Abstract
A new species of Helochares Mulsant, 1844 (Hydrophilidae: Acidocerinae) from Brazil is described and illustrated. Helochares (s. str.) atlanticus sp. nov. is distinct mainly by characteristics of the aedeagus whose phalobase is short, narrowed on basal third; parameres are thick, constricted on apical quarter, with small tooth-like projection on outer margin near apex; dorsal lobe longer than ventral lobe, shorter than parameres, very wide at base, abruptly narrowing toward apex until about half of its length where it dilates and divides into two long and narrow projections apart from each other at base, but turned inward at apex; ventral lobe acuminate and symmetrical. The rounded emargination on anteromedial margin of labrum bearing small tooth-like projections and the convex and slightly elevated mesoventral process, without high-elevated carina, also helps in identifying the species. Specimens of the new species were collected in the mountain region of the state of Rio de Janeiro (municipality of Teresópolis) and in the north coast of the state of São Paulo (municipality of Ubatuba), both localities in Southeastern Brazil. Helochares (s. str.) oculatus Sharp, 1882 and Helochares (Sindolus) femoratus (Brullé, 1841) are recorded for the first time from the state of Rio de Janeiro.
Highlights
The description and measurements of the new species were based on the holotype
Photographs were taken from paratype specimens with a Microptics system
Following the descriptions of FERNÁNDEZ (1982a, b, 1989) we describe in this paper the median lobe divided into sclerotized dorsal lobe and membranous ventral lobe, which may be more or less developed in the South American species
Summary
All specimens were examined using a binocular Leica S8AP0 microscope (80x). Measurements were taken using a binocular Coleman microscope (100x) with the aid of an ocular micrometer. (Sindolus) present a wide aedeagus, usually with sinuate outer margins, median lobe shorter than parameres Species of these subgenera show intraspecific variation – e.g., on dorsal sculpture patterns – and homogeneity in many characters – e.g., on ventral aspect of the thoracic plates, legs and abdomen – and differences between species are found mainly in the male genitalia. Aedeagus (Fig. 7) with dorsal lobe longer than ventral lobe and shorter than parameres, very wide at base, abruptly narrowing toward apex until about half of its length where it dilates and divides into two long narrow projections; projections are apart from each other at base but are turned inward and touch at apex; apex rounded. Mesoventrite convex, elevated medially on posterior half, bearing long setae, slightly carinate anteriorly (Fig. 6). These ponds were covered and shaded in the border of the forest, or were in open areas
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