da Silva Paiva Thiago, Küppers Gabriela Cristina, Lahr Daniel José Galafasse, Schweikert Michael, da Silva-Neto Inácio Domingos
Laboratory of Evolutionary Protistology, Instituto de Biociências, Universidade de São Paulo, São Paulo, SP, Brazil; Laboratório de Biologia Molecular "Francisco Mauro Salzano", Instituto de Ciências Biológicas, Universidade Federal do Pará, Belém, PA, Brazil.
División Invertebrados, Museo Argentino de Ciencias Naturales "Bernardino Rivadavia", Buenos Aires, Argentina.
Eur J Protistol. 2017 Apr;58:103-134. doi: 10.1016/j.ejop.2017.01.002. Epub 2017 Jan 19.
Odontostomatids are among the less studied representatives of the Ciliophora. They are anaerobic microeukaryotes usually occurring as rare species in sapropelic environments. Here we describe a novel species of Discomorphella, named Discomorphella pedroeneasi sp. nov., using light and electron microscopy observations. Discomorphella pedroeneasi displays many complex morphological features, for which new terms are introduced, such as the auricules, epistomial fringe spacer, frontal awning, odontostomatid ciliary sockets, oral lips and ventral flap. Remarkably, D. pedroeneasi has at least six types of endocytobionts, including intramacronuclear ones, and organelles ultrastructurally similar to the M/H bodies of the odontostomatid Saprodinium dentatum. Based on the new data and revision of the literature, we propose two new diagnostic characters for species separation within Discomorphella: the fringe spacer ratio and the posterior fringe ratio. The taxonomy of Discomorphella is revised and an identification key is provided.
齿口目动物是纤毛虫门中研究较少的代表物种。它们是厌氧的微真核生物，通常作为稀有物种出现在腐泥环境中。在此，我们利用光学显微镜和电子显微镜观察结果，描述了一种新的盘形虫属物种，命名为佩德罗内斯盘形虫（Discomorphella pedroeneasi sp. nov.）。佩德罗内斯盘形虫呈现出许多复杂的形态特征，为此引入了一些新术语，如耳状突、口前膜边缘间隔、额篷、齿口目纤毛窝、口唇和腹侧瓣。值得注意的是，佩德罗内斯盘形虫至少有六种内共生体类型，包括大核内的内共生体，以及在超微结构上与齿口目动物齿状腐生虫（Saprodinium dentatum）的M/H体相似的细胞器。基于新的数据和文献修订，我们提出了两个用于盘形虫属内物种区分的新诊断特征：边缘间隔比和后缘比。对盘形虫属的分类进行了修订，并提供了一个鉴定检索表。
