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Comprehensive Description

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Description of Trachelomonas

Euglenids, with plastids, free-swimming, with an envelope with sharply defined neck or collar surrounding an apical pore through which the flagellum emerges; naked cells escape from the envelope after reproduction (and at other times); shape and size of loricas used to define species; loricas upon secretion ed, are colourless and smooth at first but soon becomes brown, ornamented (pores, punctae, spines, warts or ridges) and brittle with ferric hydroxide and manganese salts; with pyrenoids; a few species are colourless and osmotrophic; eyespot and flagellar swelling present; euglenoid movement and cell rotation occur within the envelope; canal opening sub-apical even though the envelope pore is apical; very speciose, almost exclusively freshwater, common in acidic to neutral waters (pH 4.5-7), often in peaty pools and other habitats rich in reduced iron and manganese, cosmopolitan; type species: T. volvocina (Ehrenberg) Ehrenberg 1833.

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