Revision of Batrachospermum section Macrospora (Batrachospermales, Rhodophyta) with the establishment of the new genus Montagnia

Necchi, Orlando; Fo., Auro Silva Garcia; Paiano, Monica O.; Vis, Morgan L.

doi:10.1080/00318884.2019.1624143

Cited by 26 publications

(16 citation statements)

References 34 publications

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“…The population from Nepal had more robust plants (larger whorls and higher fascicle cells), longer carpogonial branches and larger spermatangia and carpospophytes than all other populations of Sheathia examined in this study (Table 2). Despite these morphological differences, the sequence divergence of the population from India (1%) is within the currently accepted ranges to be interpreted as a single species (up to 2.5%) in members of the Batrachospermales (Necchi et al 2019b and references therein). (Fig.…”

Section: Discussionmentioning

confidence: 85%

“…Investigations focusing on the infrageneric taxa of the genus have been conducted to correct the paraphyly of Batrachospermum. As a consequence, several sections have been raised to the genus level: Kumanoa (former sections Contorta and Hybrida) (Entwisle et al 2009), Sheathia (former section Helminthoidea) (Salomaki et al 2014), Torularia (= Atrophycus, former section Setacea) (Rossignolo and Necchi 2016), Virescentia (formerly a section with the same name), Acarposporophycos (former section Acarposporophytum) and Visia (former section Aristata) (Necchi et al 2019a), Montagnia (Necchi et al 2019b).…”

Section: Methodsmentioning

confidence: 99%

“…Protocols for DNA extraction, polymerase chain reaction (PCR) amplification, purification and sequencing are the same as those described in our previous studies: Rossignolo and Necchi (2016), Necchi et al (2019aNecchi et al ( , 2019b. Two molecular markers were analyzed: the barcode region of the COI-5P, and the plastid-encoded rbcL.…”

Section: Molecular Analysesmentioning

confidence: 99%

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Diversity of the genus <italic>Sheathia</italic> (Batrachospermales, Rhodophyta) in northeast India and east Nepal

Necchi¹,

West²,

Ganesan³

et al. 2019

ALGAE

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Freshwater red algae of the order Batrachospermales are poorly studied in India and Nepal, especially on a molecular basis. During a survey in northeast India and east Nepal, six populations of the genus Sheathia were found and analyzed using molecular and morphological evidence. Phylogenetic analyses based on the rbcL gene sequences grouped all populations in a large clade including our S. arcuata specimens and others from several regions. Sheathia arcuata represents a species complex with a high sequence divergence and several smaller clades. Samples from India and Nepal were grouped in three distinct clades with high support and representing new cryptic species: a clade formed by two samples from India, which was named Sheathia assamica sp. nov.; one sample from India and one from Nepal formed another clade, named Sheathia indonepalensis sp. nov.; two samples from Nepal grouped with sequences from Hawaii and Indonesia (only 'Chantransia' stages) and gametophytes from Taiwan, named Sheathia dispersa sp. nov. Morphological characters of the specimens from these three species overlap one another and with the general circumscription of S. arcuata, which lacks the heterocortication (presence of bulbous cells in the cortical filaments) present in other species of the genus Sheathia. Although the region sampled is relatively restricted, the genetic diversity among specimens of these three groups was high and not closely related in the phylogenetic relationship with the other clades of S. arcuata. These data corroborate information from other groups of organisms (e.g., land and aquatic plants) that indicates this region (Eastern Himalaya) as a hotspot of biodiversity.

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Section: Discussionmentioning

confidence: 85%

Section: Methodsmentioning

confidence: 99%

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Diversity of the genus <italic>Sheathia</italic> (Batrachospermales, Rhodophyta) in northeast India and east Nepal

Necchi¹,

West²,

Ganesan³

et al. 2019

ALGAE

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“…The morphological vouchers are housed at the Floyd Bartley Herbarium at Ohio University (BHO), Institute of Nature Conservation, most sections have since been elevated to genus level and true Batrachospermum now contains only a handful of species (Vis et al 2020). For example, members of the sections Acarposporophytum, Aristata, Macrospora, Turfosa, and Virescentia now belong to the genera Acarposporophycos, Visia, Montagnia, Paludicola, and Virescentia, respectively (Necchi et al 2018, 2019a, 2019b.…”

