Abstract: A new species of the genus Tripos Bory de Saint-Vincent, 1823: Tripos acuticephalotum sp. nov. was reported in this study. The samples of Tripos were collected from the western Indian Ocean (63°E, 2°S) on January 1, 2022. The morphological characteristics of the new species are as follows. They are large cells, cell considerably flattened dorso-ventrally and leaf like. The total length is 348 μm, and the epitheca is much longer than the hypotheca. The epitheca is sharp leaf shaped, and the widest point at about one-third above the cingulum with about 112 μm. The top of the epitheca is blunt, and the edges on both sides of the blunt protrusion are not smooth and serrated. The hypotheca is short, with a slanted and straight bottom edge. The two antapical horns are relatively thick, with the left slightly longer than the right. The sulcus is straight or inclined towards the lower left.