title: Aurearenophyceae classis nova, a new class of Heterokontophyta based on a new marine unicellular alga Aurearena cruciata gen. et sp. nov. inhabiting sandy beaches.
abstract: A new heterokontophyte alga, Aurearena cruciata gen. et sp. nov., was isolated from sandy beaches in Japan. Isolates were characterized by light and electron microscopy, spectroscopy of pigment composition, and molecular phylogenetic analyses using 18S rDNA and rbcL. The alga usually possessed a cell wall but also retained two heterokont flagella beneath the cell wall. Each walled cell first produced only a single flagellate cell that subsequently divided into two flagellate cells. Electron-opaque vesicles, possibly associated with cell wall formation, were observed beneath the cell membrane. The chloroplast consisted of two compartments, each enclosed by a chloroplast envelope and the inner membrane of the chloroplast endoplasmic reticulum; these two compartments were surrounded by a common outer membrane of chloroplast endoplasmic reticulum. Molecular phylogenetic trees suggested that this alga was a new and independent member of the clade that included the Phaeophyceae and Xanthophyceae (PX clade). A new class, Aurearenophyceae classis nova was proposed for A. cruciata.
authors: Graduate School of Life and Environmental Sciences, University of Tsukuba, 1-1-1 Tennoudai, Tsukuba, Ibaraki 305-8572, Japan.
authors: Atsushi
authors: A
authors: Kai
authors: Yukie
authors: Y
authors: Yoshii
authors: Takeshi
authors: T
authors: Nakayama
authors: Isao
authors: I
authors: Inouye
mesh_terms: D020418:Algal Proteins / Q000235:genetics; D002736:Chloroplasts / Q000648:ultrastructure; D048028:DNA, Algal / Q000235:genetics; D004275:DNA, Ribosomal / Q000235:genetics; D056890:Eukaryota / Q000145:classification* / Q000166:cytology / Q000235:genetics / Q000302:isolation & purification*; D005407:Flagella / Q000648:ultrastructure; D007564:Japan; D008386:Marine Biology; D008969:Molecular Sequence Data; D010802:Phylogeny; D010860:Pigments, Biological / Q000032:analysis; D012337:RNA, Ribosomal, 18S / Q000235:genetics; D012273:Ribulose-Bisphosphate Carboxylase / Q000235:genetics; D017422:Sequence Analysis, DNA
chemical_list: D020418:Algal Proteins; D048028:DNA, Algal; D004275:DNA, Ribosomal; D010860:Pigments, Biological; D012337:RNA, Ribosomal, 18S; C101625:RbcL protein, plastid; D012273:Ribulose-Bisphosphate Carboxylase