Department of Zoology, University of Oxford, South Parks Road, Oxford, OX1 3PS, UK.
Protist. 2011 Nov;162(5):710-22. doi: 10.1016/j.protis.2011.06.002. Epub 2011 Jul 23.
Glissomonadida is an important cercozoan order of predominantly biflagellate gliding bacterivores found largely in soil and freshwater. Their vast diversity is largely undescribed. We studied 23 mostly newly isolated strains by light microscopy and sequenced their 18S rDNA genes; nine represent new species. For two misidentified ATCC 'Heteromita triangularis' strains, we establish novel gliding genera and species: the sandonid Mollimonas lacrima, the only glissomonad forming anterior and posterior pseudopodia, and Dujardina stenomorpha, a strongly flattened member of the new family Dujardinidae. A new strain from Oxfordshire grassland soil is the first reliably identified isolate of the virtually uniflagellate, smooth-gliding glissomonad genus, AllantionSandon, 1924. Phylogenetic analysis and cytological features reveal Allantion to be a member of Allapsidae. Sandona limna and Bodomorpha prolixa from Lake Baikal and Sandona hexamutans from volcanic Costa Rican soil are described as new species. Fifteen glissomonad strains were from grassland beside Lake Baikal. We describe two as new species of Sandona (S. heptamutans and S. octamutans); the others included strains of Sandona and Allapsa species that have already been described; and three were new species of Sandona and Allapsa but these died before being described. We discuss the ecological and evolutionary significance of these new strains.
滑行滴虫目是一类重要的原生动物，主要以土壤和淡水中的双鞭毛滑行细菌为食。它们的多样性很大程度上尚未被描述。我们通过光学显微镜研究了 23 株主要的新分离株，并对它们的 18S rDNA 基因进行了测序；其中 9 株代表新种。对于两个被错误鉴定的 ATCC“ Heteromita triangularis”菌株，我们建立了新的滑行属和种：具有前伪足和后伪足的唯一滑行滴虫 Mollimonas lacrima，以及具有强烈扁平形态的新科 Dujardinidae 的 Dujardina stenomorpha。来自牛津郡草地土壤的新菌株是第一个可信赖地鉴定为具有单一鞭毛、光滑滑行的 glissomonad 属 Allantion 的分离株，该属由 Sandon 于 1924 年建立。系统发育分析和细胞学特征表明，Allantion 是 Allapsidae 的一个成员。来自贝加尔湖的 Sandona limna 和 Bodomorpha prolixa 以及来自哥斯达黎加火山土壤的 Sandona hexamutans 被描述为新种。来自贝加尔湖草原的 15 株滑行滴虫。我们描述了 2 个新种的 Sandona（S. heptamutans 和 S. octamutans）；其余包括已经描述过的 Sandona 和 Allapsa 种的菌株；还有三个是新种的 Sandona 和 Allapsa，但这些种在描述之前就已经死亡。我们讨论了这些新菌株的生态和进化意义。
