Revision of the Acanthocystis turfacea species complex, description of Acanthocystis pohjolensis n. sp. and notes on the phylogeny of Acanthocystis

IF 1.6 2区生物学 Q4 MICROBIOLOGY

European journal of protistology Pub Date : 2025-07-07 DOI:10.1016/j.ejop.2025.126159

Savelii A. Poluzerov , Sofiya V. Dmitrovskaya

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引用次数: 0

Abstract

Acanthocystis turfacea Carter, 1863 is the type species of the centrohelid genus Acanthocystis Carter, 1863, which is characterized by bifurcated spine scales. In this study, the organism reported under the name A. turfacea by Zlatogursky and Klimov (2016) is reidentified as A. hymenodes Nicholls, 2023, based on morphological and morphometric evidence. Additionally, a centrohelid with a small cell diameter (7.9–11.9 μm) and distinctive scales, previously attributed to A. turfacea, was isolated from a marine habitat and is described here as a new species, Acanthocystis pohjolensis n. sp. Molecular phylogenetic analysis based on 18S rRNA gene sequences places A. pohjolensis and A. hymenodes in a basal position within the genus Acanthocystis, suggesting that bifurcated spine scales are likely an ancestral trait of this genus. Furthermore, the taxonomic status of A. turfacea ssp. decidens Nicholls, 2023 is revised and elevated to species level as A. decidens Nicholls, 2023 n. stat. The A. turfacea species complex is revisited.

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革面棘囊藻（Acanthocystis turfacea）物种复合体的修订，pohjolensis n. sp.的描述和棘囊藻系统发育的注释

棘囊藻（Acanthocystis turfacea Carter, 1863）是棘囊藻属（Acanthocystis Carter, 1863）的模式种，其特征是棘鳞分叉。在本研究中，根据形态学和形态计量学证据，Zlatogursky和Klimov（2016）以A. turfacea命名的生物被重新鉴定为A. hymenodes Nicholls, 2023。此外，从一个海洋生境中分离到一种具有小细胞直径（7.9 ~ 11.9 μm）和独特鳞片的原属棘囊藻（Acanthocystis pohjolensis n. sp）。基于18S rRNA基因序列的分子系统发育分析表明，a . pohjolensis和a . hymenodes位于棘囊藻属的基础位置，提示棘囊藻可能是该属的一个祖先特征。此外，还研究了其分类学地位。对A. decens Nicholls， 2023进行了修订，并将其提升为A. decens Nicholls, 2023 n. stat.重新审视了A. turfacea物种复群。

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来源期刊

European journal of protistology 生物-微生物学

CiteScore

4.60

自引率

20.70%

发文量

审稿时长

14.6 weeks

期刊介绍： Articles deal with protists, unicellular organisms encountered free-living in various habitats or as parasites or used in basic research or applications. The European Journal of Protistology covers topics such as the structure and systematics of protists, their development, ecology, molecular biology and physiology. Beside publishing original articles the journal offers a forum for announcing scientific meetings. Reviews of recently published books are included as well. With its diversity of topics, the European Journal of Protistology is an essential source of information for every active protistologist and for biologists of various fields.