Spironematellidae Silva 1980

Shɨshkin, Yegor, 2022, Spironematella terricola comb. n. and Spironematella goodeyi comb. n (Hemimastigida = Hemimastigea = Hemimastigophora) for Spironema terricola and Spironema goodeyi with diagnoses of the genus and family Spironematellidae amended, Zootaxa 5128 (2), pp. 295-297 : 295

Spironematellidae Silva 1980 em.

Amended diagnosis (from Foissner & Foissner 1993): Small to medium-sized (about 10–60 µm), vermiform to ovoid, more or less distinctly flattened hemimastigids with more or less distinct anterior constriction producing head-like “capitulum”. Two spiralled kineties in more ( Hemimastix ) or less ( Spironematella , Stereonema ) distinct furrows located at the sites where the cortical plates abut. Basal bodies conspicuously short (about as long as wide), each associated with membranous sac, short microtubular ribbon and long microtubular ribbon extending to or slightly beyond posterior kinetid, where it parallels and sometimes touches short ribbon; microtubular ribbons of the same basal body connected by granular material; flagellar basket consisting of 9 filamentous (non-microtubular) arms (transitional fibres) originating from the proximal end of the basal body; transitional plate thick and concave, transitional cylinder inconspicuous. Single nucleus with prominent central nucleolus persisting throughout a division. Contractile vacuole near the posterior end of the body. Extrusomes bottle-like, consisting of cylindroid posterior compartment and rod-like anterior compartment. Food uptake at anterior end; defined oral structures, however, not recognizable.

ZooBank LSID: urn:lsid:zoobank.org:act:34CC9484-3167-42D6-A7E4-E1A5099F66B9 .

Three genera: Spironematella Silva 1970 ; Hemimastix Foissner, Blatterer & Foissner 1988 ; Stereonema Foissner & Foissner 1993 .