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首页> 外文期刊>Zoologica Scripta: An International Journal of Evolutionary Zoology >The diet and distribution of Pentacoelum kazukolinda (Kawakatsu & Mitchell, 1984), a maricolan planarian with a freshwater ecology
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The diet and distribution of Pentacoelum kazukolinda (Kawakatsu & Mitchell, 1984), a maricolan planarian with a freshwater ecology

机译：淡水生态学的马科蓝涡虫Pentacoelum kazukolinda（Kawakatsu＆Mitchell，1984）的饮食和分布

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摘要

Among the marine triclads or Maricola, the genus Pentacoelum represents one of the few exceptions in that species occur in brackish water or in freshwater. We examined specimens of a maricolan triclad that externally looked remarkably similar to the continental Spanish representatives of freshwater Pentacoelum hispaniense, albeit that these new samples came from habitats in Germany, the Netherlands, Mallorca and Japan. Comprehensive comparative morphological studies revealed that the animals from these populations are identical to a species described earlier from Hawaii, viz. Oahuhawaiiana kazukolinda Kawakatsu & Mitchell, 1984. It is argued that the species now should be called Pentacoelum kazukolinda (Kawakatsu & Mitchell, 1984) comb. nov. Remarkably, Dutch and German specimens of P.kazukolinda almost completely lack any signs of the presence of the lateral gonopore system, being the defining feature of their taxonomic family, the Bdellouridae. The reason for this reduction or even complete absence of this structure remains obscure. Nonetheless, morphological similarities and 18S rDNA sequences strongly suggest that all animals belong to the same species. Analyses of the mitochondrial gene sequences Cox1 and 16SrDNA of the gut content of P.kazukolinda revealed that the flatworm has a preference for different species of gastropods, while in one population annelids were detected. Our study suggests that gastropods may form the food refuge of P.kazukolinda. Circumstantial evidence suggests that the worldwide distribution of P.kazukolinda may result from human-mediated transport of the aroid Colocasia esculenta and/or the introduced snail Potamopyrgus antipodarum. The use of P.antipodarum as a food resource may have facilitated the spread and establishment of new populations of P.kazukolinda.
机译：在海洋三头目或马里可拉中，五角茴香属是为数不多的几个物种之一，它们出现在微咸水或淡水中。我们检查了马里科三角龙的标本，这些标本的外表与西班牙大陆淡水五角大楼的代表非常相似，尽管这些新样本来自德国，荷兰，马洛卡和日本的生境。全面的比较形态学研究表明，这些种群的动物与夏威夷早些时候描述的物种相同，即。 Oahuhawaiiana kazukolinda Kawakatsu＆Mitchell，1984年。有人认为该物种现在应被称为Pentacoelum kazukolinda（Kawakatsu＆Mitchell，1984年）。十一月值得注意的是，荷兰和德国的P.kazukolinda标本几乎完全没有任何侧向线孔系统的迹象，这是它们的分类学家族Bdellouridae的定义特征。这种减少甚至完全不存在这种结构的原因仍然不清楚。但是，形态相似性和18S rDNA序列强烈表明所有动物都属于同一物种。对P.kazukolinda肠道含量的线粒体基因序列Cox1和16SrDNA的分析显示，扁虫对不同种类的腹足动物有偏爱，而在一个种群中发现了甲虫。我们的研究表明，腹足动物可能形成卡祖克林达的食物庇护所。间接证据表明，P.kazukolinda在世界范围内的分布可能是由人类介导的圆叶香芋和/或所引入的蜗牛波达莫氏抗足虫的运输引起的。使用对虾假单胞菌作为食物资源可能促进了对假单胞菌的新种群的传播和建立。

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