A taxonomic revision of a Hypnea charoides-valentiae complex (Rhodophyta, Gigartinales) in Japan, with a description of Hypnea flexicaulis sp. nov.

Yamagishi, Yusuke; Masuda, Michio

doi:10.1111/j.1440-1835.2000.tb00127.x

Cited by 28 publications

(38 citation statements)

References 10 publications

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“…Our recent collections of Hypnea flexicaulis from various sites along the southern coasts of Korea corresponds in their habit, branching, and tetrasporangia to the description of Yamagishi and Masuda (2000). According to Yamagishi and Masuda (2000), H. flexicaulis has been erroneously referred to as H. cervicornis J. Agardh in Japan (Tanaka 1941), but the latter species was reduced by Haroun and Prud'homme van Reine (1993) to the synonymy of H. spinella (C. Agardh) Kützing.…”

Section: Discussionmentioning

confidence: 66%

“…It was shown that there is a distinct transition of typical H. spinella, showing a compact form in habitats with rough wave action, into typical H. cervicornis, a more elongate growth form found in habitats with less wave action. However, H. flexicaulis is entirely different from H. spinella and that no species with comparable morphology similar to it has been found among some 50 hitherto described species of Hypnea (Yamagishi and Masuda 2000).…”

Section: Discussionmentioning

confidence: 83%

“…According to Yamagishi and Masuda (2000), H. flexicaulis has been erroneously referred to as H. cervicornis J. Agardh in Japan (Tanaka 1941), but the latter species was reduced by Haroun and Prud'homme van Reine (1993) to the synonymy of H. spinella (C. Agardh) Kützing. It was shown that there is a distinct transition of typical H. spinella, showing a compact form in habitats with rough wave action, into typical H. cervicornis, a more elongate growth form found in habitats with less wave action.…”

Section: Discussionmentioning

confidence: 99%

“…According to Womersley (1994) and Yamagishi and Masuda (2000), H. charoides is characterized by slender spinous branchlets that are mostly directed at rightangles from the parent branch and becoming abruptly curved towards the axis with age and then growing straight like the ordinary branches and adventitious branchlets. That is not the case in reference to the illustrations of H. charoides from Korea as described by Shin and Boo (1994), but the illustrations rather resemble the descriptive morphology of H. flexicaulis from Japan.…”

Section: Discussionmentioning

confidence: 99%

“…Yamagishi & Masuda (2000) studied the genus from Japan and described H. flexicaulis Yamagishi et Masuda as a new species based on samples collected in Ikata, Japan. The species is distinguished by flexuous percurrent main axes and antler-like branches with wide branching angles showing abrupt abaxial bending.…”

Section: Introductionmentioning

confidence: 99%

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Morphology and Molecular Phylogeny of Hypnea flexicaulis(Gigartinales, Rhodophyta) from Korea

Geraldino¹,

Yang²,

Bu³

2006

ALGAE

110

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Morphology and molecular phylogeny of a red algal species, Hypnea flexicaulis that is recently described from Japan, were investigated based on 23 collections from Korea (21), Taiwan (1), and the Philippines (1). Hypnea flexicaulis has percurrent axes with flexuous, antler-like branches which have wide branching angles, and abaxially curved ultimate branchlets. In order to study DNA divergence and phylogenetic relationships of the species, we determined plastid rbcL and mitochondrial cox1 sequences from the 23 collections. All 21 specimens from five different locations in Korea were almost identical to H. flexicaulis from Japan in rbcL sequences. Although there was a difference of three to five base pairs (bp) between samples from Korea and the Philippines or between the Philippines and Taiwan, Bayesian analyses of the rbcL data showed that all specimens from Korea, Japan, the Philippines, and Taiwan were strongly monophyletic. However, it is interesting that specimens from the Philippines differed by 31-34 base pairs in mitochondrial cox1 gene from those of materials from Korea and Taiwan, which differed by one to seven bp in rbcL between them. Although H. boergesenii is different from H. flexicaulis in having many antler-like branchlets, both appeared as sisters in all analyses of the rbcL data. This is the first report of H. flexicaulis from Korea based on morphology, rbcL, and cox1 gene sequences

