Morphology, ontogeny and molecular phylogeny of a new brackish water ciliate Bakuella subtropica sp n. (Ciliophora, Hypotricha) from southern China
Morphology, ontogeny and molecular phylogeny of a new brackish water ciliate Bakuella subtropica sp n. (Ciliophora, Hypotricha) from southern China
复制标题
新的咸水纤毛虫 Bakuella subtropica sp 的形态学、个体发育和分子系统发育。
DOI：
10.1016/j.ejop.2013.05.001
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发表时间：
2013-11-01
影响因子：
2.9
通讯作者：
Miao, Miao
中科院分区：
文献类型：
--
作者：
Chen, Xumiao;Hu, Xiaozhong;Miao, Miao
本文对一种新的尾柱目纤毛虫Bakuella subtropica sp. n.的形态、个体发育和基于小亚基（SSU）rRNA基因的系统发育进行了研究，发现于中国南部广州珠江口。该新种的特征为：体长较长，有1个颊侧卷云和1个颊旁卷云，中腹复合体由9-23对中腹卷云和1 ~ 2个中腹列组成，可达体长的5分之4，皮层颗粒黄褐色至黄绿色，栖息于河口。其主要的个体发育特征是：（1）在前体中，亲代口前区膜被新的结构完全更新，旧的中腹对加入形成额-中腹-横嵴原基（2）在后口部，口原基起源于远动区，并有远动区原基形成，同时有中腹侧古老的纤毛加入;（3）边缘行和背侧运动原基在运动体内发育;（4）许多大核结节在分裂前融合成一个团块。基于SSU rDNA序列的系统发育分析表明，Bakuella subtropica sp. n. Apobakuella和Neobakuella，形成一个分支，与Bakuellidae的其他属分开。现有的形态学和个体发生学数据挑战了Bakuellidae的单系性。(C)2013 Elsevier GmbH. All rights reserved.
This paper investigates the morphology, ontogenesis and small subunit (SSU) rRNA gene-based phylogeny of a new urostylid ciliate, Bakuella subtropica sp. n., discovered from the estuary of the Pearl River in Guangzhou, southern China. The new species is diagnosed by its elongate body, one buccal and one parabuccal cirrus, midventral complex comprised of 9-23 midventral pairs and one or two midventral rows extending to four fifths of body length, yellow-brown to yellow-greenish cortical granules and an estuary habitat. Its main ontogenetic features are: (1) in the proter, the parental adoral zone of membranelles is completely renewed by new structures and old midventral pairs join the formation of frontal-midventral-transverse cirral anlagen (FVT-anlagen); (2) in the opisthe, the oral primordium originates apokinetally, FVT-anlagen are formed besides and some old midventral cirri join the formation; (3) the anlagen for marginal rows and dorsal kineties develop intrakinetally; and (4) the numerous macronuclear nodules fuse into a single mass before dividing. Based on the SSU rDNA sequences, phylogenetic analyses show a close relationship between Bakuella subtropica sp. n., Apobakuella and Neobakuella, forming a clade separated from the other genera in the family Bakuellidae. Available morphological and ontogenetic data challenge the monophyly of Bakuellidae. (C) 2013 Elsevier GmbH. All rights reserved.