Review of the New World Species of Pseudodiaptomus (Copepoda: Calanoida), with a Key to the Species

This present study continues a review of the genus Pseudodiaptomus and clarifies the status of the American species. Two new species, P. longispinosus, and P. panamensis, and an unidentified species, along with the recent introduction of P. marinus, bring to 15 the number of species in this region. Previously misidentified species are placed in synonymy and extended zoogeographical ranges are presented. The Americanus species group and subgroups including 13 species are defined. A key to all species found in American coastal waters is presented.