Fine structure of the colonial radiolarian Collozoum serpentinum (Polycystinea: Spumellaria) with a reconsideration of its taxonomic status and re-establishment of the genus Collophidium (Haeckel)
Fine structure of the colonial radiolarian Collozoum serpentinum (Polycystinea: Spumellaria) with a reconsideration of its taxonomic status and re-establishment of the genus Collophidium (Haeckel)
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DOI：
10.1016/s0377-8398(98)00029-2
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发表时间：
1999-03-01
影响因子：
1.9
通讯作者：
Zettler, LA
中科院分区：
文献类型：
--
作者：
Anderson, OR;Gastrich, MD;Zettler, LA
精细的结构证据表明，蛇形胶粘菌与以前研究过的两个种--蛇形胶粘菌和尾状粘胶菌有很大的不同。后两者中央被膜呈椭圆形至长圆形，胞核呈圆形，胞质裂片呈放射状排列，由中央被膜中心辐射。蛇纹藻具有扭曲、拉长(大于1 mm)的圆柱形中央被膜，囊内细胞质高度空泡化，悬浮在较致密的细胞质网络中，胞内主要细胞器包括形状不规则的核、线粒体和高尔基体。这种囊内细胞质的网络结构与迄今所观察到的Collozoum物种的精细结构明显不同。这些数据与分子遗传学证据(Amaral Zettler et al，1999)相结合，表明蛇纹藻与其他Collozoum物种的亲缘关系并不像之前认为的那样密切。根据这一证据，我们认为Haeckel最初将其命名为一个单独的属(Collophidium)更适合于具有扭曲的圆柱形中央囊果的殖民地放射虫，如蛇纹藻所代表的。(C)1999 Elsevier Science B.V.保留所有权利。
Fine structural evidence shows that Collozoum serpentinum differs substantially from two previously examined species Collozoum inerme and Collozoum caudatum. The latter two have spheroidal to prolate central capsules with rounded nuclei and radially arranged lobes of cytoplasm radiating from the center of the central capsules. C. serpentinum has contorted, elongated (greater than 1 mm) cylindrical central capsules, and the intracapsular cytoplasm is highly vacuolated and suspended in a network of denser cytoplasm containing major intracellular organelles including nuclei with irregular shape, mitochondria, and Golgi bodies. This network organization of the intracapsular cytoplasm is distinctly different from the fine structure of Collozoum species examined thus far. These data, combined with molecular genetic evidence (Amaral Zettler et al,, 1999), indicate that C. serpentinum is not as closely related to other Collozoum species as was previously thought. Based on this evidence, we suggest that Haeckel's original designation of a separate genus (Collophidium) is more appropriate for colonial radiolaria with contorted, cylindrical central capsules as represented by C. serpentinum. (C) 1999 Elsevier Science B.V. All rights reserved.