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Section: Discussionmentioning

confidence: 66%

Section: Discussionmentioning

confidence: 83%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Morphology and Molecular Phylogeny of Hypnea flexicaulis(Gigartinales, Rhodophyta) from Korea

Geraldino¹,

Yang²,

Bu³

2006

ALGAE

110

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Systematics of Hypnea asiatica sp. nov. (Hypneaceae, Rhodophyta) based on morphology and nrDNA SSU, plastid rbcL, and mitochondrial cox1

Geraldino

Yang

Kim³

et al. 2009

TAXON

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Hypnea is an economically and ecologically important red alga including about 53 species worldwide. Here, we describe H. asiatica sp. nov. from Korea, Japan, and Taiwan. Specimens of this species from the northwestern Pacific have often been assigned to H. charoides. Hypnea asiatica is distinguished by percurrent main axes, branches with abruptly curved adaxial branchlets, and the presence of lenticular thickening in the walls of medullary cells. It is abundant in wave‐exposed sites from summer through fall and produces tetrasporangial sori in fall. We analyzed three genes from three different genomes: nuclear SSU rDNA from 27 specimens, plastid rbcL from 51 specimens, and mitochondrial cox1 from 41 specimens, including putative relatives and H. charoides from Australia. All analyzed DNA datasets produced congruent trees in which H. asiatica was always separated from H. charoides. Network analysis of cox1 haplotypes indicated geographic structuring across the species distribution range. Although Hypnea was found to be monophyletic, the distant relationship between H. asiatica and the other species raises questions about divergence pathways within the genus.

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Description of Hypnea pseudomusciformis sp. nov., a new species based on molecular and morphological analyses, in the context of the H. musciformis complex (Gigartinales, Rhodophyta)

Nauer¹,

Cassano²,

Oliveira³

2014

J Appl Phycol

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Hypnea musciformis, a red macroalga widely distributed in tropical and subtropical coasts around the world, has great economic importance as a source of carrageenan for industrial production. In this work, the DNA barcode marker COI-5P and the plastid rbcL gene, in addition to morphological studies, were used to investigate this species on the coast of Brazil and compare it with specimens from other countries. A total of 128 sequences were obtained in this study for 100 specimens from Brazil and 15 specimens from other countries, including the type locality in Italy. The divergence between South American sequences and sequences from Italy for H. musciformis was significantly high for both markers, indicating that the specimens found on the Brazilian coast belong to a different species. Considering the data gathered from molecular markers and morphological analysis, the specimens previously identified morphologically as "H. musciformis", "Hypnea nigrescens", and "Hypnea valentiae" collected in Brazil were considered morphological variations of the new species described in this paper, named Hypnea pseudomusciformis Nauer, Cassano & M.C. Oliveira, sp. nov. The identification of specimens based only on morphological characteristics proved to be unsatisfactory for reasons that could be attributed to phenotypic plasticity in this species. Thus, the technique of DNA barcoding, especially with respect to the COI-5P marker, was essential for the identification and definition of species, revealing scenarios that would otherwise be ignored by using only morphological analysis.

show abstract

A taxonomic revision of a Hypnea charoides-valentiae complex (Rhodophyta, Gigartinales) in Japan, with a description of Hypnea flexicaulis sp. nov.

Cited by 28 publications

References 10 publications

Morphology and Molecular Phylogeny of Hypnea flexicaulis(Gigartinales, Rhodophyta) from Korea

Morphology and Molecular Phylogeny of Hypnea flexicaulis(Gigartinales, Rhodophyta) from Korea

Systematics of Hypnea asiatica sp. nov. (Hypneaceae, Rhodophyta) based on morphology and nrDNA SSU, plastid rbcL, and mitochondrial cox1

Description of Hypnea pseudomusciformis sp. nov., a new species based on molecular and morphological analyses, in the context of the H. musciformis complex (Gigartinales, Rhodophyta)

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