Molecular Phylogeny and Taxonomy of the Genus Minidiscus (Bacillariophyceae), with Description of Mediolabrus gen. nov
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Molecular Phylogeny and Taxonomy of the Genus Minidiscus (Bacillariophyceae), with Description of Mediolabrus gen. nov. / Li, Yang; Guo, Xiao-Hui; Lundholm, Nina.
In: Journal of Phycology, Vol. 56, No. 6, 2020, p. 1443-1456.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - Molecular Phylogeny and Taxonomy of the Genus Minidiscus (Bacillariophyceae), with Description of Mediolabrus gen. nov
AU - Li, Yang
AU - Guo, Xiao-Hui
AU - Lundholm, Nina
PY - 2020
Y1 - 2020
N2 - The genusMinidiscuscomprises a group of ecologically-important and globally-distributed planktonic diatoms that are characterized by their small cell size, high mantle and processes more or less concentrated in the valve center. Monoclonal strains were established from collections along the Chinese coast. In the phylogenetic analyses inferred from a LSU and SSU dataset, sixMinidiscusspecies clustered into two well-supported clades. The first clade was located within a larger clade formed mainly byThalassiosirataxa, and the second clade appeared as sister to a clade comprising the genusSkeletonema. Hence, presently knownMinidiscusdo not form a monophyletic clade, but rather make up a phenotypic grouping. Based on the morphology of the type species,M. trioculatus, as well as morphological characters of all taxa in the clade withM. trioculatus,Minidiscusis characterized by having fultoportula(e) in the valve center or sub-centered close to a single rimoportula, and the cells are usually cylindrical.Mediolabrusgen. nov. is proposed to accommodate species in the second clade. The main difference betweenMinidiscusandMediolabrusis the type of process found in the valve (sub-)center, with fultoportula(e) close to a rimoportula in the former, and only a single rimoportula in the latter. According to the above criteria, previously describedMinidiscustaxa were re-examined, and either retained inMinidiscusor transferred toMediolabrus.
AB - The genusMinidiscuscomprises a group of ecologically-important and globally-distributed planktonic diatoms that are characterized by their small cell size, high mantle and processes more or less concentrated in the valve center. Monoclonal strains were established from collections along the Chinese coast. In the phylogenetic analyses inferred from a LSU and SSU dataset, sixMinidiscusspecies clustered into two well-supported clades. The first clade was located within a larger clade formed mainly byThalassiosirataxa, and the second clade appeared as sister to a clade comprising the genusSkeletonema. Hence, presently knownMinidiscusdo not form a monophyletic clade, but rather make up a phenotypic grouping. Based on the morphology of the type species,M. trioculatus, as well as morphological characters of all taxa in the clade withM. trioculatus,Minidiscusis characterized by having fultoportula(e) in the valve center or sub-centered close to a single rimoportula, and the cells are usually cylindrical.Mediolabrusgen. nov. is proposed to accommodate species in the second clade. The main difference betweenMinidiscusandMediolabrusis the type of process found in the valve (sub-)center, with fultoportula(e) close to a rimoportula in the former, and only a single rimoportula in the latter. According to the above criteria, previously describedMinidiscustaxa were re-examined, and either retained inMinidiscusor transferred toMediolabrus.
KW - Chinese coast
KW - diatom
KW - Mediolabrus
KW - Minidiscus
KW - morphology
KW - phylogeny
KW - phytoplankton
KW - GENUS SKELETONEMA BACILLARIOPHYCEAE
KW - DIVERSITY
KW - MORPHOLOGY
KW - COSTATUM
KW - AREOLAE
KW - MARINE
KW - SEA
U2 - 10.1111/jpy.13038
DO - 10.1111/jpy.13038
M3 - Journal article
C2 - 32510583
VL - 56
SP - 1443
EP - 1456
JO - Journal of Phycology
JF - Journal of Phycology
SN - 0022-3646
IS - 6
ER -
ID: 248463744