Spironematellidae

Spironematellidae (previously known as Spironemidae) is a family of heterotrophic flagellates, 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 cilia, called kineties.

Phylogenomic analysis shows that Hemimastigophora are a distinct and ancient lineage of eukaryotic organisms, forming a possible sister clade to the supergroup Diaphoretickes.

Classification
The classification of Spironematellidae, as of 2022:




 * Hemimastix Foissner, Blatterer & Foissner, 1988
 * H. amphikineta Foissner, Blatterer & Foissner, 1988
 * H. kukwesjijk Eglit & Simpson, 2018
 * Stereonema Foissner & Foissner 1993 non Kützing 1836
 * S. geiseri Foissner & Foissner 1993
 * Spironematella (=Spironema Klebs 1893 non Vuillemin 1905 non Léger & Hesse 1922 non Rafinesque 1838 non Hochst. 1842 non Lindley 1840 non Meek 1864 )
 * S. multiciliata ( Klebs 1892) Silva 1970 (=Spironema multiciliatum Klebs 1893 )
 * S. terricola (Foissner & Foissner 1993) Shɨshkin 2022 (=Spironema terricola Foissner & Foissner 1993 )
 * S. goodeyi (Foissner & Foissner 1993) Shɨshkin 2022 (=Spironema goodeyi Foissner & Foissner 1993 )