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Review
.2020 Sep:98:101902.
doi: 10.1016/j.hal.2020.101902. Epub 2020 Sep 18.

Morphological and phylogenetic data do not support the split of Alexandrium into four genera

Kenneth Neil Mertens  1Masao Adachi  2Donald M Anderson  3Christine J Band-Schmidt  4Isabel Bravo  5Michael L Brosnahan  3Christopher J S Bolch  6António J Calado  7M Consuelo Carbonell-Moore  8Nicolas Chomérat  9Malte Elbrächter  10Rosa Isabel Figueroa  5Santiago Fraga  11Ismael Gárate-Lizárraga  12Esther Garcés  13Haifeng Gu  14Gustaaf Hallegraeff  15Philipp Hess  16Mona Hoppenrath  17Takeo Horiguchi  18Mitsunori Iwataki  19Uwe John  20Anke Kremp  21Jacob Larsen  22Chui Pin Leaw  23Zhun Li  24Po Teen Lim  23Wayne Litaker  25Lincoln MacKenzie  26Estelle Masseret  27Kazumi Matsuoka  28Øjvind Moestrup  22Marina Montresor  29Satoshi Nagai  30Elisabeth Nézan  31Tomohiro Nishimura  26Yuri B Okolodkov  32Tatiana Yu Orlova  33Albert Reñé  13Nagore Sampedro  13Cecilia Teodora Satta  34Hyeon Ho Shin  35Raffaele Siano  36Kirsty F Smith  26Karen Steidinger  37Yoshihito Takano  38Urban Tillmann  20Jennifer Wolny  39Aika Yamaguchi  18Shauna Murray  40
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Review

Morphological and phylogenetic data do not support the split of Alexandrium into four genera

Kenneth Neil Mertens et al. Harmful Algae.2020 Sep.

Abstract

A recently published study analyzed the phylogenetic relationship between the genera Centrodinium and Alexandrium, confirming an earlier publication showing the genus Alexandrium as paraphyletic. This most recent manuscript retained the genus Alexandrium, introduced a new genus Episemicolon, resurrected two genera, Gessnerium and Protogonyaulax, and stated that: "The polyphyly [sic] of Alexandrium is solved with the split into four genera". However, these reintroduced taxa were not based on monophyletic groups. Therefore this work, if accepted, would result in replacing a single paraphyletic taxon with several non-monophyletic ones. The morphological data presented for genus characterization also do not convincingly support taxa delimitations. The combination of weak molecular phylogenetics and the lack of diagnostic traits (i.e., autapomorphies) render the applicability of the concept of limited use. The proposal to split the genus Alexandrium on the basis of our current knowledge is rejected herein. The aim here is not to present an alternative analysis and revision, but to maintain Alexandrium. A better constructed and more phylogenetically accurate revision can and should wait until more complete evidence becomes available and there is a strong reason to revise the genus Alexandrium. The reasons are explained in detail by a review of the available molecular and morphological data for species of the genera Alexandrium and Centrodinium. In addition, cyst morphology and chemotaxonomy are discussed, and the need for integrative taxonomy is highlighted.

Keywords: Harmful algal blooms; Paraphyletic; Phylogenetics; Saxitoxin; Spirolides; Taxonomy.

Crown Copyright © 2020. Published by Elsevier B.V. All rights reserved.

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