Hydrochus hellmani, 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 : 40-42

publication ID

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

publication LSID

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

DOI

https://doi.org/10.5281/zenodo.5941801

persistent identifier

https://treatment.plazi.org/id/03A587E7-A844-FFCD-0CBA-1517FB7390A6

treatment provided by

Plazi

scientific name

Hydrochus hellmani
status

sp. nov.

Hydrochus hellmani View in CoL new species

Figs. 1 View FIGURE 1 , 22 View FIGURE 22

Type Material. Holotype (male): Venezuela: “ Bolivar: Upata (69 km SE), 31 Oct. 1982, John L. Hellman ” ( NMNH).

Differential Diagnosis. Among Venezuelan species, recognized by the combination of small size (ca. 2.37 mm), the pronotum with moderately deep impressions separated by narrow reliefs, the elytra with large and deep strial punctures, interstriae and spaces between punctures narrow ridges, and the male genitalia ( Fig. 22 View FIGURE 22 ; described below). Completely reliable determinations will include dissection of males.

Description. Habitus as illustrated ( Fig. 22 View FIGURE 22 ). Size: holotype male (length/width, mm): body (length to elytral apices) 2.37/0.92; head width 0.60; pronotum l/w 0.53/0.57; PA 0.55; PB 0.47; elytra 1.50/0.92. Body size small (ca. 2.37 mm). Dorsum black, with slight iridescence, elytra without black spots. Legs dark brown. Punctation on elytra large, deep, ca. 2– 3x that of pronotum. Elytra interstriae much narrower than strial puncture diameter, narrow ridges. Interstria 9 th more convex than others, weakly overhanging 10 th interstria. Usual area of callus on 5 th very weakly raised.

Pronotum slightly wider than long (as ca. 53/57), widest at anterior margin, narrowed at base, sides very weakly arcuate, smooth; anterior margin very weakly bisinuate; depressions moderately deep, reliefs narrow.

Elytra with spaces between strial punctures narrow ridges; apices rather sharply conjointly rounded in dorsal view, in lateral view outer margin with slight angulation.

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

Male genitalia ( Fig. 22 View FIGURE 22 ) general characters: genitalia stout; paramere tips tapering and arcing slightly toward midline, extending slightly beyond distal end of aedeagus, parameres in lateral view arcuate, and wider than dorsal/ ventral views; basal piece much shorter than parameres, tapering from distal end to base, orifice sclerotized, asymmetrical; aedeagus lanceolate, lateral margins moderately widely sclerotized, greatest width at about midlength, tapering apically, with internal lumen in basal ½, gonopore apical.

Dorsal surface: adtl subapical; pdmm widely overlapping alm, especially in distal 1/2; adbl moderately large.

Ventral surface: avtl subbasal; pvmm approximating alm.

Etymology. Named for John Leroy Hellman, who collected the only known specimen.

NMNH

Smithsonian Institution, National Museum of Natural History

Kingdom

Animalia

Phylum

Arthropoda

Class

Insecta

Order

Coleoptera

Family

Hydrochidae

Genus

Hydrochus

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