world of amoeboid organisms

Paramoeba
Paramoeba spec., fresh water, the Netherlands; n = nucleus, p = PLO

Genus Paramoeba Schaudinn, 1896

Diagnosis: Locomotive form with short blunt digitiform subpseudopdia extending from a narrow anterior hyaline margin. Length of cell commonly from 45 to 100 µm. Floating form with thin radiating pseudopodia.
Surface coat with boat-shaped microscales. Always with one or more PLO’s (= Perkinsiella amoebae-like organisms or parasomes or Nebenkörper) located close to the nucleus.
Typespecies: Paramoeba eilhardi Schaudinn, 1896

Ecology: Marine and freshwater.

Remarks: Amoebae of this genus can be confused with PLO-containing amoebae of the genera Neoparamoeba and Janickina.
Hollande (1980) described the PLO or parasome in parasitic amoebae of chaetognaths (Janickina pigmentifera (Grassi, 1881) and J. chaetognathi (Grassi, 1881)) and defined it as a symbiotic organism with a eukaryotic nucleus but lacking kinetosomes, mitochondria, Golgi apparatus and endoplasmic reticulum. He interpreted the DNA-containing structure in the symbiont€™s centre as a kinetoplast and proposed new generic and specific names (Perkinsiella amoebae) for this organism. Analysing individual characters of its cell organisation and using an elimination method of comparison, Hollande (1980) concluded that the closest relatives of Perkinsiella amoebae were kinetoplastid flagellates. As evidence he quoted Cryptobia vaginalis, which according to him had a kinetoplast of a type similar to the DNA structure in P. amoebae.

Paramoeba
Paramoeba
Paramoeba sp.
Paramoeba
Paramoeba
Paramoeba spec., fresh water, the Netherlands; n = nucleus, p = PLO; one specimen with one PLO, the other one with two.
Paramoeba
Ferry Siemensma, created March 2, 2019; last modified February 01, 2021
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