- Type of biliprotein: PE545
- Nucleomorph free in periplastidial space
- Light microscopy: reddish cryptophytes, one plastid with a pyrenoid
- Ultrastructure of Gullardia: sheet-like inner periplast component, longitudinal plates (SPC), gullet, non-keeled rhizostyle (Gillott and Gibbs 1983; Hill and Wetherbee 1990)
- Ultrastructure of Hanusia: sheet-like inner periplast component, rosulate scales (SPC), furrow, keeled rhizostyle (Gillott and Gibbs 1983; Deane et al. 1998)
Evolution and Systematics
Discussion of Phylogenetic Relationships
Since only one strain of each genus has been examined thus far, there is insufficient data to identify potential dimorphisms or inconsistencies in systematics (Marin et al. 1998; Deane et al. 2002; Hoef-Emden et al. 2002). Guillardia theta strain CCMP327 was the model cryptophyte chosen for first nuclear genome sequencing projects. Its complete nucleomorph and plastid genomes have been sequenced (Douglas and Penny 1999; Douglas et al. 2001).