Multi-gene phylogeny reveals a new genus and species of Hapalidiales (Rhodophyta) from Antarctica: Thalassolithon adeliense gen. & sp. nov.

IF 1.5 4区生物学 Q3 MARINE & FRESHWATER BIOLOGY Phycologia Pub Date : 2023-01-02 DOI:10.1080/00318884.2022.2147745

Riccardo Trentin, E. Moschin, A. Grapputo, F. Rindi, S. Schiaparelli, I. Moro

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Abstract

ABSTRACT Non-geniculate coralline algal specimens were collected in 2013 during the XXVIII Italian Expedition to Antarctica in Adélie Cove (Terra Nova Bay; Ross Sea) and deposited in the collections of the Italian National Antarctic Museum (MNAIT, Section of Genoa). Specimens were characterized through a polyphasic approach combining DNA sequence data obtained for four genes (psbA, rbcL, 18S rDNA and cox1) with morpho-anatomical observations. DNA sequences revealed that all specimens belonged to the same species. Phylogenetic reconstructions unambiguously recovered this alga as a member of the order Hapalidiales, but without any close relationship to a genus of this order currently recognized on a molecular phylogenetic basis. Instead, it formed a well-supported lineage with specimens named ‘Hapalidiales sp. ZH-Twist-2019’, collected in New Zealand, for which no formal assignment at genus level has been proposed. Species delimitation methods (ABGD, PTP, GMYC) applied to the psbA dataset indicated that the Adélie Cove coralline alga is a distinct species from all other known hapalidialean species for which such sequences are available. A new genus, Thalassolithon gen. nov., is proposed for T. adeliense sp. nov.

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多基因系统发育揭示了南极单足目（红藻门）的一个新属和新种：Thalassoliton adeliense gen.&sp.nov。

摘要非膝状珊瑚藻标本于2013年在意大利第二十八次南极考察期间在阿德利湾（Terra Nova湾；罗斯海）采集，并存放在意大利国家南极博物馆（MNAIT，热那亚部分）的藏品中。通过将四个基因（psbA、rbcL、18SrDNA和cox1）的DNA序列数据与形态解剖观察相结合的多相方法对标本进行表征。DNA序列显示所有标本都属于同一物种。系统发育重建明确地将这种藻类恢复为单足目的一员，但与目前在分子系统发育基础上公认的该目的一个属没有任何密切关系。相反，它与在新西兰收集的名为“Hapaliales sp.ZH-Twist-2019”的标本形成了一个得到充分支持的谱系，目前尚未提出在属级对其进行正式分配。应用于psbA数据集的物种划界方法（ABGD、PTP、GMYC）表明，Adélie Cove珊瑚藻与所有其他已知的有此类序列的珊瑚藻物种是一个不同的物种。为T.adeliense sp.nov.提出了一个新属，Thalassoliton gen.nov。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Phycologia 生物-海洋与淡水生物学

CiteScore

3.10

自引率

18.80%

发文量

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.