Institute of Biological and Environmental Sciences, University of Aberdeen, AB24 3UU, UK.
Mol Phylogenet Evol. 2010 May;55(2):738-43. doi: 10.1016/j.ympev.2010.01.026. Epub 2010 Feb 2.
Terrestrial molluscs are diverse and are infected by many nematodes. We propose a phylogeny of slug-parasitic nematodes using 18S rRNA gene sequences from nematodes isolated from slugs collected from six countries. Eight species, representing six families of nematodes were identified and trees inferred placed them within four (I, III, IV and V) out of the five clades of Nematoda, indicating multiple origins of slug parasitism. Five species representing three families formed a monophyletic group in clade V. Although these species are closely related, their morphology has changed greatly, suggesting adaptive radiation to fill different niches within the host.
陆生贝类种类繁多，受到许多线虫的感染。我们使用从六个国家采集的贝类中分离出的线虫的 18S rRNA 基因序列，提出了一种寄生在贝类上的线虫系统发育。鉴定出 8 个种，代表线虫的 6 个科，推断出的系统树将它们置于线虫的五个进化枝中的四个（I、III、IV 和 V）内，表明寄生在贝类上的线虫有多个起源。代表三个科的 5 个种在进化枝 V 中形成一个单系群。尽管这些物种密切相关，但它们的形态发生了很大的变化，这表明它们为适应宿主的不同生态位而发生了辐射适应。
