The current study focuses on four species from the primarily marine diatom genus Craspedostauros that were observed growing attached to numerous sea turtles and sea turtle‐associated barnacles from Croatia and South Africa. Three of the examined taxa, C. danayanus sp. nov., C. legouvelloanus sp. nov., and C. macewanii sp. nov., are described based on morphological and, whenever possible, molecular characteristics. The new taxa exhibit characters not previously observed in other members of the genus, such as the presence of more than two rows of cribrate areolae on the girdle bands, shallow perforated septa, and a complete reduction of the stauros. The fourth species, C. alatus, itself recently described from museum sea turtle specimens, is reported for the first time from loggerhead sea turtles rescued in Europe. A 3‐gene phylogenetic analysis including DNA sequence data for three sea turtle‐associated Craspedostauros species and other marine and epizoic diatom taxa indicated that Craspedostauros is monophyletic and sister to Achnanthes. This study, being based on a large number of samples and animal specimens analyzed and using different preservation and processing methods, provides new insights into the ecology and biogeography of the genus and sheds light on the level of intimacy and permanency in the host–epibiont interaction within the epizoic Craspedostauros species.

中文翻译：

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与海龟相关的Craspedostauros（Bacillariophyta），并描述了三种新物种

目前的研究集中在主要来自海洋硅藻属Craspedostauros的四个物种上，发现它们生长在克罗地亚和南非的众多海龟和与海龟相关的藤壶上。检查的三个分类单元中，C。danayanus sp.。十一月，C. legouvelloanus sp。十一月和C. macewanii sp。nov。，是根据形态学和分子特性（如有可能）进行描述的。新的分类群表现出以前在该属的其他成员中未观察到的特征，例如在腰带上存在超过两行的盘状乳晕，浅穿孔的隔片和stauros的完全减少。第四种，C。alatus最初是从博物馆的海龟标本中描述的，最初是在欧洲救出的海龟中首次报道的。对包括3种海龟相关的Craspedostauros物种以及其他海洋和流行的硅藻类群的DNA序列数据进行了3基因系统发育分析，表明Craspedostauros是单亲的，是Achnanthes的姐妹。这项研究基于大量样品和动物标本，并使用不同的保存和加工方法，为该属的生态和生物地理学提供了新见解，并阐明了宿主与表皮动物之间的亲密关系和永久性水平。在流行的Craspedostauros物种中。