Revision of the genus Sirodotia Kylin (Batrachospermales, Rhodophyta) with description of four new species

Rossignolo, Natalia L. and Vis, Morgan L. and Paiano, Monica O. and Eloranta, Pertti and West, John A. and Ganesan, E. K. and Yasmin, Farishta and Lim, Phaik-Eem and Necchi, Orlando (2021) Revision of the genus Sirodotia Kylin (Batrachospermales, Rhodophyta) with description of four new species. Cryptogamie Algologie, 42 (8). pp. 93-127. ISSN 0181-1568, DOI

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Most genera of the freshwater red algal order Batrachospermales have been systematically revised using molecular and morphological data, but Sirodotia Kylin remains to be thoroughly reviewed. In this investigation, DNA sequence data for the rbcL, COI-5P and LSU markers of specimens collected worldwide were combined with morphological observations to assess their specific diversity, infer their relationships and evaluate the morphological characters relevant for species identification. Phylogenetic analyses showed the genus to be a monophyletic lineage with high support. Inter- and intra-specific divergence values were well-delineated with higher interspecific (2.1-7% and 4.4-10.5%) and lower intraspecific (0-2.4% and 0-3.8%) variations for rbcL and COI-5P sequences, respectively. LSU sequences revealed lower interspecific divergence values than the COI-5P sequences (0.7-3.3%) indicating less resolution as a barcode marker. Nine species are recognized based on DNA sequence data, morphological characters and geographic distribution. Five species were previously described (S. assamica Necchi, Rossignolo, Yasmin, J.A.West & Ganesan, S. delicatula Skuja, S. huillensis (Welwitsch ex West & GSWest) Skuja, S. kennedyi A.L.Szinte, J.C.Taylor & M.L.Vis and S. suecica Kylin) and four new species are proposed (S. amazonica Necchi, N.L.Rossignolo & M.O.Paiano, sp. nov., S. aquiloamericana Necchi, N.L.Rossignolo & M.L.Vis, sp. nov., S. cryptica Necchi, N.L.Rossignolo & M.O.Paiano, sp. nov. and S. delicatuliformis Necchi, N.L.Rossignolo & M.O.Paiano, sp. nov.). Diagnostic characters for the genus are confirmed to be carpogonia asymmetric with a basal protuberance and carposporophytes diffuse with indeterminant prostrate filaments producing determinate erect branches terminating in carposporangia. The following morphological characters were applied to distinguish species: primary fascicle cell number, spermatangial arrangement, origin of gonimoblast filament and size of carposporangia. Based on morphology, S. sinica, S. segawae and S. yutakae are proposed as synonyms of S. suecica and S. ateleia Skuja of S. delicatula. The status of three species (S. cirrhosa Skuja ex M.S.Balakr. & B.B.Chaugule, S. gardneri Skuja ex Flint and S. huangshanensis Z.X.Shi & S.L.Xie) could not be confirmed due to lack of type specimens and published information on informative diagnostic characters.

Item Type: Article
Funders: Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP)[2016/07808-1], Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP)[2016/16320-205 2], Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPQ)[302415/2017-3], National Science Foundation (NSF)[DEB0235676], National Science Foundation (NSF)[DEB0936855], National Science Foundation (NSF)[DEB1655230], Ministry of Science and Higher Education, Poland[N N304 285937]
Uncontrolled Keywords: Batrachospermales;COI-5P;Freshwater red algae;Biogeography; LSU;Molecular systematics;RBCL;Sirodotia
Subjects: G Geography. Anthropology. Recreation > GC Oceanography
G Geography. Anthropology. Recreation > GE Environmental Sciences
Divisions: Deputy Vice Chancellor (Research & Innovation) Office > Institute of Ocean and Earth Sciences
Depositing User: Ms Zaharah Ramly
Date Deposited: 08 Sep 2022 07:15
Last Modified: 08 Sep 2022 07:15

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