Comprehensive Description

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Description of Yamagishiella

Colonies cylindrical, ellipsoidal or nearly spherical, with (8), 16 or 32 cells, separated from each other by spaces and arranged peripherally in distinct tiers within a common gelatinous matrix; colonial boundary not penetrating between cells into centre of colony, each cell surrounded tightly by separate fibrillar zone (cellular envelope) of extracellular matrix within tripartite colonial boundary; cells ovoid to spherical, with two equal flagella; chloroplast cup-shaped, longitudinally striated, with a single basal pyrenoid; eyespot present, larger in anterior cells; nucleus central; contractile vacuoles 2; asexual reproduction with a plakeal stage and inversion to form daughter colonies within transparent vesicles in the parental gelatinous matrix; sexual reproduction isogamous, heterothallic; each cell of a colony potentially becoming a gamete; nutrition possibly obligately phototrophic; growing in freshwater pools and ditches, also appearing in cultures from dried soil samples.

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