Pansomonad

The pansomonads, suborder Pansomonadina (known before as order Pansomonadida), are a group of heterotrophic protists that belong to the phylum Cercozoa.[1] Some of them are helioflagellates, with characteristics of heliozoans and amoebo-flagellates.[2]

Pansomonad
Scientific classification Edit this classification
Domain: Eukaryota
Clade: Diaphoretickes
Clade: SAR
Phylum: Cercozoa
Class: Sarcomonadea
Order: Glissomonadida
Suborder: Pansomonadina
Vickerman, 2005 stat. nov. Cavalier-Smith, 2018
Families

Morphology and ecology

They are gliding phagotrophs that inhabit the soil and, unlike Allapsina, typically form rounded lamellar pseudopodia (= lamellipodia) that spread over surfaces. They have two dense rhizoplasts linked with each mature centriole. Their centrioles are orthogona or parallel to each other. The transition zone of their cilia has a dense distal plate. They are either bacterivorous or algivorous—bacterivorous forms may have haptopodia.[1]

Classification

Before they became a suborder of Glissomonadida, pansomonads formed a separate order called Pansomonadida. Phylogenetic analyses consistently showed that the two orders were sister groups, and it was proposed that pansomonads had evolved from glissomonads. At the same time, Viridiraptoridae was recovered as more closely related to the known pansomonads at the time than to any other glissomonad, which prompted the inclusion of viridiraptorids within pansomonads.[3] The current taxonomy of the pansomonads is:[1]

References
  1. 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.
  2. Vickerman K, Appleton PL, Clarke KJ, Moreira D (2005). "Aurigamonas solis n. gen., n. sp., a Soil-Dwelling Predator with unusual Helioflagellate Organisation and Belonging to a Novel Clade within the Cercozoa". Protist. 156: 335–354. doi:10.1016/j.protis.2005.07.003.
  3. Scoble JM, Cavalier-Smith T (2014). "Scale evolution, sequence phylogeny, and taxonomy of thaumatomonad Cercozoa: 11 new species and new genera Scutellomonas, Cowlomonas, Thaumatospina and Ovaloplaca". Eur J Protistol. 50 (3): 270–313. doi:10.1016/j.ejop.2013.12.005. PMID 24667165.
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