期刊
EUROPEAN JOURNAL OF PHYCOLOGY
卷 50, 期 2, 页码 207-222出版社
TAYLOR & FRANCIS LTD
DOI: 10.1080/09670262.2015.1024287
关键词
algae; Phaeocystis rex; Phaeocystales; Prymnesiophyceae; organic scales; systematics; ultrastructure
资金
- USA National Science Foundation [0951733]
- project OCEANOMICS from the French government
- Investissement d'Avenir [ANR-11-BTBR-0008]
- Direct For Biological Sciences
- Div Of Biological Infrastructure [0951733] Funding Source: National Science Foundation
A morphologically distinct marine species, Phaeocystis rex sp. nov., was described on the basis of light microscopy, transmission electron microscopy and DNA sequence comparisons. Non-motile cells were solitary (non-colonial), 6-10 mu m in diameter and 8-15 mu m long, and possessed chloroplasts with distinctive finger-like lobes. TEM observations demonstrated the presence of two short flagella and a very short haptonema that arose from an invagination of the protoplast. Non-motile cells were surrounded by one to several dense layers composed of scales, presumably unmineralized, and an amorphous material. Phylogenetic analyses based upon combined partial nucleotide sequences for five nuclear- or plastid-encoded genes (18S rRNA, 28S rRNA, 16S rRNA, psbA and rbcL) from cultured strains and from uncharacterized acantharian symbionts confirmed that P. rex was a distinct species. These analyses implied that P. rex occupies an intermediate evolutionary position between solitary and colonial Phaeocystis species.
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