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A new species of the genus Polycheria (Peracarida, Amphipoda, Dexaminidae) from South Korea

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Polycheria acercauda sp. nov., an amphipod symbiotic with sponges and ascidians in Korean waters, is established herein as a new species, along with a detailed description and illustrations. This new species is closely related to the following three known species of the genus from the Far East: Polycheria amakusaensis Hirayama, 1984, P. japonica Bulycheva, 1952, and P. orientalis Hirayama, 1984. However, Polycheria acercauda sp. nov. can be distinguished from the other congeners by the following combination of characteristics: (1) on antenna 2, the anterior margin of peduncular article 4 is pubescent; (2) on gnathopod 2, the palm is clearly distinct; (3) on uropod 3, the inner ramus is lined with plumose setae; and (4) on the telson, the apices are acute. This is the first report of the genus Polycheria Haswell, 1879 belonging to the family Dexaminidae Leach, 1814 from Korean waters.

Affiliations: 1: 1National Marine Biodiversity Institute of Korea, Seocheon 33662, South Korea ; 2: 2Department of Biology, Chosun University, Gwangju 61452, South Korea

3These authors contributed equally to this paper.
4Corresponding author; e-mail:

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1. Barnard J. L. , Karaman G. S. , 1991. "The families and genera of marine gammaridean Amphipoda (except marine gammaroids)". Rec. Aust. Mus., Vol 13(Suppl.): 1-417.
2. Bousfield E. L. , Kendall J. A. , 1994. "The amphipod superfamily Dexaminoidea on the North American Pacific coast; families Atylidae and Dexaminidae: systematics and distributional ecology". Amphipacifica, Vol 1: 3-66.
3. Bulycheva A. L. , 1952. "Novye vidy bokoplavov (Amphipoda, Gammaridea) iz Japonskogo Morja". Akamemiia Nauk SSSR, Trudy Zoologicheskogo Instituta, Vol 12: 195-250.
4. Foster J. M. , Thoma B. P. , 2016. " Polycheria josephensis, a new species of symbiotic amphipod (Crustacea, Amphipoda, Dexaminidae) from the northern Gulf of Mexico, with notes on its ecology". Zoosyst. Evol., Vol 92: 23-31.
5. Hirayama A. , 1984. "Taxonomic studies on the shallow water gammaridean Amphipoda of the West Kyushu, Japan III. Dexaminidae (Polycheria and Paradexamine)". Publ. Seto Mar. Biol. Lab., Vol 29: 187-230.
6. McClintock J. B. , Amsler M. O. , Koplovitz G. , Amsler C. D. , Baker B. J. , 2009. "Observation on as association between the dexaminid amphipod Polycheria antarctica f. acanthopoda and its ascidian host Distaplia cylindrical ". J. Crust. Biol., Vol 29: 605-608.
7. WoRMS, 2016. World Register of Marine species, available online at (accessed 13 February 2016).

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