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Comprehensive Description

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Description of Eudorina

Colonies cylindrical, ellipsoidal or nearly spherical; composed of (8), 16, 32, 64 (or 128) µmostly 32) cells embedded in the periphery of 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 separated from each other by spaces; cells spherical to ovoid, with 2 equal-length apical flagella; chloroplast cup-shaped, sometimes radially striated; pyrenoids one to many; eyespot present; nucleus more or less central; contractile vacuoles 2, anterior, and several others randomly distributed; asexual reproduction with plakeal stage and inversion to form daughter colonies within transparent vesicles in the parental gelatinous matrix, smaller cells often not undergoing division if colony contains different sizes of cells; sexual reproduction anisogamous, homothallic or heterothallic, with large, biflagellate female gametes (eggs) and packets of small, biflagellate male gametes (sperm); male gametes with a slender cytoplasmic protrusion at base of flagella; zygotes spherical, smooth-walled, often with reddish contents; on germination, one or two biflagellate gone cells escaping from zygote wall and dividing into a gone colony; aplanospores observed; nutrition possibly obligately phototrophic; freshwater, widely distributed in pools, ditches, plankton of softwater lakes.

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