Rhizamoeba Explained

Rhizamoeba is a small genus of free-living marine naked lobose amoebae in the monotypic family Rhizamoebidae in the order Leptomyxida.[1] [2] It is most closely related to Leptomyxa and Flabellula, and some species have been moved to Leptomyxa due to molecular data.

Morphology

Members of Rhizamoeba are characterized by their morphology when they move, which is usually monopodial (with a single ramification), alternating between a slug-like shape and a fan shape. They have either one nucleus or multiple (less than 50) nuclei.

Classification

The paraphyly of the genus caused the transfer of two previously rhizamoeban species into Leptomyxa: R. australiensis and R. neglecta. As a result, only 3 species are currently confirmed as Rhizamoeba:[3]

Other possible species are not yet confirmed due to lack of published data or poor documentation.[3] Some of these are: R. schnepfii (considered nomen dubium since it has not been deposited to any culture collection), Trichamoeba caerulea and Trichamoeba clava (both transferred to Rhizamoeba in 1980 but poorly documented), Amoeba clavarioides (identified as R. clavarioides through light microscopy[4]), Polychaos timidum (identified as R. timidum through light microscopy[5]), etc.

Notes and References

  1. Tekle YI, Grant J, Anderson OR, etal . Phylogenetic placement of diverse amoebae inferred from multigene analyses and assessment of clade stability within 'Amoebozoa' upon removal of varying rate classes of SSU-rDNA . Mol. Phylogenet. Evol. . 47 . 1 . 339–52 . April 2008 . 18180171 . 10.1016/j.ympev.2007.11.015 .
  2. Smirnov AV, Nassonova ES, Cavalier-Smith T . Correct identification of species makes the amoebozoan rRNA tree congruent with morphology for the order Leptomyxida Page 1987; with description of Acramoeba dendroida n. g., n. sp., originally misidentified as 'Gephyramoeba sp.' . Eur. J. Protistol. . 44 . 1 . 35–44 . February 2008 . 17905574 . 10.1016/j.ejop.2007.08.001 .
  3. Alexey . Smirnov. Elena . Nassonova. Stefan . Geisen. Michael . Bonkowski. Alexander. Kudryavtsev. Cedric . Berney. Anna . Glotova. Natalya . Bondarenko. Iva . Dyková. Martin . Mrva. Jose . Fahrni. Jan . Pawlowski. Phylogeny and Systematics of Leptomyxid Amoebae (Amoebozoa, Tubulinea, Leptomyxida). Protist. 168. 2. 2017. 220–252. 1434-4610. 10.1016/j.protis.2016.10.006. 28343121 .
  4. Web site: Rhizamoeba clavarioides. Siemensma . Ferry J.. January 31, 2021. Microworld, world of amoeboid organisms. July 31, 2022.
  5. Web site: Rhizamoeba timidum. Siemensma . Ferry J.. January 31, 2021. Microworld, world of amoeboid organisms. July 31, 2022.

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