Freshwater protists often harbor unicellular green algae within their cells. In ciliates, possibly because of large host cell sizes and the small size of algal coccoids, a single host cell typically contains more than a hundred algal cells. While surveying such algae-bearing protists on Minami Daito Jima Island in Japan, we found a green Loxodes ciliate (Loxodida, Karyorelictea) that contained one or two dozens of very large coccoid algae. We isolated one of these algae and analyzed its characteristics in detail. A small subunit (SSU) rDNA phylogeny indicated Pseudodidymocystis species (Scenedesmaceae, Chlorophyceae) to be the taxon closest to the alga, although it was clearly separated from this by 39 or more different sites (inclusive of gaps). SSU rRNA structure analyses indicated that these displacements included eight compensatory base changes (CBCs) and seven hemi-CBCs. We therefore concluded that this alga belongs to a separate genus, and described it as Pediludiella daitoensis gen. et sp. nov. The shape of the isolated and cultured P. daitoensis was nearly spherical and reached up to 30 µm in diameter. Chloroplasts were arranged peripherally and often split and elongated. Cells were often vacuolated and possessed a net-like cytoplasm that resembled a football (soccer ball) in appearance, which was reflected in the genus name.

中文翻译：

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大同小叶蕨 等。十一月 （Scenedesmaceae，Chlorophyceae），一种大型球状绿藻，从纤毛的Loxodes纤毛虫中分离出来。

淡水生物经常在其细胞内藏有单细胞绿藻。在纤毛虫中，可能是由于宿主细胞大而藻类球菌体小所致，单个宿主细胞通常包含一百多个藻类细胞。在对日本南大本岛岛的此类含藻生物进行调查时，我们发现了一个绿色的纤毛鸢尾（Loxodida，Karyorelictea），其中包含一两个数十个非常大的球状藻类。我们分离了其中一种藻类，并详细分析了其特征。一个小的亚基（SSU）rDNA系统发育表明，假双囊藻属物种（Scenedesmaceae，Chlorophyceae）是最靠近藻类的分类单元，尽管显然它被39个或更多不同的位点（包括缺口）隔开。SSU rRNA结构分析表明，这些位移包括八个补偿性碱基变化（CBC）和七个半CBC。因此，我们得出的结论是，该藻类属于一个单独的属，并将其描述为大黄檀（Pediludiella daitoensis）属。等。十一月 分离和培养的P. daitoensis的形状接近球形，直径可达30 µm。叶绿体排列在外围，经常分裂和拉长。细胞经常被空泡化，并拥有类似于橄榄球（足球）的网状细胞质，这反映在属名中。daitoensis接近球形，直径可达30 µm。叶绿体排列在外围，经常分裂和拉长。细胞经常被空泡化，并具有类似于橄榄球（足球）的网状细胞质，这反映在属名中。daitoensis接近球形，直径可达30 µm。叶绿体排列在外围，经常分裂和拉长。细胞经常被空泡化，并拥有类似于橄榄球（足球）的网状细胞质，这反映在属名中。