|
Eustigmatophytes are a small group (7 genera; ~12 species) of eukaryotic algae that includes marine, freshwater and soil-living species.〔Hoek, C. van den, Mann, D. G. and Jahns, H. M. (1995). ''(Algae : An introduction to phycology )'', Cambridge University Press, UK.〕 All eustigmatophytes are unicellular, with coccoid cells and polysaccharide cell walls. Eustigmatophytes contain one or more yellow-green chloroplasts, which contain chlorophyll a and the accessory pigments violaxanthin and β-carotene. Eustigmatophyte zoids (gametes) possess a single or pair of flagella, originating from the apex of the cell. Unlike other heterokontophytes, eustigmatophyte zoids do not have typical photoreceptive organelles (or eyespots); instead an orange-red eyespot outside a chloroplast is located at the anterior end of the zoid. Ecologically, eustigmatophytes occur as photosynthetic autotrophs across a range of systems. Most eustigmatophyte genera live in freshwater or in soil, although ''Nannochloropsis'' contains marine species of picophytoplankton (2 → 4 μm). The class was erected to include some algae previously classified in the Xanthophyceae.〔Hoek, C. van den ''et al.'', p. 131.〕 ==See also== * Eustigmatos * Pseudostaurastrum * Vischeria * Nannochloropsis 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Eustigmatophyte」の詳細全文を読む スポンサード リンク
|