- The Japanese Society of Fish Pathology
- 魚病研究 (ISSN:0388788X)
- vol.50, no.4, pp.183-191, 2015
<i>Paradeontacylix buri</i> n. sp. is described based on specimens from the afferent branchial arteries of the Japanese amberjack <i>Seriola quinqueradiata</i> cultured in Mie and Oita Prefectures, Japan. The new species can be differentiated from congeners by a body of up to 4.15 mm with lanceolate tegumental spines of the same size throughout the body, uterus ascending after leaving the oötype and the vitellarium not extending posterior to the ovary. <i>P. buri</i> n. sp. is unique among <i>Paradeontacylix</i> species from <i>Seriola</i> spp. in having the same size tegumental spines throughout the body. A phylogenetic analysis based on the sequences of the internal transcribed spacer 2 and on the 28S rRNA-gene demonstrated that <i>P. buri</i> is grouped with other <i>Paradeontacylix</i> species from <i>Seriola</i> spp., indicating that the enlarged tegumental spines in the posteriormost rows in the other <i>Paradeontacylix</i> spp. from <i>Seriola</i> spp. are not a morphological feature at the generic level. Another blood fluke, <i>Paradeontacylix</i> sp., is described based on a single specimen from the afferent branchial artery of yellowtail amberjack <i>S. lalandi</i> cultured in Oita Prefecture, Japan. This species may be differentiated from the most similar <i>P. buri</i> n. sp. by the cirrus (conical and thick walled in <i>Paradeontacylix</i> sp. vs. spherical and thin-walled in <i>P. buri</i>) and by the uterus (extending posteriorly up to the level of the oötype vs. extending posterior to the oötype).