actiniscus pentasterias actiniscus pentasterias actiniscus pentasterias is a species of dinoflagellate belonging to the family actiniscaceae. actiniscus pentasterias scientific classification domain: eukaryota clade: diaphoretickes clade: sar clade: alveolata phylum: myzozoa superclass: dinoflagellata class: dinophyceae order: gymnodiniales family: actiniscaceae genus: actiniscus species: a. pentasterias binomial name actiniscus pentasterias(ehrenberg) ehrenberg synonym: dictyocha pentasterias ehrenberg (= basionym)