复杂Warnowiceae(Dinophyceae)的研究I.Lohmann的Pouchetia parva重新命名并更名为Nematodinium parvum comb。十一月

IF 1.5 4区 生物学 Q3 MARINE & FRESHWATER BIOLOGY Phycologia Pub Date : 2023-09-08 DOI:10.1080/00318884.2023.2244810
María García-Portela, Ø. Moestrup, N. Daugbjerg, Andreas Altenburger, N. Lundholm
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引用次数: 0

摘要

甲藻科Warnowiceae通常被认为包括一些原生生物中最复杂的细胞。所描述的物种数量约为40种,但物种和一般概念都需要修订。Warnoviaceans通常很脆弱,在光学显微镜下很容易改变形态,通常被认为是罕见的。它们特别以眼睛状的结构而闻名,被称为ocelloid。由于缺乏培养物,对warnowiaceans的研究受到阻碍,因此我们的研究是基于直接从野外样本中获得的细胞。我们提供了对小线虫梳的描述。十一月基于光、扫描和透射电子显微镜,结合核糖体基因的系统发育分析。1908年,基勒湾的Lohmann对其进行了描述,但在丹麦水域很常见,可以观察其分布和行为。发现高细胞丰度的关键条件是温暖的温度和平静的海洋。细胞呈黄色,具有光合性,含有网状叶绿体,此外还有一个ocelloid、毛囊和鱼叉状线虫囊。它们是无性分裂的,但也可以看到平卵体。在线虫囊菌的展示之后,该物种自1928年以来一直被称为Warnowia parva,被转移到线虫属。花序梗的发现表明了混合营养,但所有的喂养实验都未能确定合适的猎物。基于单细胞PCR和大小亚基rDNA序列测定的系统发育分析证实,线虫属和Warnowia属的系统学处于不断变化的状态。
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Studies on the complex Warnowiaceae (Dinophyceae) I. Lohmann’s Pouchetia parva refound and renamed Nematodinium parvum comb. nov. (= Warnowia parva)
The dinoflagellate family Warnowiaceae has often been considered to include some of the most complex cells among the protists. The number of described species is around 40, but both the species and generic concepts are in need of revision. Warnowiaceans are often fragile and readily change morphology under the light microscope, and they are usually regarded to be rare. They are particularly famous for the eye-like structures, termed ocelloids. Studies on warnowiaceans are hampered by lack of cultures, and our studies are therefore based on cells obtained directly from field samples. We provide a description of Nematodinium parvum comb. nov . (syn. Pouchetia parva, Warnowia parva ), based on light, scanning and transmission electron microscopy, combined with phylogenetic analyses of ribosomal genes. It was described in 1908 by Lohmann from Kieler Bay, but is often common in Danish waters, allowing observations on distribution and behaviour. Crucial conditions for finding high cell abundances were periods of warm temperatures and a calm sea. Cells were yellowish, photosynthetic, and contained a net-like chloroplast, in addition to an ocelloid, trichocysts and harpoon-like nematocysts. They divided asexually but planozygotes were also seen. Following the demonstration of nematocysts, the species, which has been known as Warnowia parva since 1928, is transferred to Nematodinium . The finding of a peduncle indicates mixotrophy but all feeding experiments failed to identify a suitable prey. The phylogenetic analyses based on single-cell PCR and sequence determinations of small and large subunit rDNA confirmed that the systematics of Nematodinium and Warnowia is in a state of flux.
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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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