Rigifilida
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Rigifilida is a clade of non-ciliate phagotrophic eukaryotes. It consists of two genera: Micronuclearia and Rigifila.
Characteristics
Cells of rigifilids are covered with either a single or a double-layered submembrane pellicular lamina that makes them rigid in consistence. Slender branching filopodia emanate from a ventral aperture of the cell and are employed to collect bacteria upon which they feed and to attach the organism to the substratum. Around this aperture, the pellicle is reflexed around forming a peristomial collar. Other notable features are flat and irregular shaped mitocondrial cristae, a single dorsal nucleus and the lack of centrioles and cilia.
Phylogeny
| Opimoda | Ancyromonadida Cavalier-Smith 1998 emend. Atkins 2000 Malawimonadea Cavalier-Smith 2003 Amorphea Amoebozoa Lühe 1913 emend. Cavalier-Smith 1998 Obazoa Breviatea Cavalier-Smith 2004 Apusomonadida Karpov & Mylnikov 1989 Opisthokonta CRuMs Mantamonadida Cavalier-Smith 2004 Glissandrida Yazaki et al. 2025 Rigifilida Karpov & Mylnikov 1989 Diphylleida Cavalier-Smith 1993 |
| Ancyromonadida Cavalier-Smith 1998 emend. Atkins 2000 | |
| Malawimonadea Cavalier-Smith 2003 Amorphea Amoebozoa Lühe 1913 emend. Cavalier-Smith 1998 Obazoa Breviatea Cavalier-Smith 2004 Apusomonadida Karpov & Mylnikov 1989 Opisthokonta CRuMs Mantamonadida Cavalier-Smith 2004 Glissandrida Yazaki et al. 2025 Rigifilida Karpov & Mylnikov 1989 Diphylleida Cavalier-Smith 1993 | |
| Malawimonadea Cavalier-Smith 2003 | |
| Amorphea Amoebozoa Lühe 1913 emend. Cavalier-Smith 1998 Obazoa Breviatea Cavalier-Smith 2004 Apusomonadida Karpov & Mylnikov 1989 Opisthokonta CRuMs Mantamonadida Cavalier-Smith 2004 Glissandrida Yazaki et al. 2025 Rigifilida Karpov & Mylnikov 1989 Diphylleida Cavalier-Smith 1993 | |
| Amorphea | Amoebozoa Lühe 1913 emend. Cavalier-Smith 1998 Obazoa Breviatea Cavalier-Smith 2004 Apusomonadida Karpov & Mylnikov 1989 Opisthokonta |
| Amoebozoa Lühe 1913 emend. Cavalier-Smith 1998 | |
| Obazoa | Breviatea Cavalier-Smith 2004 Apusomonadida Karpov & Mylnikov 1989 Opisthokonta |
| Breviatea Cavalier-Smith 2004 | |
| Apusomonadida Karpov & Mylnikov 1989 Opisthokonta | |
| Apusomonadida Karpov & Mylnikov 1989 | |
| Opisthokonta | |
| CRuMs | Mantamonadida Cavalier-Smith 2004 Glissandrida Yazaki et al. 2025 Rigifilida Karpov & Mylnikov 1989 Diphylleida Cavalier-Smith 1993 |
| Mantamonadida Cavalier-Smith 2004 | |
| Glissandrida Yazaki et al. 2025 Rigifilida Karpov & Mylnikov 1989 Diphylleida Cavalier-Smith 1993 | |
| Glissandrida Yazaki et al. 2025 | |
| Rigifilida Karpov & Mylnikov 1989 Diphylleida Cavalier-Smith 1993 | |
| Rigifilida Karpov & Mylnikov 1989 | |
| Diphylleida Cavalier-Smith 1993 | |
Taxonomy
Rigifilida is currently placed in CRuMs.
- Order Rigifilida Cavalier-Smith 2012 [Micronucleariida Cavalier-Smith 2008] Family Rigifilidae Yabuki & Cavalier-Smith 2012 Genus Rigifila Yabuki & Cavalier-Smith 2012 Species Rigifila ramosa Yabuki & Cavalier-Smith 2012 Family Micronucleariidae Cavalier-Smith 2008 Genus Micronuclearia Mikrjukov & Mylnikov 2001 Species Micronuclearia podoventralis Mikrjukov & Mylnikov 2001