Taxonomy and phylogeny of Chaetoceros species of the section Stenocincta (Bacillariophyceae), with emendation of C. affinis and C. willei and description of three new species

IF 1.5 4区 生物学 Q3 MARINE & FRESHWATER BIOLOGY
Xudan Lu, Zuoyi Chen, David U. Hernández-Becerril, Nina Lundholm, Yang Li
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引用次数: 0

Abstract

ABSTRACTSpecies of Chaetoceros sect. Stenocincta are frequently observed in marine phytoplankton. To study species diversity within the section Stenocincta, monoclonal strains were established from Chinese coastal waters and Norwegian Sea. Following detailed morphological observations and molecular evidence inferred from nucleus-encoded large subunit ribosomal DNA, the descriptions of C. affinis and C. willei are emended based on isolates from their respective type localities. Additionally, three new species are described. Chaetoceros donghaiensis sp. nov. is characterized by short straight chains, with thin setae only, and terminal setae that tend to cross distally. Chaetoceros forceps sp. nov. is unique by its thick terminal setae, each with an inflation near the end, with each pair forming a V-shape, resembling forceps. Chaetoceros lepidus sp. nov. is characterized by short, straight chains, narrowly elliptical valve faces, setae all located in the apical plane, and arched intercalary setae in opposite directions to the chain axis in broad girdle views. Three other distinct clades, which may also represent new species, were discerned in the LSU rDNA phylogeny, but more morphological characters are needed before formal proposals can be made. These species/clades formed a well-supported monophyletic lineage, supporting the current circumscription of section Stenocincta. This section is characterized by colonies in straight chains, cells with one chloroplast only, narrow lanceolate apertures, and terminal setae generally thicker than intercalary ones or both similar and thin. However, in C. diversus the terminal setae are thin and distinctly thicker pairs of intercalary setae are usual.KEYWORDS: MorphologyLSU rDNAChaetoceros affinisChaetoceros willeiChaetoceros donghaiensisChaetoceros forcepsChaetoceros lepidus DISCLOSURE STATEMENTNo potential conflict of interest was reported by the authors.Additional informationFundingThis work was supported by the National Nature Science Foundation of China [32170206]; Joint Fund of National Science Foundation of China and Chinese Shandong Province [U2106205]; National Key Research and Development Program of China [2022YFC3105201].
狭尾纲(硅藻科)毛纲的分类学和系统发育,附对C. affinis和C. willei的增补和3个新种的描述
摘要:在海洋浮游植物中,经常观察到毛囊纲的种类。为了研究Stenocincta剖面的物种多样性,从中国沿海水域和挪威海建立了单克隆菌株。根据详细的形态学观察和从核编码的大亚基核糖体DNA推断的分子证据,根据各自类型地区的分离株,对C. affinis和C. willei的描述进行了修订。此外,还发现了3个新种。东海毛羽的特征是短而直的链,只有薄的刚毛,顶生刚毛倾向于上部交叉。Chaetoceros forceps sp. 11 .的独特之处在于其厚实的末端刚毛,每对刚毛在末端附近都有一个膨胀,每对形成一个v形,类似于钳子。鳞翅目毛羽的特征是:短而直的链,窄椭圆形的瓣面,所有的刚毛都位于顶端平面,在宽的束状视图中,与链轴相反方向的拱状刚毛。在LSU rDNA系统发育中发现了另外三个不同的分支,它们也可能代表新物种,但在提出正式建议之前,需要更多的形态学特征。这些种/枝形成了一个得到很好支持的单系谱系,支持了目前狭生科的界限。这部分的特征是直链的菌落,只有一个叶绿体的细胞,狭窄的披针形孔,顶生刚毛通常比隔层刚毛厚,或者既相似又薄。然而,在C. diversus中,顶生刚毛很薄,通常有明显较厚的对花萼间刚毛。关键词:形态学;苏氏;dna;亲和;基金资助:国家自然科学基金[32170206];国家自然科学基金与山东省联合基金[U2106205];国家重点研发计划[2022YFC3105201]。
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来源期刊
Phycologia
Phycologia 生物-海洋与淡水生物学
CiteScore
3.10
自引率
18.80%
发文量
54
审稿时长
3 months
期刊介绍: Phycologia is published bimonthly by the International Phycological Society and serves as a publishing medium for information about any aspect of phycology. Membership in the Society is not necessary for publication. Submitted manuscripts cannot be previously published or submitted elsewhere. Copyright ownership of all accepted papers is held by the International Phycological Society.
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