Molecular Assessment of the Tribes Streblocladieae and Polysiphonieae (Rhodomelaceae, Rhodophyta) in the British Isles Reveals New Records and Species that Require Taxonomic Revision

Piñeiro‐Corbeira, Cristina; Maggs, Christine A.; Rindi, Fabio; Bunker, Francis; Baldock, Lin; Díaz‐Tapia, Pilar

doi:10.5252/cryptogamie-algologie2020v41a8

Cited by 9 publications

(3 citation statements)

References 55 publications

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“…2020, Piñeiro‐Corbeira et al. 2020a,b), highlighting the need to improve molecular datasets in this diverse red algal order for which only a small proportion of the diversity has been molecularly characterized. However, the introduction hypothesis cannot be confirmed for S. arecina , as its potential distribution beyond southern Europe is at present unsupported by the available molecular information.…”

Section: Discussionmentioning

confidence: 99%

Phylogenomic analysis of pseudocryptic diversity reveals the new genus Deltalsia (Rhodomelaceae, Rhodophyta)

Díaz‐Tapia

Rodríguez-Buján

Maggs

et al. 2023

Journal of Phycology

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Molecular analyses, in combination with morphological studies, provide invaluable tools for delineating red algal taxa. However, molecular datasets are incomplete and taxonomic revisions are often required once additional species or populations are sequenced. The small red alga Conferva parasitica was described from the British Isles in 1762 and then reported from other parts of Europe. Conferva parasitica was traditionally included in the genus Pterosiphonia (type species P. cloiophylla in Schmitz and Falkenberg 1897), based on its morphological characters, and later transferred to Symphyocladia and finally to Symphyocladiella using molecular data from an Iberian specimen. However, although morphological differences have been observed between specimens of Symphyocladiella parasitica from northern and southern Europe they have yet to be investigated in a phylogenetic context. In this study, we collected specimens from both regions, studied their morphology and analyzed rbcL and cox1 DNA sequences. We determined the phylogenetic position of a British specimen using a phylogenomic approach based on mitochondrial and plastid genomes. Northern and southern European populations attributed to S. parasitica represent different species. Symphyocladiella arecina sp. nov. is proposed for specimens from southern Europe, but British specimens were resolved as a distant sister lineage to the morphologically distinctive Amplisiphonia, so we propose the new genus Deltalsia for this species. Our study highlights the relevance of using materials collected close to the type localities for taxonomic reassessments, and showcases the utility of genome‐based phylogenies for resolving classification issues in the red algae.

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Section: Discussionmentioning

confidence: 99%

Phylogenomic analysis of pseudocryptic diversity reveals the new genus Deltalsia (Rhodomelaceae, Rhodophyta)

Díaz‐Tapia

Rodríguez-Buján

Maggs

et al. 2023

Journal of Phycology

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“…Kim & Lee, 2012). Similarly, records of Polysiphonia morrowii and P. senticulosa likely belong to the same species, even though both species are regarded as distinct (D'Archino et al, 2013;Stegenga & Karremans, 2015;Piñeiro-Corbeira et al, 2020). Given the widespread nature of cryptic and pseudocryptic diversity in seaweeds, continuous efforts of DNA-assisted identifications through Sanger sequencing will probably continue to revise our view on non-indigenous species.…”

Section: Taxonomic Confidencementioning

confidence: 99%

Non-indigenous seaweeds in the Northeast Atlantic Ocean, the Mediterranean Sea and Macaronesia: a critical synthesis of diversity, spatial and temporal patterns

van der Loos,

Bafort,

Bosch

et al. 2023

European Journal of Phycology

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Effective monitoring and combatting the effect of non-indigenous seaweeds relies on a solid confirmation of the non-indigenous status of the species. We critically analysed the status of presumed non-indigenous seaweed species reported from the Mediterranean Sea, the Northeast Atlantic Ocean and Macaronesia, resulting in a list of 140 species whose non-indigenous nature is undisputed. For an additional 87 species it is unclear if they are native or non-indigenous (cryptogenic species) or their identity requires confirmation (data deficient species). We discuss the factors underlying both taxonomic and biogeographic uncertainties and outline recommendations to reduce uncertainty about the non-indigenous status of seaweeds. Our dataset consisted of over

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“…Macroalgal surveys using molecular tools often result in the discovery of cryptic diversity, finding that morphologically circumscribed species actually involve complexes (Gomes et al., 2020; Hoshino et al., 2020; Leliaert et al., 2009, 2018). Detailed morphological investigation of these complexes often leads to diagnostic characters for the molecularly identified species, so they are pseudocryptic (Díaz‐Tapia, Rodríguez‐Buján, et al., 2022; Hind et al., 2014; Piñeiro‐Corbeira et al., 2020; Tronholm et al., 2013; Verbruggen et al., 2006). However, morphological differences cannot always be found, and the description of true cryptic species that cannot be morphologically distinguished is becoming more frequent (Camacho et al., 2019; Díaz‐Tapia et al., 2021; Díaz‐Tapia, Maggs, et al., 2020; Kraft et al., 2010; Schneider et al., 2017; Soares et al., 2020).…”

Section: Introductionmentioning

confidence: 99%

Resolving the taxonomy of the Polysiphonia scopulorum complex and the Bryocladia lineage (Rhodomelaceae, Rhodophyta)

Díaz‐Tapia,

Verbruggen

2023

Journal of Phycology

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Cryptic diversity is common among marine macroalgae, with molecular tools leading to the discovery of many new species. To assign names to these morphologically similar species, the type and synonyms have to be examined, and if appropriate, new species must be described. The turf‐forming red alga Polysiphonia scopulorum was originally described from Rottnest Island, Australia, and subsequently widely reported in tropical and temperate coasts based on morphological identifications. A recent study of molecular species delineation revealed a complex of 12 species in Australia, South Africa, and Europe. These species are placed in a taxonomically unresolved lineage of the tribe Polysiphonieae. The aim of this study was to resolve the genus‐ and species‐level taxonomy of this complex and related species using molecular and morphological information. Three morphologically indistinguishable species of the complex were found at the type locality of P. scopulorum, preventing a straightforward assignment of the name to any of the molecular lineages. Therefore, we propose a molecularly characterized epitype. Polysiphonia caespitosa is reinstated for the only species found in its type locality in South Africa. We describe seven new species. Only one species of the complex can be morphologically recognized, with the other eight species indistinguishable based on morphometric analysis. The studied complex, together with another seven species currently placed in Polysiphonia and two Bryocladia species, formed a clade distinct from Polysiphonia sensu stricto. Based on observations of Bryocladia cervicornis (the generitype), we describe our seven new species in the genus Bryocladia and transfer another nine species from Polysiphonia to Bryocladia.

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Molecular Assessment of the Tribes Streblocladieae and Polysiphonieae (Rhodomelaceae, Rhodophyta) in the British Isles Reveals New Records and Species that Require Taxonomic Revision

Cited by 9 publications

References 55 publications

Phylogenomic analysis of pseudocryptic diversity reveals the new genus Deltalsia (Rhodomelaceae, Rhodophyta)

Phylogenomic analysis of pseudocryptic diversity reveals the new genus Deltalsia (Rhodomelaceae, Rhodophyta)

Non-indigenous seaweeds in the Northeast Atlantic Ocean, the Mediterranean Sea and Macaronesia: a critical synthesis of diversity, spatial and temporal patterns

Resolving the taxonomy of the Polysiphonia scopulorum complex and the Bryocladia lineage (Rhodomelaceae, Rhodophyta)

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