These cells are elongated, roughly four-sided, and exhibit a pronounced curve, resembling thread-like structures. They are typically found as solitary organisms. The valves of these cells are exceptionally narrow and linear, with slight tapering at both ends, more pronounced at one end than the other. They vary in length from 1 to 4 millimeters and have a width ranging from 3 to 6 micrometers. Delicate spines adorn the corners of the valves, with a density of approximately three spines per 10 micrometers in the central part of the cell. The number of spines decreases towards the ends of the cell, and in some instances, they may be entirely absent. Occasionally, the entire cell lacks marginal spines. The cell membrane is marked by short marginal ribs, with a density of about 14 to 16 ribs per 10 micrometers. These cells also possess a mucilage pore located near their ends.