This species has a very complex life cycle with immature stages that resemble Gymnodinium, Noctiluca and Amphidinium species. In the right example K. velloides measures 100-300u wide, it is transparent and biflagellate. It is cosmopolitan in coastal and open water in temperate and tropical seas. See Horner in Taxonomic References. This sample was collected off Carrie Bow Cay in Belize.