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Pellicle ultrastructure demonstrates that Moyeria is a fossil euglenid
Palynology ( IF 1.5 ) Pub Date : 2019-07-22 , DOI: 10.1080/01916122.2019.1625457
Paul K. Strother 1 , Wilson A. Taylor 2 , Bas van de Schootbrugge 3 , Brian S. Leander 4 , Charles H. Wellman 5
Affiliation  

ABSTRACT An earlier proposal of euglenid affinity for the acritarch Moyeria was 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 the Moyeria holotype section (Silurian of New York State) shows fused articulation, again compatible with some extant euglenids. This evidence is sufficient to transfer Moyeria out of the Incertae sedis group, 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.

中文翻译:

Pellicle 超微结构表明 Moyeria 是一种化石眼线虫

摘要 早期关于眼虫对 acritarch Moyeria 亲和性的提议主要基于扫描电子显微镜和光学显微镜中所见的双螺旋条纹装饰图案。使用透射电子显微镜检查标本表明,“条纹”实际上是微化石壁本身的组成部分,对应于今天一些眼线虫物种的薄膜条。来自苏格兰的志留纪标本保留了由加厚的拱门和较薄的 U 形互连部分组成的铰接墙,这些部分在一些现代光合眼虫中可见。来自 Moyeria 正模部分(纽约州志留纪)的第二个标本显示融合的关节,再次与一些现存的眼线虫兼容。这一证据足以将 Moyeria 从 Incertae sedis 组 Acritarcha 转移到 Euglenida 中。该提议有助于建立识别真核生物微化石的形态学基础,并最终为真核超群 Excavata 的长期化石记录提供证据。
更新日期:2019-07-22
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