Comparative Morphology of the Euglenid Pellicle. II. Diversity of Strip Substructure
Comparative Morphology of the Euglenid Pellicle. II. Diversity of Strip Substructure
复制标题
眼虫皮膜的比较形态学。
DOI：
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发表时间：
2001
影响因子：
2.2
通讯作者：
M. A. Farmer
中科院分区：
文献类型：
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作者：
B. Leander;M. A. Farmer
抽象的。检查了与眼虫表膜条状亚结构相关的形态多样性，并在识别特征和状态后，我们概述了有关其进化的假设。我们试图通过提供术语表和比较已发布的同义词来标准化条带分析比较所需的术语。眼虫中发现的大部分亚结构多样性通过 13 个代表性类群得到证实。条带通常由两个子组件组成：框架和投影。框架支持条带的基本形状，许多框架可以描述为 S 形、高原形、M 形或 A 形。从框架横向分支的突出物通常是周期性的，可以描述为线状结构、锯齿板、齿状结构和板状结构。原始状态包括数量少、平坦且融合的条带。这些条带变成了 S 形，并且在导致大多数眼虫类群的谱系中脱节。这些条带二次变平并融合成一个谱系。在一些光养生物谱系中，这些条带变得越来越坚固。两条不同形态的条带在四个类群中形成重复的薄膜单元或双联体。这些双联体至少进化了三次，可以为细胞骨架的发育模式提供见解。
ABSTRACT. The morphological diversity associated with the strip substructure of the euglenid pellicle was examined, and after identifying characters and states, we outlined hypotheses about their evolution. We have attempted to standardize terms necessary for analytical comparisons of strips by providing a glossary and comparing published synonyms. Most of the substructural diversity found in euglenids is demonstrated with 13 representative taxa. Strips are generally composed of two subcomponents: frames and projections. Frames support the basic shape of strips and many can be described as either S‐shaped, plateau‐shaped, M‐shaped, or A‐shaped. Projections branch laterally from the frames, are usually periodic, and can be described as thread‐like structures, an indented plate, tooth‐like structures, and plate‐like structures. The ancestral state included strips that were few in number, flat, and fused. The strips became S‐shaped and disjoined in the lineage leading to most euglenid taxa. These strips became secondarily flattened and fused in one lineage. In some lineages of phototrophs, the strips became increasingly robust. Two strips of different morphology formed the repeating pellicular unit or doublet in four taxa. These doublets evolved convergently at least three times and may provide insights into developmental patterns of the cytoskeleton.