西印度洋甲藻门角藻属一新种

A New Species of the Genus Tripos Bory From the Western Indian Ocean

记述了海洋甲藻门角藻属一新种,命名为尖头角藻Tripos acuticephalotum sp.nov.。标本于2022年1月1日采自西印度洋海域的站位(63°E,2°S)。新种尖头角藻的形态特征为:细胞大型,背腹扁平,似叶片;总长348μm,上壳远大于下壳;上壳呈尖叶状,横沟以上约1/3处最宽,达112μm;顶端钝突,钝突处两侧边缘不光滑,呈锯齿状;下壳短,底边斜直;两个底角较粗壮,左底角略长于右底角;横沟平直或向左下方略倾斜。

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 348μm,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 112μm.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.