The morphology and morphogenesis of a new ciliate species, Neobakuella aenigmatica n. sp., which was discovered in an estuary in Korea, were investigated, using live observation, protargol impregnation, and scanning electron microscopy. This new species is characterized by a large (185–300 × 55–105 μm in vivo), elongate‐ellipsoidal, flexible but not contractile body. It has ellipsoidal, yellowish cortical granules, 1.3 × 1.0 μm in size. The species has invariably 3 frontal and 2 frontoterminal cirri, about 5–10 buccal and 1–6 parabuccal cirri, 7 midventral rows, and 1 right and 2–4 left marginal rows. The outer left marginal row(s) consists of 1–7 short rows of cirri. The nuclear apparatus comprises 130 macronuclear nodules and 2 spherical micronuclei on average. The dorsal ciliature consists of 3 dorsal kineties. The leftmost left marginal row(s) likely develops from anlagen originating from both the rightmost and leftmost left marginal row(s). The molecular phylogenetic tree based on SSU rDNA suggests the nonmonophyly of the genus Neobakuella.

中文翻译：

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Neobakuella aenigmatica n 的形态、形态发生和分子系统发育。sp. （纤毛纲、螺旋体纲、芽孢杆菌科）

一种新的纤毛虫物种 Neobakuella aenigmatica n 的形态学和形态发生。对在韩国河口发现的 sp. 进行了研究，使用现场观察、protargol 浸渍和扫描电子显微镜。这个新物种的特点是一个大的（体内 185-300 × 55-105 μm）、细长的椭圆体、柔韧但不收缩的身体。它有椭圆形、淡黄色的皮质颗粒，大小为 1.3 × 1.0 μm。该物种总是有 3 条额叶和 2 条额端卷毛，大约 5-10 条颊和 1-6 条颊旁卷毛，7 中腹行，以及 1 行右侧和 2-4 行左侧边缘行。外侧左边缘行由 1-7 行短行卷毛组成。核装置平均包括130个大核结节和2个球形微核。背纤毛由3个背侧动能组成。最左边的左边缘行可能是从最右边和最左边的左边缘行产生的原素发展而来的。基于 SSU rDNA 的分子系统发育树表明 Neobakuella 属的非单系性。