Repullés-Albelda Aigües, Montero Francisco E, Holzer Astrid S, Ogawa Kazuo, Hutson Kate S, Raga Juan A
Cavanilles Institute of Biodiversity and Evolutionary Biology, University of Valencia, PO Box 22085, Valencia, Spain.
Parasitol Int. 2008 Sep;57(3):405-14. doi: 10.1016/j.parint.2008.04.011. Epub 2008 Apr 25.
Two new species of teleost blood fluke belonging to the sanguinicolid genus Paradeontacylix are described from the greater amberjack, Seriola dumerili, i.e. Paradeontacylix ibericus n. sp. from the Iberian Peninsula and Paradeontacylix balearicus n. sp. from the Balearic Islands. P. ibericus n. sp. and P. balearicus n. sp. show morphological similarities with Paradeontacylix kampachi and Paradeontacylix grandispinus respectively, which occur in mixed infection in S. dumerili from Japan. Multivariate analysis of morphometrical data provided statistical evidence for the separation of four species. However, component by component analysis did not show statistically significant differences between P. balearicus and P. grandispinus. Molecular data based on rITS2 and mCO1 gene sequences also supported the separation into four species. Morphological and molecular data were used to examine phylogenetic relationships between Paradeontacylix species from S. dumerili and other species in the genus. The results coincided in revealing two main branches with P. kampachi+P. ibericus and (((P. grandispinus+P. balearicus) Paradeontacylix sanguinicoloides) Paradeontacylix godfreyi). Paradeontacylix odhneri, for which little data are available, was located basal in a separate branch. This is the only species of Paradeontacylix which parasitizes a non-carangid host which might probably explain the separation from the other species. Paired similarities between the Japanese and the Mediterranean species, despite the large geographic distance, could be explained by the speciation of parasite geminate lines before host separation by tectonic events. Consequently, geographic and historical isolation support the morphological and genetic differences leading to the evolution of the new species described here.
从杜氏鰤（Seriola dumerili）中描述了两种属于血吸虫科Paradeontacylix属的硬骨鱼血吸虫新物种，即来自伊比利亚半岛的伊比利亚Paradeontacylix ibericus新种和来自巴利阿里群岛的巴利阿里Paradeontacylix balearicus新种。伊比利亚Paradeontacylix ibericus新种和巴利阿里Paradeontacylix balearicus新种分别与来自日本杜氏鰤混合感染中的kampachi Paradeontacylix和大棘Paradeontacylix grandispinus形态相似。形态测量数据的多变量分析为这四个物种的区分提供了统计证据。然而，逐个成分分析并未显示巴利阿里Paradeontacylix和大棘Paradeontacylix之间存在统计学上的显著差异。基于rITS2和mCO1基因序列的分子数据也支持分为四个物种。形态学和分子数据用于研究来自杜氏鰤的Paradeontacylix物种与该属其他物种之间的系统发育关系。结果一致显示出两个主要分支，分别是kampachi Paradeontacylix +伊比利亚Paradeontacylix和（（（大棘Paradeontacylix +巴利阿里Paradeontacylix）Paradeontacylix sanguinicoloides）Paradeontacylix godfreyi）。关于odhneri Paradeontacylix的数据很少，它位于一个单独分支的基部。这是Paradeontacylix属中唯一寄生于非鲹科宿主的物种，这可能解释了它与其他物种的分离。尽管地理距离很远，但日本和地中海物种之间的成对相似性可以通过宿主在构造事件中分离之前寄生虫双生系的物种形成来解释。因此，地理和历史隔离支持了形态和遗传差异，导致了这里描述的新物种的进化。
