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world of amoeboid organisms

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This location is an large ditch in the nature reserve Naardermeer, in the southern part. My samples came from floating debris in springtime and bottom sediments. The exact location is: GPS 52.28133, 5.11887 (see arrow). The site is located in the centre of the Netherlands.

Remarkable species in this ditch:

Sample location indicated by arrow.
  • Last updated January 31, 2021
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Rhizaspis armata

September 21, 2021

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

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Rhizaspis spinosa

September 21, 2021

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

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Difflugia “pseudoclaviformis”

September 21, 2021

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

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Difflugia from Lolo Pass

September 20, 2021

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

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Foraminifer drome

September 14, 2021

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

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Cyclopyxis spec

August 6, 2021

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

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Difflugia fallax

August 4, 2021

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

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Zivkovicia compressoidea

July 24, 2021

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,

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Zivkovicia flexa

July 24, 2021

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:

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