Cox Eileen J, Van de Vijver Bart
The Natural History Museum, London, UK.
Meise Botanic Garden, Research Department, Meise, Belgium.
J Phycol. 2024 Dec;60(6):1498-1513. doi: 10.1111/jpy.13522. Epub 2024 Nov 17.
Scanning electron microscopy has revealed variation in the ultrastructure of distinctive isolated pores in or near the central area of raphid diatoms, with different types of pores being restricted to phylogenetic groups. Thus, the widespread use of the term stigma for all such pores not only hides the structural diversity but also obscures the phylogenetic distribution of the different types. This paper provides images of the different types of isolated pores, particularly refining the discrimination of variants within the Cymbellales, and reveals some interesting ecological patterns. Revised definitions of stigmata and stigmoids are proposed, together with the recognition and definition of another type of stigmoid. The restricted distribution of more precisely defined pore types shows the importance of consistent use of terminology and its relevance to phylogenetic studies.
扫描电子显微镜揭示了针杆藻中央区域或其附近独特孤立小孔超微结构的变化，不同类型的小孔局限于不同的系统发育类群。因此，将所有此类小孔统称为“眼点”不仅掩盖了结构多样性，还模糊了不同类型小孔的系统发育分布。本文提供了不同类型孤立小孔的图像，特别是细化了对 Cymbellales 目内不同变体的区分，并揭示了一些有趣的生态模式。提出了眼点和拟眼点的修订定义，以及另一种拟眼点类型的识别和定义。更精确界定的小孔类型的有限分布表明了术语一致使用的重要性及其与系统发育研究的相关性。
