Rhizamoeba

{{Automatic taxobox

| image = Rhizamoeba movement.png

| image_caption = Different monopodial shapes of Rhizamoeba (clockwise from top left): worm-like, static, flattened, clavate.

| taxon = Rhizamoeba

| authority = Page 1972 em. Smirnov et al. 2016

| type_species = Rhizamoeba polyura

| type_species_authority = Page 1972

| subdivision_ranks = Species

| subdivision = See text

}}

Rhizamoeba is a small genus of free-living marine naked lobose amoebae in the monotypic family Rhizamoebidae in the order Leptomyxida.{{cite journal |vauthors=Tekle YI, Grant J, Anderson OR, etal |title=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 |journal=Mol. Phylogenet. Evol. |volume=47 |issue=1 |pages=339–52 |date=April 2008 |pmid=18180171 |doi=10.1016/j.ympev.2007.11.015 }}{{cite journal |vauthors=Smirnov AV, Nassonova ES, Cavalier-Smith T |title=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.' |journal=Eur. J. Protistol. |volume=44 |issue=1 |pages=35–44 |date=February 2008 |pmid=17905574 |doi=10.1016/j.ejop.2007.08.001 }} 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:{{cite journal|first1=Alexey |last1=Smirnov|first2=Elena |last2=Nassonova|first3=Stefan |last3=Geisen|first4=Michael |last4=Bonkowski|first5=Alexander|last5=Kudryavtsev|first6=Cedric |last6=Berney|first7=Anna |last7=Glotova|first8=Natalya |last8=Bondarenko|first9=Iva |last9=Dyková|first10=Martin |last10=Mrva|first11=Jose |last11=Fahrni|first12=Jan |last12=Pawlowski|title=Phylogeny and Systematics of Leptomyxid Amoebae (Amoebozoa, Tubulinea, Leptomyxida)|journal=Protist|volume=168|issue=2|date=2017|pages=220–252|issn=1434-4610|doi=10.1016/j.protis.2016.10.006|pmid=28343121 |url=https://www.sciencedirect.com/science/article/pii/S1434461016300670}}

Rhizamoeba saxonica {{small|Page 1974}}
Rhizamoeba polyura {{small|Page 1972}}
Rhizamoeba matisi {{small|Mrva in Smirnov et al. 2017}}

Other possible species are not yet confirmed due to lack of published data or poor documentation. Some of these are: R. schnepfii {{small|Kühn 1996/97}} (considered nomen dubium since it has not been deposited to any culture collection), Trichamoeba caerulea {{small|Schaeffer 1926}} and Trichamoeba clava {{small|Schaeffer 1926}} (both transferred to Rhizamoeba in 1980{{citation|title=Amoeben|journal=Natura|volume=77|date=1980|pages=62–72|vauthors=Siemensma FJ}} but poorly documented), Amoeba clavarioides {{small|Penard 1902}} (identified as R. clavarioides through light microscopy{{cite web |url=https://arcella.nl/rhizamoeba-clavarioides|title=Rhizamoeba clavarioides|last=Siemensma |first=Ferry J.|date=January 31, 2021|website=Microworld, world of amoeboid organisms|access-date=July 31, 2022}}), Polychaos timidum {{small|Bovee 1972}} (identified as R. timidum through light microscopy{{cite web |url=https://arcella.nl/rhizamoeba-timidum|title=Rhizamoeba timidum|last=Siemensma |first=Ferry J.|date=January 31, 2021|website=Microworld, world of amoeboid organisms|access-date=July 31, 2022}}), etc.

References

Category:Amoebozoa genera

Category:Tubulinea