Shao Chen, Song Weibo, Hu Xiaozhong, Ma Honggang, Zhu Mingzhuang, Wang Mei
Laboratory of Protozoology, KLM, Ocean University of China, Qingdao, PR China.
Eur J Protistol. 2006 Mar;42(1):9-19. doi: 10.1016/j.ejop.2005.09.002. Epub 2005 Nov 8.
The morphology and morphogenesis of the large marine heterotrichous ciliate, Condylostoma spatiosum Ozaki & Yagiu in Yagiu, 1944, isolated from Jiaozhou Bay off Qingdao (Tsingtao), China, were investigated using live observation and protargol impregnation. A detailed redescription is given since no infraciliature data about this "well-studied" species are available. It is characterized by: size in vivo 400-700 x 90-140 microm; buccal field about 1/3 of body length; adoral zone composed of 130 membranelles on average; invariably two prominent membrane-like frontal cirri, which are parallel to each other; about 58 somatic kineties; macronucleus composed of 13-22 fragments. Morphogenesis proceeds basically as described in a previous report and can be summarized as follows: (1) the parental adoral zone of membranelles is partly dedifferentiated and then renewed in the posterior portion; (2) in the proter, both the frontal cirri and the paroral membrane are newly formed by anlagen derived from the disaggregated old structures; (3) in the opisthe the anlagen of the paroral membrane and the frontal cirri develop from the right margin of the oral primordium; (4) two frontal cirri are formed one after the other by the frontal cirral anlage; (5) during morphogenesis, no recognizable duplication of basal bodies takes place in somatic kineties; and (6) the macronucleus divides after prior fusion. One reorganizer was observed showing that the basic process of reorganization is obviously similar to that in division.
对采自中国青岛附近胶州湾的大型海洋异毛类纤毛虫——1944年由尾木和矢追描述的宽敞髭纤虫（Condylostoma spatiosum Ozaki & Yagiu）进行了活体观察和蛋白银染色，研究其形态学和形态发生过程。鉴于尚无关于这个“已充分研究”物种的纤毛下纤毛器数据，因此给出了详细的重新描述。其特征如下：活体大小为400 - 700×90 - 140微米；口区约为体长的1/3；口围带平均由130片小膜组成；始终有两条突出的膜状额棘毛，彼此平行；约有58列体纤毛；大核由13 - 22个片段组成。形态发生过程基本如先前报道所述，可总结如下：(1)亲代口围带小膜部分去分化，然后在后部更新；(2)在前仔虫中，额棘毛和口侧膜均由源自解体旧结构的原基重新形成；(3)在后仔虫中，口侧膜和额棘毛的原基从口原基的右缘发育而来；(4)额棘毛原基先后形成两条额棘毛；(5)在形态发生过程中，体纤毛列中未观察到基体的明显复制；(6)大核在先前融合后分裂。观察到一个重组子，表明重组的基本过程与分裂过程明显相似。
