Bicosoecida
Bicosoecida (ICZN) or Bicosoecales/Bicoecea (ICBN) is an order of Bikosea, a small group of unicellular flagellates, included among the heterokonts. Informally known as bicosoecids, they are a small group of unicellular flagellates, included among the heterokonts. The cells are free-living, with no chloroplasts, and in some genera are encased in a lorica. The name of the type genus "Bicosoeca" described by James-Clark in 1866 is derived from Greek roots (, vase, bowl, plus "oekein", inhabit). The philologically preferable compound would be "Bicoeca", as "corrected" by Stein in 1878 and followed by most subsequent authors. However, according to  the ICBN and ICZN, the original spelling of the name cannot be considered incorrect and it must be used in its original form. The group was formerly considered to be related to the Chrysophyceae. Some authors use the vernacular term "bicosoecid" (or "bicoecid") in a narrower sense, only for "Bicosoeca", applying "bicoeceans" to "Bicosoeca" and related groups like "Cafeteria". With the advent of using molecular phylogenies to resolve relationships of many eukaryotes the original circumscription of bicosoecids has been greatly expanded upon to include other orders and the rank has changed from an order to a class.