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A new species of Acartia (Copepoda, Calanoida) from the Philippines, based on morphological and molecular analyses
Khwanruan Srinui1, Susumu Ohtsuka2, Ephrime B Metillo3
1Institute of Marine Science, Burapha University, Muang, Chon Buri 20131, Thailand Burapha University Chon Buri Thailand.
Abstract:
A new species of Acartia (Odontacartia), A. (O.) edentatasp. n., was collected from Leyte Island in the Philippines. Morphologically, the new species resembles A. (O.) pacifica Steuer, 1915. The female of the new species differs from other species of the A. (O.) erythraea Giesbrecht, 1889 species group in the absence of a pair of sharp spines on the posterior border of the genital double-somite and absence of setules on the lateral margins of urosomites 1-3. Unlike other congeners of the species group, males of the new species lack fine setules along the posterior margin of the prosome. Comparison of the new species with A. (O.) pacifica by pairwise distance data for the 16S (282 bp) gene indicates that these species differ by 20-21%, while the COI gene (636 bp) indicates a difference of 16-17%. The new species seems to be a coastal, occurring in warm waters having a salinity of 33.5.
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