Nishikawa Teruaki, Oohara Ichiro, Saitoh Kenji, Shigenobu Yuya, Hasegawa Natsuki, Kanamori Makoto, Baba Katsuhisa, Turon Xavier, Bishop John D D
1 Faculty of Science, Toho University, 2-2-1, Miyama, Funabashi, Chiba 274-8510, Japan.
Zoolog Sci. 2014 Mar;31(3):180-5. doi: 10.2108/zsj.31.180.
The solitary ascidian Ascidiella aspersa (Müller, 1776) has sometimes been regarded as conspecific with A. scabra (Müller, 1776), although previous detailed morphological comparisons have indicated that the two are distinguishable by internal structures. Resolution of this taxonomic issue is important because A. aspersa has been known as a notoriously invasive ascidian, doing much damage to aquaculture e.g. in Hokkaido, Japan. We collected many specimens from European waters (including the Swedish coast, near the type localities of these two species) and Hokkaido, Japan (as an alien population) and made molecular phylogenetic analyses using the mitochondrial cytochrome c oxidase subunit I (COI) gene, and found that in terms of COI sequences all the analyzed specimens were clustered into two distinct groups, one of which is morphologically referable to A. aspersa and the other to A. scabra. Thus, these two species should be regarded as distinct from each other.
单体海鞘皱瘤海鞘（Ascidiella aspersa，缪勒，1776年）有时被认为与粗糙海鞘（A. scabra，缪勒，1776年）是同种，但先前详细的形态学比较表明，两者可通过内部结构区分开来。解决这个分类学问题很重要，因为皱瘤海鞘是一种臭名昭著的入侵性海鞘，对水产养殖造成了很大破坏，例如在日本北海道。我们从欧洲水域（包括这两个物种模式产地附近的瑞典海岸）和日本北海道（作为外来种群）收集了许多标本，并使用线粒体细胞色素c氧化酶亚基I（COI）基因进行了分子系统发育分析，结果发现，就COI序列而言，所有分析的标本都聚为两个不同的组，其中一组在形态上可归为皱瘤海鞘，另一组可归为粗糙海鞘。因此，这两个物种应被视为彼此不同。
