joyeuxella joyeuxella joyeuxella is a genus of parasitic alveolata of the phylum apicomplexa. joyeuxella scientific classification domain: eukaryota (unranked): sar (unranked): alveolata phylum: apicomplexa class: aconoidasida order: achromatorida family: haemohormidiidae genus: joyeuxella species joyeuxellaa toxoides there is one species in this genus - joyeuxella toxoides. history the species and genus was described in 1902 by brazil. description this species infects the digestive tract of the trumpet worm pectinaria koreni malmgren 1866.