actiniscus actiniscus actiniscus is a genus of dinoflagellate belonging to the family actiniscaceae. actiniscus scientific classification domain: eukaryota clade: diaphoretickes clade: sar clade: alveolata phylum: myzozoa superclass: dinoflagellata class: dinophyceae order: gymnodiniales family: actiniscaceae genus: actiniscusehrenberg the genus was first described by christian gottfried ehrenberg in 1843. species: actiniscus pentasterias (ehrenberg) ehrenberg