title: A new species of Pseudodiaptomus (Crustacea, Copepoda, Calanoida, Pseudodiaptomidae) from the Prasae River Estuary, Gulf of Thailand.
abstract: A new species of the calanoid copepod genus Pseudodiaptomus was collected from the Prasae River Estuary, Rayong Province, on the eastern coast of the Gulf of Thailand. This species is definitely assigned to the lobus species group sensu Walter (1986a). The female of the new species differs from other congeners in the elongate genital double-somite with a blunt process ventrally and the second urosomite about 2.54 times as long as wide. The male is also easily distinguished from other congeners by the structure of the right fifth leg. The present new species is a euryhaline species and occurred in brackish waters with salinity ranging from 0.7 to 23.3. Its breeding season may be from June to October, as indicated by the presence of egg-sacs.
authors.affiliation: Institute of Marine Science, Burapha University, Muang, Chonburi 20131,Thailand.
authors.forename: Khwanruan
authors.initials: K
authors.lastname: Srinui
authors.forename: Shuhei
authors.initials: S
authors.lastname: Nishida
authors.forename: Susumu
authors.initials: S
authors.lastname: Ohtsuka
keywords: Calanoida; Copepoda; Gulf of Thailand; Prasae River; Pseudodiaptomus; new species