By Janine M. Benyus

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1: The about 20 µm long lorica of Trachelomonas mucosa var. hyalina is smooth and colourless. The typical slime coat is not visible in this specimen. 2: Trachelomonas caudata is about 40 µm long and has a blunt spine on the posterior lorica end. 3: The brownish lorica of Trachelomonas hexangularis is 35 µm long and is formed like an elongated hexagon. 4, 5: Trachelomonas superba, which is common in Simmelried, is about 50 µm long and is thus a comparatively large member of the genus. The lorica is covered with numerous minute spines, which are elongated at the lorica’s ends and on the collar (4, arrowhead).

Typically, the paramylon is deposited in two large grains, often rings (arrowheads). 4, 5: The flat Phacus acuminatus is about 40 µm long and broadly rounded posteriorly, where a short, slightly curved tail emerges. In contrast to the two species ahead, the pellicle is longitudinally striated (5). Usually, a large, discoidal paramylon grain occurs in the centre of the cell; often, it is accompanied by a second, smaller grain in more lateral position (4). The chloroplasts of P. acuminatus are discoidal and 2–3 µm across (5, arrows).

One of the flagella is in the equatorial cingulum (CI), while the other extends in the longitudinal sulcus (SU). The colour of the chloroplasts varies, depending on the ratio of chlorophyll and xanthophyll. 1, 2: The reticulate theca of Peridinium in the light (1, ventral) and scanning electron microscope (2, lateroventral). 3, 4: Peridinium bipes is 40–95 µm long and has two posterior spines (arrows). The ventral surface view shows the distinct sulcus (4). 5: The anterior and posterior plates of P.

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