basal piece long, longer than parameres, tapering from distal end to base, slightly constricted just before orifice, in lateral view slightly arcuate, orifice with rim weakly sclerotized and characteristically shaped; aedeagus narrow, narrowing slightly from base to apex.

Dorsal surface: adtl lacking; pdmm distinctively sclerotized in distal ½, sclerotized area becoming wider from apex until terminating abruptly slightly before midlength of paramere, from which point pdmm becoming narrowly separated and overlapping alm; adbl moderately long.

Ventral surface: pvmm more widely separated than pdmm, contiguous with or nearly so alm.

Etymology. This new species is named for John Leroy Hellman, known as Lee by his friends, in recognition of the hundreds upon hundreds of Hydrochus   specimens he carefully mounted and labeled, and the many, many males that he skillfully dissected.

MIZA

Museo del Instituto de Zoologia Agricola Francisco Fernandez Yepez

SEMC

University of Kansas - Biodiversity Institute

NMNH

Smithsonian Institution, National Museum of Natural History