Rictus is a genus of Bikosea, a small group of unicellular flagellates, included among the heterokonts. The only species in the genus is Rictus lutensis.
References
^Cavalier-Smith, T; Scoble, J. M. (2013). "Phylogeny of Heterokonta: Incisomonas marina, a uniciliate gliding opalozoan related to Solenicola (Nanomonadea), and evidence that Actinophryida evolved from raphidophytes". European Journal of Protistology. 49 (3): 328–353. doi:10.1016/j.ejop.2012.09.002. PMID23219323.
^Yubuki, N., Leander, B. S., & Silberman, J. D. (2010). Ultrastructure and molecular phylogenetic position of a novel phagotrophic stramenopile from low oxygen environments: Rictus lutensis gen. et sp. nov.(Bicosoecida, incertae sedis). Protist, 161(2), 264-278.