Primocerus is a Neotropical genus of water scavenger beetle in the family Hydrophilidae represented by nine described species known from the Guiana Shield Region.
Taxonomy The genus Primocerus was described for the first time by Girón & Short in 2019.
It belongs in the subfamily Acidocerinae and contains nine described species from Brazil (Pará), Guyana, Suriname, and Venezuela.
Description Small to medium-sized beetles (2.4–4.9 mm), smooth and shiny dorsally, orange-brown, reddish brown, or dark brown in coloration, with moderately long maxillary palps. The elytral punctation ranges from shallow to strongly marked, forming impressed serial striae; all the species bear a well defined sutural stria. A complete diagnosis was presented by Girón and Short.
Habitat According to Girón and Short, "The habitats occupied by members of Primocerus range from forested pools to seepages".
Species
Primocerus cuspidis Girón and Short, 2019 Primocerus gigas Girón and Short, 2019 Primocerus maipure Girón and Short, 2019 Primocerus neutrum Girón and Short, 2019 Primocerus ocellatus Girón and Short, 2019 Primocerus petilus Girón and Short, 2019 Primocerus pijiguaense Girón and Short, 2019 Primocerus semipubescens Girón and Short, 2019 Primocerus striatolatus Girón and Short, 2019
References