Morphological and molecular characterization of a new protist family, Sandmanniellidae n. fam. (Ciliophora, Colpodea), with description of Sandmanniella terricola n. g., n. sp. from the Chobe floodplain in Botswana.
Morphological and molecular characterization of a new protist family, Sandmanniellidae n. fam. (Ciliophora, Colpodea), with description of Sandmanniella terricola n. g., n. sp. from the Chobe floodplain in Botswana.
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DOI：
10.1111/j.1550-7408.2009.00429.x
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发表时间：
2009-09
期刊：
影响因子：
--
通讯作者：
Stoeck T
中科院分区：
文献类型：
--
作者：
Foissner W;Stoeck T
桑德曼氏菌(Sandmanniella Terricola)n.g，n.sp.是在南部非洲博茨瓦纳乔贝泛滥平原的土壤中发现的。用标准方法对其形态和18S rDNA基因序列进行了研究。土生沙门氏菌很可能是一种逆境战略家，因为它在土壤重新润湿6-12小时后达到峰值，并在休眠的包囊中保持营养丰富的食物空泡和未消化的细菌，这一高度特异的特征被认为是逆境生活策略的指示器。储存的食物液泡的能量可能被用来繁殖和支持囊壁。形态上不明显，大小仅为50×40μm，形状简单，呈椭圆形。该属的主要特征是有一根银线纹；口周纤毛凝聚；扁平的盘状口腔，在其中央起源一个长的圆锥形口篮，类似于某些Nassulid纤毛虫的口篮；以及垂直定向的由砖状腺细胞器组成的左口多囊。这种独特的特征和基因序列树，其中沙门氏菌显示了一个孤立的位置，建议建立一个新的科，沙门氏菌科n.fam.，可能与Colpodidae或Bryophryidae科有关。这个奇怪的口篮为甲虫和甲虫纤毛虫的共同祖先的假说提供了一些支持。
Sandmanniella terricola n. g., n. sp. was discovered in soil from the Chobe floodplain, Botswana, southern Africa. Its morphology and 18S rDNA gene sequence were studied with standard methods. Sandmanniella terricola is very likely an adversity strategist because it reaches peak abundances 6–12 h after rewetting the soil and maintains trophic food vacuoles with undigested bacteria in the resting cyst, a highly specific feature suggested as an indicator for an adversity life strategy. Possibly, the energy of the stored food vacuoles is used for reproduction and support of the cyst wall. Morphologically, Sandmanniella terricola is inconspicuous, having a size of only 50 × 40 μm and a simple, ellipsoidal shape. The main characteristics of the genus are a colpodid silverline pattern; a perioral cilia condensation; a flat, dish-shaped oral cavity, in the centre of which originates a long, conical oral basket resembling that of certain nassulid ciliates; and a vertically oriented left oral polykinetid composed of brick-shaped adoral organelles. This unique mixture of features and the gene sequence trees, where Sandmanniella shows an isolated position, suggest establishing a new family, the Sandmanniellidae n. fam., possibly related to the families Colpodidae or Bryophryidae. The curious oral basket provides some support for the hypothesis of a common ancestor of colpodid and nassulid ciliates.
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DOI：
10.1111/j.1550-7408.2008.00307.x
发表时间：
2008-03
期刊：
The Journal of eukaryotic microbiology
影响因子：
--
作者：
Breiner HW;Foissner W;Stoeck T
通讯作者：
Stoeck T
影响因子：
5.8
作者：
Posada, D;Crandall, KA
通讯作者：
Crandall, KA
影响因子：
14.9
作者：
Thompson, JD;Gibson, TJ;Higgins, DG
通讯作者：
Higgins, DG
影响因子：
3.4
作者：
Foissner, Wilhelm;Chao, Anne;Katz, Laura A.
通讯作者：
Katz, Laura A.
影响因子：
2.9
作者：
HOFMANNMUNZ, AH
通讯作者：
HOFMANNMUNZ, AH