Life history and morphological studies of<i>Punctaria tenuissima</i>(Chordariaceae, Phaeophyceae), a new record for the Azores

Parente, Manuela I.; Fletcher, R. L.; Neto, Ana I.; Tittley, Ian; Sousa, Ana Flávia Ribeiro; Draisma, Stefano G. A.; Gabriel, Daniela

doi:10.1515/bot.2010.030

Cited by 5 publications

(4 citation statements)

References 16 publications

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“…DNA sequences could not differentiate this small form from P. latifolia. This similarity also occurs between P. tenuissima (not known in Japan) and P. latifolia (Parente et al, 2010). On 3 debris items (Mar, Jun), including the Agate Beach dock.…”

supporting

confidence: 56%

Benthic Marine Algae on Japanese Tsunami Marine Debris – a morphological documentation of the species. Part 2 – The brown algae

Hansen¹

2017

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supporting

confidence: 56%

Benthic Marine Algae on Japanese Tsunami Marine Debris – a morphological documentation of the species. Part 2 – The brown algae

Hansen¹

2017

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“…Hecatonema has filamentous thalli, but the sequenced specimen was likely a gametophytic stage of Punctaria sp. 12 . Clade 1 was sister to clade 2 as in the phylogenetic tree based on six and nine genes, but the statistical support was low.…”

Section: Resultsmentioning

confidence: 99%

Discovery of a novel brown algal genus and species Setoutiphycus delamareoides (Phaeophyceae, Ectocarpales) from the Seto Inland Sea, Japan

Kawai

Hanyuda

2021

Sci Rep

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We describe a new genus and species of brown algae from the Seto Inland Sea, Japan. This species is similar to Delamarea in gross morphology and anatomy, but distinctive in having longer thalli with rare branching and shorter cortical cells. In culture, pluri-zoids derived from plurilocular zoidangia on the erect thalli developed into filamentous gametophytes bearing ectocarpoid plurilocular zoidangia, but also formed parenchymatous erect thalli of sub-sympodial growth similar to Trachynema often having branches, and formed lateral and terminal plurilocular zoidangia. Molecular phylogenies using concatenated chloroplast and mitochondrial gene sequences showed the new alga nested in the clade composed of ectocarpalean genera with diffuse growth, parenchymatous thalli, and multiple chloroplasts, but this species is distinctive. Therefore, we propose Setoutiphycus delamareoides gen. & sp. nov. for this new alga, and provisionally place it in Chordariaceae, Ectocarpales. The Seto Inland Sea repeatedly dried during sea level regressions during glacial periods, and the present sea level recovered after the last glacial maximums (LGM), ca. 10,000 years ago. Therefore, it is unlikely that the species evolved within this area. Its distribution in the area may be explained as a remnant population that survived in refugia in southern Japan during the LGM.

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“…Hecatonema has lamentous thalli, but the sequenced specimen was likely a gametophytic stage of Punctaria sp. 12 . Clade 1 was sister to clade 2 as in the phylogenetic tree based on six genes, but the statistical support was low.…”

Section: Molecular Phylogenymentioning

confidence: 99%

Discovery of a novel brown algal genus and species Setoutiphycus delamareoides (Phaeophyceae, Ectocarpales) from the Seto Inland Sea, Japan

Kawai

Hanyuda

2021

Preprint

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A novel brown algal genus and species Setoutiphycus delamareoides (Ectocarpales sensu lato) is described from the Seto Inland Sea, Japan. The species is similar to Delamarea attenuata in gross morphology and anatomy, but distinctive in having longer thalli with rare branching, shorter cortical cells, and occurrence of branches at the tip of plurilocular zoidangia. Erect thalli were epilithic, solitary or caespitose, filiform, simple or rarely branched, attenuated towards the base, blunt at the tip, with uneven surface, yellowish brown in color, up to about 15 cm in height and 2 mm in diameter, parenchymatous, solid when young and later becoming hollow, composed of 1–2 layers of large colorless inner cells, subcortical cells, barrel-shaped large cortical cells of up to 100 µm in height and up to 60 µm in diameter, and phaeophycean hairs. Plurilocular and unilocular zoidangia developed on the same thallus, the former conical to lanceolate, sometimes branched at the tip and projected from the cortical cells, and the latter ovate. Each cell contained many discoidal chloroplasts with projected pyrenoids. In the molecular phylogeny using concatenated DNA sequences of mitochondrial cox1, cox3 and chloroplast atpB, psaA, psbA and rbcL genes, the novel alga nested in the clade composed of ectocarpalean genera of diffuse growth, with parenchymatous thalli with multiple chloroplasts, but was distinctive. Therefore, we propose the establishment of a new genus and species Setoutiphycus delamareoides gen. & sp. nov. for the novel alga, and provisionally place it in Chordariaceae, Ectocarpales sensu lato. As to the biogeography, the Seto Inland Sea repeatedly dried by sea level regression during the glacial periods and the present sea level has recovered after the LGM of ca. 10,000 years ago. Therefore, it is unlikely that the evolution of the genus and species occurred within this area, and its isolated distribution may be explained as a remnant population that survived in the refugia in southern Japan during LGM. It is possible that the species also has a broader distributional range, at least in Japan, such as northern Honshu, but if not, the species can be endangered due to the raise of seawater temperature in the area by global climate change, because the Seto Inland Sea is enclosed at its northern end, so the population cannot spread to colder more northern coasts.

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Life history and morphological studies ofPunctaria tenuissima(Chordariaceae, Phaeophyceae), a new record for the Azores

Cited by 5 publications

References 16 publications

Benthic Marine Algae on Japanese Tsunami Marine Debris – a morphological documentation of the species. Part 2 – The brown algae

Benthic Marine Algae on Japanese Tsunami Marine Debris – a morphological documentation of the species. Part 2 – The brown algae

Discovery of a novel brown algal genus and species Setoutiphycus delamareoides (Phaeophyceae, Ectocarpales) from the Seto Inland Sea, Japan

Discovery of a novel brown algal genus and species Setoutiphycus delamareoides (Phaeophyceae, Ectocarpales) from the Seto Inland Sea, Japan

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