Pellicle ultrastructure demonstrates that Moyeria is a fossil euglenid
Pellicle ultrastructure demonstrates that Moyeria is a fossil euglenid
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薄膜超微结构表明 Moyeria 是眼虫化石
DOI：
10.1080/01916122.2019.1625457
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发表时间：
2019
期刊：
影响因子：
1.5
通讯作者：
Strother P
中科院分区：
文献类型：
--
作者：
Strother P
早期关于裸藻科与疑源类Moyeria亲缘关系的假设主要是基于扫描电子显微镜和光学显微镜观察到的双螺旋条纹排列模式。使用透射电子显微镜检查标本显示，“条纹”实际上是微体化石壁本身的组成部分，相当于今天一些裸藻物种的表膜带。一个来自苏格兰的志留纪标本保存了一个由加厚的拱门和较薄的U形相互连接的部分组成的关节壁，这些部分平行于一些现代光合作用的裸藻。第二个来自Moyeriaholotype部分（志留纪的纽约州）的标本显示融合关节，再次与一些现存的裸藻相一致。这一证据足以将Moyeria从Incertae sedisgroup，Acritarcha转移到Euglenida。这一建议有助于建立识别眼虫微体化石的形态学基础，并最终提供了真核生物超群掘孔虫的漫长化石记录的证据。
An earlier proposal of euglenid affinity for the acritarchMoyeriawas based primarily on the pattern of bi-helical striate ornamentation as seen in scanning electron microscopy and light microscopy. Examination of specimens using transmission electron microscopy reveals that the ‘striae’ are actually integral components of the microfossil wall itself, corresponding to the pellicle strips of some euglenid species today. A Silurian specimen from Scotland preserves an articulated wall composed of thickened arches and thinner U-shaped interconnecting segments paralleling that seen in some modern photosynthetic euglenids. A second specimen from theMoyeriaholotype section (Silurian of New York State) shows fused articulation, again compatible with some extant euglenids. This evidence is sufficient to transferMoyeriaout of theIncertae sedisgroup, Acritarcha, and into the Euglenida. This proposal helps establish the morphological basis for the recognition of euglenid microfossils and ultimately provides evidence of a lengthy fossil record of the eukaryotic supergroup Excavata.