ABSTRACT The genus Xenostrobus consists of small, marine and estuarine mussels that all appear similar externally. One of its estuarine species, Xenostrobus securis, with a native range in New Zealand and Australia, has become invasive in the Northern Hemisphere. No genetic data are available to determine if X. securis populations from the two countries are conspecific. Additionally, marine Xenostrobus from New Zealand have often been regarded as a species, X. neozelanicus, distinct fromthe marine Australian species X. pulex. We combined new DNA sequences with published data to assess the taxonomic status of New Zealand Xenostrobus. The data comprised 658 aligned bases of mitochondrial cytochrome c oxidase subunit I (COI) gene and 331 bases of nuclear histone H3. There was no evidence that X. securis populations from Australia and New Zealand are specifically distinct. Northern Hemisphere specimens of X. securis belonged to Australian, not New Zealand, clades in phylogenetic analyses of COI data, suggesting the former country as their more likely original source. The results confirm that X. neozelanicus and X. pulex are distinct species and for nomenclatural completeness for this taxonomic decision a lectotype is designated for Mytilus ater Zelebor in Dunker and Zelebor, 1866 [ = Modiolus neozelanicus Iredale, 1915].

中文翻译：

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1967 年对 Xenostrobus Wilson 属新西兰贻贝分类状态的遗传评估

摘要 Xenostrobus 属由小型、海洋和河口贻贝组成，它们的外观都相似。它的河口物种之一，Xenostrobus securis，原产于新西兰和澳大利亚，已成为北半球的入侵物种。没有可用的遗传数据来确定来自这两个国家的 X. securis 种群是否是同种的。此外，来自新西兰的海洋 Xenostrobus 通常被视为一个物种 X. neozelanicus，与澳大利亚海洋物种 X. pulex 不同。我们将新的 DNA 序列与已发表的数据相结合，以评估新西兰 Xenostrobus 的分类地位。数据包括线粒体细胞色素 c 氧化酶亚基 I (COI) 基因的 658 个对齐碱基和核组蛋白 H3 的 331 个碱基。没有证据表明 X. 来自澳大利亚和新西兰的 securis 种群特别不同。X. securis 的北半球标本在 COI 数据的系统发育分析中属于澳大利亚，而不是新西兰，这表明前国家更有可能是它们的原始来源。结果证实 X. neozelanicus 和 X. pulex 是不同的物种，并且为了该分类决定的命名完整性，在 Dunker 和 Zelebor，1866 年 [= Modiolus neozelanicus Iredale，1915]，为 Mytilus ater Zelebor 指定了选型。