These cells commonly cluster together, forming star-shaped or zigzag colonies. Whether viewed from the top or side, these cells are elongated and slender, featuring rounded ends. Notably, one end possesses a distinctive hollow protrusion, which becomes apparent when observing the cells in a water mount. These protrusions are specific to the ends of the cells that are not involved in connecting them into colonies. Along the cell margins, small pores lead to minor depressions on the cell’s surface, found on both the main valve and the valve mantle. These pores are smaller and more closely spaced towards the cell’s rounded ends. Externally, the pores are capped with either a simple silica bridge, a triangular arch, or a bridge with flanges along the edges. At each rounded end of the cell, there is a slit-like, tongue-shaped structure, which may be oriented diagonally or perpendicularly in relation to the cell’s central axis.