Microworld

world of amoeboid organisms

Menu
Paramphitrema spec.

 

Paramphitrema spec. or Artodiscus saltans?

I found this peculiar species in a sample from the Spiegelplas, end March 2013.  The shell is elliptical, spindle-shaped, as in other species of Paramphitrema, in cross section compressed or circular, with two apertures at opposite poles, more or less ending in two very short tubes. The shell is a flexible membrane, covered with (presumably) minute mineral particles. At each pole about one to four flagella are stretched out, each thin and bending and moving, and with a thickened base. The cytoplasm fills the shell completely. A nucleus could not be observed due to the many food inclusions.
The cell can transform into a more spherical cell with more than two openings, thus resembling exactly Artodiscus saltans! I’ve observed this transformation several times. Also the reverse transformation has been observed.

Dimensions: my measurements of the Paramphitrema-form: 20-29 µm (n=5).

Ecology: Clear freshwater. In sediments of a very shallow sandy shore of the Spiegelplas, the Netherlands.

Remarks: I have seen more than twenty specimens, both in the Artodiscus-form and the Paramphitrema-form. They were constantly moving and tumbling. Therefore it was impossible to get all flagella visible at the same moment in the photomicrographs.

The cells stuck firmly with their flagella to the substrate. When I tried to pick up cells for DNA-sequencing, everything went into the pipette, except the Paramphitrema-cells. When I tried to loosen cells from the substrate with a fine needle, they immediately stuck to the needle. Very frustrating!
Further investigations are needed to clear its taxonomic status.

Paramphitrema Astrodicus saltans
Paramphitrema Astrodicus saltans
This bi-polar cell (left) with two flagella transformed within some seconds into the Artodiscus-form (right), with at least four flagella.
Paramphitrema spec.
Paramphitrema spec.
Specimen with about four flagella at each pole.

Paramphitrema spec.

Paramphitrema spec.
Artodiscus-Paramphitrema
Artodiscus-Paramphitrema
The same cell in two different positions (Artodiscus-form).
Paramphitrema spec.
Paramphitrema spec.
Paramphitrema spec.
Paramphitrema-Artodiscus saltans
Specimen with on pole upward
Recent posts

Arcella guadarramensis

A. guadarramensis – after González-Miguéns et al., 2021 Arcella guadarramensis González-Miguéns & Lara, 2021 Diagnosis: Color ranges from transparent to yellow-orange. Sub hemispherical test shape, with flattened

Read More »

Galeripora

G. naiadis – after González-Miguéns et al., 2021 Genus Galeripora González-Miguéns, Soler-Zamora, Villar-dePablo, Todorov & Lara, 2021 Diagnosis: Tests built exclusively with proteinaceous organic material. Shape more

Read More »

Galeripora naiadis

G. naiadis – after González-Miguéns et al., 2021 Galeripora naiadis González-Miguéns, Soler-Zamora, Villar-dePablo, Todorov & Lara, 2021 Diagnosis: Color ranges from transparent to yellow-orange. The test has

Read More »

Galeripora balari

G. balari – after González-Miguéns et al., 2021 Galeripora balari González-Miguéns & Lara, 2021 Diagnosis: Color ranges from transparent to yellow-orange. General test shape is rounded and

Read More »

Galeripora sitiens

G. sitiens – after González-Miguéns et al., 2021 Galeripora sitiens González-Miguéns, Soler-Zamora, Villar-dePablo, Todorov & Lara, 2021 Diagnosis: Color ranges from transparent to yellow-orange. General test shape

Read More »

Galeripora bufonipellita

G. bufonipellita – after González-Miguéns et al., 2021 Galeripora bufonipellita González-Miguéns & Lara, 2021 Diagnosis: Color ranges from transparent to yellow-orange. General test shape is rounded and

Read More »

Galeripora succelli

G. succelli – after González-Miguéns et al., 2021 Galeripora succelli González-Miguéns & Lara, 2021 Diagnosis: Colour ranges from transparent to yellow-orange. Sub hemispherical test shape, with flattened

Read More »

Galeripora galeriformis

G. galeriformis – after González-Miguéns et al., 2021 Galeripora galeriformis González-Miguéns, Soler-Zamora, Villar-dePablo, Todorov & Lara, 2021 Diagnosis: Colour ranges from transparent to yellow-orange. General test shape

Read More »

Difflugia globulosa – Ogden

Difflugia globulosa, Crailoo, Netherlands, 2021 Difflugia globulosa (Dujardin, 1837) sensu Ogden, 1988 Diagnosis: Shell light to dark brown, spherical, composed of small and large quartz

Read More »

Leptomyxa spec.

Leptomyxa sp. Leptomyxa sp. Diagnose: Slowly moving amoeba with a long tubular body with some lobopodia at both ends extending in several directions and also

Read More »