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419 results on '"Matsuoka, Kazumi"'

157. Relationship between the dinoflagellate cyst Spiniferites pachydermus and Gonyaulax ellegaardiae sp. nov. from Izmir Bay, Turkey, and molecular characterization.

Author

Mertens, Kenneth Neil, Aydin, Hilal, Uzar, Serdar, Takano, Yoshihito, Yamaguchi, Aika, Matsuoka, Kazumi, and Lin, S.

Subjects
DINOFLAGELLATE cysts, GONYAULACACEAE, ALEXANDRIUM, MOTILITY of algae
Abstract

Here, we established the cyst-motile stage relation-ship for Spiniferites pachydermus through incubation of cysts with a characteristically microreticulate/perforate surface isolated from Izmir Bay in the eastern Aegean Sea of the eastern Mediterranean. The morphology of the motile stage was similar to Gonyaulax spinifera but had a different size, overhang, displacement and reticulations. Based on the distinct morphology of the cyst and morphological differences in motile cells, we assigned S. pachydermus from Izmir Bay to the new species Gonyaulax ellegaardiae. We elucidate the phylogenetic relationship of G. ellegaardiae through large and small subunit ribosomal DNA and show that it forms a clade with other species that belong to the G. spinifera complex. [ABSTRACT FROM AUTHOR]

Published
2015
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158. Cyst-theca relationship of a new dinoflagellate with a spiny round brown cyst, Protoperidinium lewisiae sp. nov., and its comparison to the cyst of Oblea acanthocysta.

Author

Mertens, Kenneth Neil, Takano, Yoshihito, Gu, Haifeng, Yamaguchi, Aika, Pospelova, Vera, Ellegaard, Marianne, and Matsuoka, Kazumi

Subjects
DINOFLAGELLATES, CYSTS (Pathology), SEDIMENTS, RECOMBINANT DNA, SCANNING electron microscopy
Abstract

Round spiny brown cysts with apiculocavate processes were isolated from sediments of Lake Saroma, Japan, Changle Harbor, East China Sea, China, Jinzhou Harbor, Bohai Sea, China, and San Pedro Harbor, California, USA. Superficially similar round spiny brown cysts of the species, Oblea acanthocysta were, for comparison, restudied through light microscopy and scanning electron microscopy ( SEM) and by sequencing of small subunit ( SSU) and large subunit ( LSU) rDNA obtained through a single cyst from Lake Saroma. These morphological measurements and SEM observations showed that the new cysts can be discriminated from O. acanthocysta by the archeopyle, number of processes, shape of process bases and its apiculocavate processes . Based on LSU sequences, the most closely related species was Protoperidinium monovelum, for which no cyst stage has been described so far. However, the thecal morphology of the specimens found in this study differed from P. monovelum in details of the sulcal plates and shape of apical pore and 2a plate. We therefore describe Protoperidinium lewisiae sp. nov., which can be found in estuarine subtropical to temperate waters of the Pacific Ocean. [ABSTRACT FROM AUTHOR]

Published
2015
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159. Cyst-theca relationships and phylogenetic positions of Peridiniales ( Dinophyceae) with two anterior intercalary plates, with description of Archaeperidinium bailongense sp. nov. and Protoperidinium fuzhouense sp. nov.

Author

Liu, Tingting, Mertens, Kenneth Neil, Ribeiro, Sofia, Ellegaard, Marianne, Matsuoka, Kazumi, and Gu, Haifeng

Subjects
ALGAE, PHYLOGENY, MOTILITY of algae, PERIDINIALES, INTERNEURONS, DINOFLAGELLATE cysts, CINGULATE cortex
Abstract

Protoperidinium species with two anterior intercalary plates were originally classified by Jörgensen in the subgenus Archaeperidinium and assigned to the sections Excentrica, Avellana and Archaeperidinium by Taylor, on the basis of the relative size of anterior intercalary plates and the extent of cingulum displacement. Phylogenetic relationships among these three sections have not been fully explored. Recently, Archaeperidinium was reinstated as a genus, but several species fitting the emended description have not been transferred formally as molecular data were not available. In the present study we examined the cyst-theca relationship of seven species with two anterior intercalary plates: four species assigned to Protoperidinium and three to Archaeperidinium, from the China Sea. Partial large subunit ribosomal DNA sequences were obtained from these seven species by single-cell polymerase chain reaction, and for the cyst of Protoperidinium stellatum from France. Two new species, Archaeperidinium bailongense and Protoperidinium fuzhouense, were described based on both theca and cyst morphology, and the cyst-theca relationships of A. constrictum and P. abei var. rotunda were established for the first time. Maximum-likelihood and Bayesian inference analyses revealed that P. fuzhouense was nested within the Protoperidinium sensu stricto clade despite having only six postcingular plates, and sections Excentrica, Avellana and the genus Archaeperidinium were all monophyletic. Our results suggest that the presence/absence of a sulcal fin and antapical horns and the displacement of the cingulum are the most stable characteristics of the motile stages within the respective clades. [ABSTRACT FROM AUTHOR]

Published
2015
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160. Identification of the resting cyst of Cochlodinium polykrikoides Margalef ( Dinophyceae, Gymnodiniales) in Korean coastal sediments.

Author

LI, Zhun, Han, Myung‐Soo, Matsuoka, Kazumi, Kim, So‐Young, Shin, Hyeon Ho, and Lin, S.

Subjects
MICROBIAL cysts, DINOFLAGELLATES, COASTAL sediments, MICROORGANISM morphology, MOLECULAR phylogeny, ALGAL cells, PHYSIOLOGY
Abstract

This study provides the first morphological features of resting cysts of Cochlodinium polykrikoides collected from Korean coastal sediments. Evidence for the existence of resting cysts of C. polykrikoides is based on the morphological and molecular phylogenetic data of the germinated cells and a resting cyst. The morphology of the resting cysts differed from that reported previously in sediments and culture experiments. The distinct feature is that the cyst body was covered by the reticulate ornaments and spines. [ABSTRACT FROM AUTHOR]

Published
2015
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172. Preface

Author

Matsuoka, Kazumi, primary and Horiguchi, Takeo, additional

Published
2004
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195. Brigantedinium majusculumis the cyst of Protoperidinium sinuosum(Protoperidiniaceae, Dinophyceae)

Author

Li, Zhun, Matsuoka, Kazumi, Shin, Hyeon Ho, Kobayashi, Satori, Shin, Kyungsoon, Lee, TaeHee, and Han, Myung-Soo

Abstract

Abstract:Two morphologically distinct species, Brigantedinium majusculumand Trinovantedinium applanatum, have been suggested as a cyst stage of Protoperidinium pentagonum; however, the cyst–theca relationships are still virtually undefined. In this study, we re-examined the motile stage of B. majusculumvia thecal plate analysis together with a molecular phylogenetic analysis based on partial large-subunit ribosomal DNA gene sequences. The morphological features of motile cells germinated from B. majusculumwere identical to those of Pr. sinuosum, and the molecular phylogenetic analysis showed that the germinated cells and B. majusculumare closely related to Pr. pentagonumand Pr. latissimumas a sister group. Additionally, high sequence divergences were observed between the germinated cells and B. majusculumas well as Pr. pentagonumand Pr. latissimum(18.0–19.5% according to P-values and 20.7–22.9% according to Kimura two-parameter values). On the basis of these results, our study indicates that B. majusculumshould be accepted as the cyst of Pr. sinuosum.

Published
2015
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