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A new species of Phyllodiaptomus Kiefer (Copepoda, Calanoida) from the Shatt al-Arab River, southern Iraq

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A new species of the genus Phyllodiaptomus Kiefer, 1936, is herein described as Phyllodiaptomus irakiensis sp. nov. from the Shatt al-Arab River, southern Iraq. The species is closely similar to Phyllodiaptomus blanci (Guerne & Richard, 1889), but can be distinguished from that species by the left metasomal wing in the female, the second and third urosomal somites each having a conspicuous hyaline lobe on the dorsal side, the presence of fine hairs at the outer and inner margins of the furcal rami, and the structure of the fifth pair of legs in both sexes; moreover, the anal segment along with the furcal rami in the male are curved to the right inner side of the main axis of the urosome, in addition to differences noticed in the right antennule, etc. The new species is the eleventh member of the genus (cf. Sanoamuang & Teeramaethee, 2006) and the second species recorded from southern Iraq. Une espèce nouvelle du genre Phyllodiaptomus Kiefer, 1936, Phyllodiaptomus irakiensis sp. nov. est décrite ici du Shatt al-Arab, au sud de l'Iraq. L'espèce est proche de Phyllodiaptomus blanci (Guerne & Richard, 1889), mais peut en être distinguée par l'expansion gauche du dernier somite thoracique femelle, par les deuxième et troisième urosomites qui présentent chacun dorsalement un lobe hyalin bien visible, par la présence de fins poils aux bords interne et externe des rames furcales, et par la structure de la cinquième paire de pattes dans les deux sexes; de plus, le somite anal ainsi que les rames furcales du mâle sont incurvés vers le bord interne droit de l'axe principal de l'urosome, s'ajoutant aux différences observées sur l'antennule droite, etc. La nouvelle espèce est la onzième du genre (cf. Sanoamuang & Teeramaethee, 2006) et la seconde connue du sud de l'Iraq.

Affiliations: 1: Department of Marine Biology, Marine Science Centre, Basrah University, Basrah, Iraq


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