Peritrich is a related term of spirotrich.

As nouns the difference between spirotrich and peritrich

is that spirotrich is any of a large and distinctive group of ciliate protozoa, typically with prominent oral cilia in the form of a series of polykinetids, called the adoral zone of membranelles, beginning anterior to the oral cavity and running down to the left side of the mouth while peritrich is a ciliate protozoan of the subclass ''genus: Peritrichia.