Domain Eucaryota Subdomain Chlorota Doweld (2001) Kingdom Bacillariobiota Doweld (2001) Subkingdom Acanthocystobiotina Doweld, 2001 Phylum Acanthocystozoa Doweld, 2001 Class Gymnophryatea Mikrjukov & Mylnikov, 1998 Order Amphitremida Doweld, 2001 Family Amphitremidae Poche, 1913 1 Genus Amphitrema Archer, 1870