Spironematellidae (previously known as Spironemidae) is a family of , in the group Hemimastigophora. They vary in size and shape from the ellipsoid Hemimastix amphikineta (14 × 7 μm) to the vermiform Spironematella terricola (43 × 3 μm), and are united by the possession of two rows of Cilium, called kineties.
Phylogenomic analysis shows that Hemimastigophora are a distinct and ancient lineage of Eukaryote organisms, forming a possible sister clade to the supergroup Diaphoretickes.
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