hyalophysa chattoni hyalophysa chattoni hyalophysa chattoni is an apostome ciliate of the order apostomatida. the polymorphic symbiont is carried as an encysted phoront on the exoskeleton of few arthropods belonging to the subphylum crustacea and undergoes metamorphosis during the host's premolt followed by various other life-cycle stages. hyalophysa chattoni scientific classification domain: eukaryota clade: diaphoretickes clade: sar clade: alveolata phylum: ciliophora class: oligohymenophorea order: apostomatida family: foettingeriidae genus: hyalophysa species: h. chattoni binomial name hyalophysa chattonibradbury, 1966