Rhantus vicinus (AUBE, 1838) and R. blancasi GUIGNOT, 155, are redescribed and included in a probably monophyletic group (shared autapomorphy: anterior angles of pronotum as in Fig. 5a, b). A third species belonging to that group is described from Ecuador: R. crypticus sp. n. The latter and R. blancasi are sister species, both are regarded as the sister group of R. vicinus. - Rhantus luederwaldti ZIMMERMANN, 1923, is considered to be a junior subjective synonym of R. duponti (AUBE, 1838). The female of R. souzannae BALKE, 1990, is described for the first time. A lectotype is designated for Dyticus (sic!) nitidus BRULLE, 1838, which is a primary homonym of D. nitidus F., 1801. The preoccupied name is replaced by orbignyi nom. n. The lectotype designation for that species by TREMOUILLES (1986) is considered to be invalid.
CITATION STYLE
Balke, M. (1992). Taxonomical study on Neotropic water beetles of the genus Rhantus Dejean (Insecta, Coleoptera: Dytiscidae). Reichenbachia, 29, 27–39.
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