Microworld

world of amoeboid organisms

Menu
Limnofila cf oxoniensis

Limnofila oxoniensis Bass and Cavalier-Smith, 2009

Diagnosis: cell bodies roughly elliptical or often irregular with polygonal outline; often in pairs or small clusters, or aligned longitudinally, connected (or apparently so) via filopodia; extremely slender filopodia extend from the cell often most prominently from the longitudinal apices, sometimes radiate more evenly though not so regularly as to confer radial symmetry. Filopodia several to 10X body length; attached to substrate; often branched, sometimes apparently anastomosing, granular, often heavily; granules often motionless but can move slowly along them. Filopodia decrease in thickness and visibility within creasing distance from the cell body; distally [1]0.1 mm wide, visible only under excellent optics; movement of cell bodies across substrate very rare or indiscernible. No flagellate phase or cysts.

Dimensions: cell bodies 7-25 µm.

Ecology: Bacterivorous. Type locality Oxford garden soil. I find this species sometimes in wet mounts kept in a moist chamber. I have found it in sediments from several locations in the Netherlands.

Remarks: Differs from L. mylnikovi in forming looser clusters or isolated cells not always connected by cytoplasmic strands; cell bodies usually much larger; filopodial anastomoses more common.

The cells in the photomicrographs on this page were present in moist chamber preparations from freshwater sediments. They had long branching granulofilopodia, and the cytoplasm in the body was constantly turning and moving.

Limnofila cf oxoniensis
Limnofila cf oxoniensis  freshwater, Laegieskamp, the Netherlands
Limnofila cf oxoniensis  freshwater, Laegieskamp, the Netherlands

Limnofila cf oxoniensis  freshwater, Laegieskamp, the Netherlands
Limnofila cf oxoniensis  freshwater, Laegieskamp, the Netherlands
Limnofila cf oxoniensis: Two cells with long granulated filopodia
These cells were photographed one day after the first picture above. One cell has divided.
Four cell s with a number of granulopodia (also see the detail below)
The same cells as in the photomicrograph above
Limnofila oxoniensis
Three cells, each body about 8 µm long, with long branching granulopodia in contact with the substrate.
Limnofila oxoniensis
Compare the filopodia with those on the first photomicrograph; they are contracted or stretched. Time between both photos 15 seconds.
Limnofila oxoniensis
The same cells in normal illumination. No relevant details as nucleus and crystals were visible.
Recent posts

Rhizaspis armata

R. armata, 68 µm long, excl. spines – Laegieskamp Rhizaspis armata (Lauterborn, 1901) Dumack et al., 2021 Basionym: Pamphagus armatum Lauterborn, 1890 Diagnosis: Theca membranous,

Read More »

Rhizaspis spinosa

The original description with original drawings, Penard, 1890. Rhizaspis spinosa (Penard, 1890) Dumack et al., 2021 Basionym: Trinema spinosum Penard, 1890 Diagnosis: Theca membranous, ovoid

Read More »

Difflugia “pseudoclaviformis”

Difflugia “pseudoclaviformis”, front and side view, 424 µm Difflugia “pseudoclaviformis” Diagnosis: Shell pyriform, compressed, with a more or less pronounced aboral protuberance; shell composed of

Read More »

Difflugia from Lolo Pass

Shells 461-448 µm, stacked image. I found this large en remarkable shells in sediment of a small mountain lake near Lolo Pass, Montana USA. It differs

Read More »

Foraminifer drome

Unknown species, collected from the river Drôme, France, 2021 Unknown species September 2021, I found about ten specimens of an agglutinated foraminifer in a sample

Read More »

Cyclopyxis spec

Cyclopyxis spec., 168 µm Cyclopyxis spec. Diagnosis: Shell circular in ventral and dorsal view, more or less hemispherical in lateral view (height/diameter ≈ 0.5); lateral

Read More »

Difflugia fallax

Difflugia fallax, from Penard, 1902 Difflugia fallax Penard, 1890 Diagnosis: Shell hyaline or yellowish-greenish, black at low magnification, round in cross section, formed of a

Read More »

Zivkovicia compressoidea

Z. compressoidea, a-b after Chardez, 1958; c after Jung, 1942 Zivkovicia compressoidea  (Jung, 1942) new.comb. Basionym: Pontigulasia compressoidea Jung, 1942 Diagnosis: Shell ovoid and compressed,

Read More »

Zivkovicia flexa

Z. flexa, from Cash and Hopkinson, 1909 Zivkovicia flexa  (Cash and Hopkinson, 1909) Ogden, 1983 Basionym: Pontigulasia compressa var. flexa  Cash and Hopkinson, 1909 Diagnosis:

Read More »

Lagenodifflugia epiouxi

L. epiouxi, after Chardez, 1984 3 Lagenodifflugia epiouxi (Chardez, 1983) new comb. Basionym: Pontigulasia epiouxi Chardez, 1983 Diagnosis: Shell elongate, circular in cross-section or very

Read More »