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Description of Ceratium horridum

Cells contain numerous yellow-brown chloroplasts. Dorso-ventrally flattened cells with open horns. The epitheca is asymmetric, with rounded left and steep right side; forming a nearly straight anterior horn, directed slightly to the right. The hypotheca is extending into two antapical horns at its posterior edges. They are directed anteriorly. The right horn, if long enough, is almost parallel with the anterior horn. Very variable species (Sournia 1967), difficult to distinguish from C. longipes! The thecal plates are ornamented with a reticulum of ridges and pores. Plates in the central area on the ventral side are very delicate. The nucleus is situated in the epicone.

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Source: BioPedia

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