RRC ID 20803
著者 Yoshida M, Noël MH, Nakayama T, Naganuma T, Inouye I.
タイトル A haptophyte bearing siliceous scales: ultrastructure and phylogenetic position of Hyalolithus neolepis gen. et sp. nov. (Prymnesiophyceae, Haptophyta).
ジャーナル Protist
Abstract A haptophyte alga bearing hyaline but conspicuous scales was discovered in surface water samples of Shiribeshi Seamount, Japan. X-ray elemental analysis confirmed that silica was the major element in these scales. These scales were hat-shaped, ellipsoidal in top view, 4-6mum wide and 5-7mum long, perforated by several small pores, and were deposited on cells in several layers. Beneath the siliceous scale layers, organic scales were present, which are typical of haptophytes. The cells were non-motile despite having two short flagella hidden in the scale case. The haptonema, extended over the scale case, and one and a half times the cell length. The intracellular features were typical of haptophytes, including the peripheral endoplasmic reticulum (PER), Golgi cisternae with peculiar dilations, and the flagellar apparatus. The siliceous scales were produced in vesicles in the posterior region of the cell. Motile cells lacking silica scales were observed occasionally when cultures were maintained at lower temperatures and under oligotrophic conditions. This alga was described as Hyalolithus neolepis gen. et sp. nov. Phylogenetic analysis using the SSU rDNA and rbcL gene sequences indicated that Hyalolithus is a member of the Prymnesiales and falls in a clade including Prymnesium, Platychrysis, and Chrysochromulina polylepis. Based on these results, the evolutionary implications of the presence of silicified scales in haptophytes is discussed.
巻・号 157(2)
ページ 213-34
公開日 2006-6-1
DOI 10.1016/j.protis.2006.02.004
PII S1434-4610(06)00026-5
PMID 16647294
MeSH Animals Eukaryota / chemistry Eukaryota / classification* Eukaryota / physiology Eukaryota / ultrastructure* Flagella / ultrastructure Genes, rRNA Japan Life Cycle Stages Phylogeny Phytoplankton / chemistry Phytoplankton / classification Phytoplankton / physiology Phytoplankton / ultrastructure Seawater / microbiology* Silicon Dioxide / analysis*
IF 1.989
引用数 35
WOS 分野 MICROBIOLOGY
リソース情報
藻類 NIES-1393