Helochares

Short, Andrew Edward Z. & Girón, Jennifer C., 2018, Review of the Helochares (Hydrobaticus) MacLeay of the New World (Coleoptera: Hydrophilidae: Acidocerinae), Zootaxa 4407 (1), pp. 29-50 : 48-49

publication ID

https://doi.org/10.11646/zootaxa.4407.1.2

publication LSID

lsid:zoobank.org:pub:B45E9ABD-CB52-4EE7-91D6-783E8E958AC5

DOI

https://doi.org/10.5281/zenodo.3803384

persistent identifier

https://treatment.plazi.org/id/676A87E0-FFB7-B15E-2392-FB2D47900F17

treatment provided by

Plazi

scientific name

Helochares
status

 

Key to the New World species of the Helochares subgenus Hydrobaticus

1. Elytra with distinct rows of serial punctures, sometimes deeply impressed into grooves (e.g., Fig. 2A View FIGURE 2 , C–E). Size variable (4.2– 6.6 mm). Widely distributed............................................................................. 2

- Elytra without rows of serial punctures ( Figs. 2B View FIGURE 2 , 4 View FIGURE 4 ). Size larger than 5.5 mm. Mexico and Central America.............. 8

2. Abdominal pubescence sparse and not uniformly distributed on each ventrite ( Fig. 6A View FIGURE 6 ). Abdominal ventrites uniformly very dark brown to almost black in coloration. Elytra with rows of serial punctures not impressed into striae............................................................................................ H. normatus (LeConte) (in part)

- Abdominal pubescence dense and uniform, not appearing sparse or absent on anterior half of each ventrite (e.g. Fig. 6 View FIGURE 6 B–D). Abdominal ventrites variously colored. Elytra with rows of serial punctures impressed into striae or not................. 3

3 Size larger (> 5.8 mm). Elytral serial punctures not impressed into striae or only very weakly so; absent or almost appearing absent anteromedially ( Fig. 2A View FIGURE 2 ).............................................................. H. trujillo n. sp.

- Size variable (4.2–6.0 mm). Elytra with rows of serial punctures impressed into striae or not; rows distinctly present anteromedially............................................................................................... 4

4 Abdominal ventrites pale in color, either uniformly yellowish brown or yellowish brown on lateral thirds with median third darker brown......................................................................................... 5

- Abdominal ventrites uniformly dark brown to almost black in color..............................................6

5 Parameres of aedeagus truncate at apex, with outer corners widely rounded ( Fig. 7 View FIGURE 7 F–H). More southern distribution ( Panama, Ecuador, Venezuela)....................................................................... H. nexus n. sp.

- Parameres of aedeagus with apex oblique to truncate, with outer corners widely rounded ( Fig. 8 View FIGURE 8 ). More northern distribution (this rarer form known from Mexico)............................................ H. normatus (LeConte) (in part)

6 Clypeus pale in coloration, not darkened medially ( Fig. 5A View FIGURE 5 ). Eastern North America............. H. maculicollis Mulsant

- Clypeus distinctly darkened medially ( Fig. 5E, H View FIGURE 5 ). South America............................................... 7

7 Pronotum almost entirely darkly colored ( Fig. 2D View FIGURE 2 ). Size smaller (4.7–4.8 mm). Ecuador................ H. zamora n. sp.

- Pronotum only darkened on central disc ( Fig. 2E View FIGURE 2 ). Size larger (5.2–5.5 mm). Peru............................ H. sp. A

8 Clypeus pale in coloration, not darkened medially ( Fig. 5G View FIGURE 5 ). Aedeagus with median lobe broadly rounded, with only a small “pinched” apex ( Fig. 7K View FIGURE 7 )............................................................... H. championi Sharp

- Clypeus distinctly darkened medially ( Fig. 5I View FIGURE 5 ). Aedeagus with median lobe tapered to a point at apex ( Fig. 7 View FIGURE 7 I– J)......... 9

9 Aedeagus with apex of parameres rounded ( Fig. 6I View FIGURE 6 ); lateral outer margins of parameres parallel, slightly constricted near midlength; maximum width of aedeagus at basal half, nearly as wide as maximum width of aedeagus at apical half................................................................................................... H. politus n. sp.

- Aedeagus with apex of parameres truncate ( Fig. 6J View FIGURE 6 ); lateral outer margins of parameres parallel along basal two thirds, slightly constricted at two thirds, diverging along apical third; maximum width of aedeagus at basal half, clearly narrower than maximum width of aedeagus at apical half........................................................... H. laevis n. sp.

Kingdom

Animalia

Phylum

Arthropoda

Class

Insecta

Order

Coleoptera

Family

Hydrophilidae