<unk>  is a genus of amoebae, one of the most common protozoa in soil, and also frequently found in fresh water and other habitats.  The cells are small, usually 15 to 35 μm in length and oval to triangular in shape when moving.  The pseudopods form a clear hemispherical lobe at the anterior, and there are various short filose extensions from the margins of the body.  These give it a spiny appearance, which is what the name<unk>  refers to.  Cysts are common.  Most species are free-living bacterivores, but some are opportunists that can cause infections in humans and other animals.
Acanthamoeba
Blastocystis
Echinococcus
Corpus albicans
Monilethrix
Malassezia
Trichomonas vaginalis
Cryptosporidium