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Longipedia Thailandensis Sp. Nov. (Copepoda, Harpacticoida) from a Brackish Water Treatment Pond, Samut Sakhon, Thailand

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A new species belonging to the Longipediidae G. O. Sars, 1903 (Copepoda, Harpacticoida) is described from a brackish water treatment pond in Samut Sakhon Province, Thailand. This is the first record of the family Longipediidae from Thailand.

The new species, Longipedia thailandensis, is similar to L. kikuchii Itô, 1980 and L. nichollsi Wells, 1980 in carrying a median apical spine on the third segment of the endopod of P2 with a large tooth about midway, in the females. It differs from its congeners in having spinules ventrally, though in general less spinular ornamentation, on the abdomen. The shape and setal length of the female P5 exopod is similar to that of the female of L. nichollsi, but the minute spinular ornamentation pattern on the anterior surface is different. The latter characters are presumed to be apomorphies of the new species. Une nouvelle espèce appartenant à la famille des Longipediidae G. O. Sars, 1903 (Copepoda, Harpacticoida) est décrite d'un bassin de traitement d'eau saumâtre de la province de Sakhon, Thaïlande. C'est la première fois que l'on mentionne la présence de la famille des Longipediidae en Thaïlande.

La nouvelle espèce, Longipedia thailandensis, est analogue à L. kikuchii Itô, 1980 et L. nichollsi Wells, 1980 par l'épine apicale médiane portée par le troisième segment de l'endopodite de P2, présentant une grande dent insérée environ en son milieu, chez les femelles. Elle diffère de ses congénères par la présence de spinules ventrales sur l'abdomen, bien que l'ornementation en spinules soit moindre en général. La forme et la longueur des soies de l'exopodite de la P5 femelle sont analogues à celles de L. nichollsi, mais le patron d'ornementation en minuscules spinules à la surface antérieure est différente. Ces derniers caractères sont supposés être des apomorphies de la nouvelle espèce.

Affiliations: 1: Department of Biology, Ramkhamhaeng University, Bangkok 10240, Thailand;, Email:; 2: Department of Biology, Ramkhamhaeng University, Bangkok 10240, Thailand


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