stokesia (ciliate) stokesia (ciliate) stokesia is a genus of single-celled ciliates in the family stokesiidae. the only species in this genus is stokesia vernalis. stokesia scientific classification domain: eukaryota (unranked): sar (unranked): alveolata phylum: ciliophora class: oligohymenophorea order: peniculida suborder: frontoniina family: stokesiidae genus: stokesiawenrich, 1929 species stokesia vernalis, wenrich, 1929