rictus (bicosoecid) rictus (bicosoecid) rictus is a genus of bikosea, a small group of unicellular flagellates, included among the heterokonts. rictus scientific classification domain: eukaryota (unranked): sar superphylum: heterokonta class: bikosea subclass: rictidiacavalier-smith, 2013 order: rictidacavalier-smith, 2013 family: rictidaecavalier-smith, 2013 genus: rictusyubuki et al., 2010 species rictus lutensis yubuki et al., 2010