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  Section: Algae » An Overview
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Summaries of the Ten Algal Divisions
  Cyanophyta and Prochlorophyta
Endosymbiosis and Origin of Eukaryotic Algae

They are naked, uninucleate cells that form a net-like plasmodium via filopodia (Figure 1.40). The basic life cycle of these algae comprises ameboid, coccoid, and flagellate cell stages. The ovoid zoospores bear a single flagellum that during swimming wraps around the cell. Chlorarachniophytes are marine. They posses chlorophylls a and b. Each chloroplast has a prominent projecting pyrenoid and is surrounded by four-membrane envelope. Thylakoids are grouped in stacks of one to three. A nucleomorph is present between the second and third membranes of the chloroplast envelope. The origin of this organelle is different from the origin of the cryptophytes nucleomorph, because the chlorarachniophytes originated from a green algal endosymbiont. Paramylon (β-1,3- glucan) is the storage carbohydrate. They are phototrophic and phagotrophic engulfing bacteria, flagellates, and eukaryotic algae. Asexual reproduction is carried out by either normal mitotic cell division or zoospore formation. Sexual reproduction characterized by heterogamy has been reported for only two species.

Plasmodial reticulum of Chlorarachnion, bright field microscope image (a) and schematic
FIGURE 1.40 Plasmodial reticulum of Chlorarachnion, bright field microscope image (a) and schematic
drawing (b). (Bar: 4 µm.)


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