Microworld

world of amoeboid organisms

Menu
Rhizamoeba
Rhizamoeba spec. – Crailoo, Netherlands 2018

 

Genus Rhizamoeba Page, 1972 emend. Smirnov et al., 2016

Diagnosis: Amoebae altering locomotive morphology from limax-like to flabellate, fan-shaped and possessing collosomes in a single studied species. Uninucleate or possessing limited number (less than 50) nuclei. Cells never adopt expanded, comet-like shapes.
Ultrastructure: In the SSU rDNA sequence remarkable deletion of ca. 20 bp starting from the positions 278 (in the sequence EU719197
Rhizamoeba saxonica CCAP1570/2) (against sequences of Flabellula spp.)

Type species: Rhizamoeba polyura Page, 1972

Known species:

1. Rhizamoeba saxonica Page, 1974
2. Rhizamoeba polyura Page, 1972
3. Rhizamoeba matisi Mrva, 2016

Ecology: Rhizamoeba-species aren’t rare, but often hard to find because they hide usually under debris.

Rhizamoeba clavarioides
Rhizamoeba clavarioides; N Nucleus; B Distinct border between hyaline zone and body; T Trailing filaments
Rhizamoeba clavarioides
Characteristic flow back of hyaloplasm along one side.
Rhizamoeba-spec
Rhizamoeba spec, with very long trailing filaments (arrowed). The largest part of the cell is out of focus.
Rhizamoeba spec. c. 130 µm wide – Florida, garden pond
Rhizamoeba
Rhizamoeba spec. – Crailoo, Netherlands 2018
  • Last updated March 17, 2019
Menu
Recent posts

Penardochlamys arcelloides

May 24, 2020

P. arcelloides – after Penard, 1904 Penardochlamys arcelloides  (Penard, 1904) Deflandre, 1953 Diagnosis: Colorless or very slightly yellowish envelope, bag or cauldron-shaped, very thin, chitinous,

Read More »

Haplomyxa spec

May 13, 2020

Fig. 1: Main cell body of specimen A, partly hidden by debris Haplomyxa sp. Three specimens were observed in a Petri dish, along with two

Read More »

Lachmannia spec.

May 10, 2020

“Lachmannia” spec., body length 127 µm “Lachmannia” spec. I found two cells, size about 125 µm when ovoid, with an organic-walled membranous test and a

Read More »

Diplophrys spec. 7

May 1, 2020

Diplophrys spec., with three tufts of filopodia Diplophrys spec. These cells are granular, never seen before. I found them in a sample from the Bert

Read More »

Psammonobiotus spec.

April 13, 2020

I found this specimen in a sample from the Oppad, near Hilversum, 2020. It is similar to Psammonobiotus linearis, but lacks a clear spine at

Read More »

Sphenoderia compressa

March 26, 2020

Sphenoderia compressa, after Badewitz, 2002 Sphenoderia compressa Badewitz, 2002 Diagnosis: Test ovoid, oval in cross section, hyaline, covered with relatively small, oval, rather irregularly arranged

Read More »