Section: Sample Collectionmentioning

confidence: 99%

Revealing hidden diversity in the Sheathia arcuata morphospecies (Batrachospermales, Rhodophyta) including four new species

Vis¹,

Tiwari²,

Evans³

et al. 2020

ALGAE

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The freshwater red algal genus Sheathia contains species with heterocortication (both bulbous and cylindrical cells covering the main axis) and homocortication (only cylindrical cells). When the genus was proposed, the species with heterocortication were revised, but all specimens with homocortication were assigned to Sheathia arcuata with the caveat that it may represent a species complex. Recent studies have described new species with homocortication and S. arcuata has been rendered paraphyletic. In the current study, new sequences of the rbcL and 5′ region of the cytochrome c oxidase subunit I markers were combined with previously published data to construct a robust phylogeny and circumscribe new species. Four new species, S. abscondita, S. californica, S. plantuloides, and S. transpacifica are proposed. Examination of morphological characters among homocorticate species show no diagnostic characters to distinguish among species, whereas S. plantuloides is only known from sporophytes (chantransia) so it lacks the typical morphological characters derived from the gametophytes for comparison. Although DNA sequence data would be needed to make a positive species identification, geography could be employed to narrow the identification to one or two species. The genus is geographically widespread having been recorded from oceanic islands and five continents, whereas the individual species typically occur on a single continent. With this study, the number of species recognized in Sheathia is raised to 17; seven heterocorticate and 10 homocorticate, making this genus one of the most species rich in the Batrachospermales. As well, the resulting phylogeny provides insights into the evolution of heterocortication in Sheathia.

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“…Section Virescentia was raised to genus level under the name Virescentia (Necchi et al 2018). Sections Acarposporophytum and Aristata were raised to generic status under the names Acarposporophycus and Visia (Necchi et al 2019b), and section Macrospora to genus Montagnia (Necchi et al 2019a). Two new genera were recently added: Volatus (Chapuis et al 2017) with three species from North America and Europe, and the monotypic Lympha with Lympha mucosa (Evans et al 2017).…”

Section: Phylogenetic Relationships Of Batrachospermum and Related Gementioning

confidence: 99%

The freshwater red algae (Batrachospermales, Rhodophyta) of Africa and Madagascar I. New species of Kumanoa, Sirodotia and the new genus Ahidranoa (Batrachospermaceae)

Fischer¹,

Gerlach²,

Killmann³

et al. 2020

Plant and Fungal Systematics

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Our knowledge of the diversity of African freshwater red algae is rather limited. Only a few reports exist. During our field work in the last five years we frequently encountered freshwater red algae in streams in Rwanda and Madagascar. Here we describe four new species and one new genus of freshwater red algae from the Batrachospermales, based on morphological and molecular evidence: Kumanoa comperei from the Democratic Republic of the Congo and Rwanda is related to K. montagnei and K. nodiflora; Kumanoa rwandensis from Rwanda is related to K. ambigua and K. gudjewga; Sirodotia masoalensis is related to S. huillensis and S. delicatula; and the new genus and species Ahidranoa madagascariensis from Madagascar is sister to Sirodotia, Lemanea, Batrachospermum s.str. and Tuomeya. There is also evidence for the presence of Sheathia, which was recorded as yet-unidentifiable Chantransia stages. These are among the first new descriptions since 1899 from the African continent and since 1964 from Madagascar. A short history of the exploration of freshwater red algae from Africa and Madagascar is provided. All new taxa are accompanied by illustrations and observations on their ecology.

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Revision of Batrachospermum section Macrospora (Batrachospermales, Rhodophyta) with the establishment of the new genus Montagnia

Cited by 26 publications

References 34 publications

Diversity of the genus <italic>Sheathia</italic> (Batrachospermales, Rhodophyta) in northeast India and east Nepal

Diversity of the genus <italic>Sheathia</italic> (Batrachospermales, Rhodophyta) in northeast India and east Nepal

Revealing hidden diversity in the Sheathia arcuata morphospecies (Batrachospermales, Rhodophyta) including four new species

The freshwater red algae (Batrachospermales, Rhodophyta) of Africa and Madagascar I. New species of Kumanoa, Sirodotia and the new genus Ahidranoa (Batrachospermaceae)

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