Philometra sawara sp. n. and a redescription of Philometra sciaenae Yamaguti, 1941 and Philometra nemipteri Luo, 2001 (Nematoda: Philometridae): a morphological and molecular approach
2008
Quiazon, K.M.A.,The University of Tokyo (Japan). Dept. of Aquatic Biosciences | Yoshinaga, T.,The University of Tokyo (Japan). Dept. of Aquatic Biosciences | Ogawa, K.,The University of Tokyo (Japan). Dept. of Aquatic Biosciences
Morphological data and molecular analyses are used to describe the taxonomy of philometrid nematodes of the genus Philometra, found in the gonads of marine fishes in Japan. A new Philometra species, P. sawara sp. n., is described based on male and female specimens collected from the gonads of Scomberomorus niphonius. Two additional species, Philometra nemipteri and Philometra sciaenae, are confirmed as valid species and are redescribed based on specimens collected from the gonads of Nemipterus virgatus and Pennahia argentata, respectively. Male P. nemipteri are first reported and described in this study. Redescriptions of female P. nemipteri and male and female P. sciaenae were also necessary based on our morphological observations. A molecular comparison of the internal transcribed spacer 2 (ITS2) region of the ribosomal DNA between P. sawara, P. nemipteri, P. sciaenae, and previously reported philometrid nematodes from the genus Philometra and Philometroides supports the conclusion that the three Philometra species in the current study are independent. An ITS2-derived neighbour-joining tree, consisting of both the current specimens and previously described Philometra and Philometroides species, is also presented.
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