rivulus
/ˈrɪvjʊləs/noun
1- a small tropical American killifish of fresh and brackish water（生活于热带美洲淡水或稍带咸味的水中的）鳉, 溪鳉。
1.1
- Genus Rivulus, family Cyprinodontidae: several species, many of which are spotted.溪鳉属, 鳉科：数种, 其中很多带有斑点。
词源
modern Latin, from Latin, literally 'small stream'.