Pediglissa
Pediglissa (from Ancient Greek πέδον 'soil' and French glisser 'to glide') is a subclass of phagotrophic protists that inhabit soil or freshwater habitats. They were defined in 2018 according to phylogenetic analyses that showed a clade containing the orders Cercomonadida and Glissomonadida. They're the sister group of Paracercomonadida.[1]
| Pediglissa | |
|---|---|
Scientific classification  | |
| Domain: | Eukaryota |
| Clade: | Diaphoretickes |
| Clade: | SAR |
| Phylum: | Cercozoa |
| Class: | Sarcomonadea |
| Subclass: | Pediglissa Cavalier-Smith, 2018[1] |
| Orders | |
Morphology and behavior
Pediglissa are biciliate protists that glide on their posterior cilium and have a strong tendency to become amoeboid during feeding, unlike the metromonads. Their pseudopodia are more often shaped like rounded lamellae than finger-like or filose pseudopodia, unlike the paracercomonads. Their anterior cilium is often well developed, unlike in helkesids, but can be short in glissomonads; it moves with an undulating oar-like beat. The trophic cells (i.e. feeding forms) are naked, without a theca, scales, or perles, unlike in Thecofilosea and many freshwater Imbricatea.[1]
Diversity
Pediglissa includes the majority of known cercozoan soil flagellates, all gliding on a single posterior cilium only:[1] the largely bacterivorous Cercomonadida, and the Glissomonadida[2] which include pansomonads and the algivorous Viridiraptoridae of recent description.[3]
References
- Cavalier-Smith, Thomas; Chao, Ema E.; Lewis, Rhodri (April 2018). "Multigene phylogeny and cell evolution of chromist infrakingdom Rhizaria: contrasting cell organisation of sister phyla Cercozoa and Retaria". Protoplasma. 255 (5): 1517–1574. doi:10.1007/s00709-018-1241-1. PMC 6133090. PMID 29666938.
- Howe AT, Bass D, Vickerman K, Chao EE, Cavalier-Smith T (2009). "Phylogeny, Taxonomy, and Astounding Genetic Diversity of Glissomonadida ord. nov., The Dominant Gliding Zooflagellates in Soil (Protozoa: Cercozoa)". Protist. 160 (2): 159–189. doi:10.1016/j.protis.2008.11.007. ISSN 1434-4610.
- Hess S, Melkonian M (2013). "The Mystery of Clade X: Orciraptor gen. nov. and Viridiraptor gen. nov. are Highly Specialised, Algivorous Amoeboflagellates (Glissomonadida, Cercozoa)". Protist. 164 (5): 706–747. doi:10.1016/j.protis.2013.07.003. ISSN 1434-4610.