Microworld

world of amoeboid organisms

Menu
Menu
Difflugia microclaviformis
Difflugia microclaviformis, 156-180 µm (Naardermeer, the Netherlands)

Difflugia microclaviformis (Kourov, 1925)

Diagnosis: Test pyriform, usually with a distinct aboral protuberance; test circular in cross-section, colorless to brown, usually composed of small to medium pieces of quartz; smooth surface and a well defined outline; protuberance often eccentrically placed; neck sometimes slightly bent; pseudostome circular, surrounded by small particles; zoochlorellae observed; nucleus spherical, with ring-shaped nucleolar material scattered through the nucleus.

Dimensions: Kourov 185 µm; Ogden 202-206 µm (n=2); my measurements: 137-186 µm (n>32).

Ecology: In sediment of ditches. Europe.

Remarks: This species might be the same as Difflugia acuminata var. curvata Cash and Hopkinson, 1909

Shells of Difflugia microclaviformis seem to be rare. I found this species only in the sediment of two ditches in the nature reserve Naardermeer (north and south) in the Netherlands. Specimens at both locations were abundant and alive. Between the typical specimens, with protuberances, also specimens with a smooth fundus were present (see the photo below).

Difflugia microclaviformis
Difflugia microclaviformis, 151-186 µm, from the same location as all other specimens on this page.
Difflugia microclaviformis
Difflugia microclaviformis, 175-181 µm (Naardermeer, the Netherlands)
Difflugia microclaviformis
Difflugia microclaviformis
Nucleus of D. microclaviformis from the left specimen in the row above. Nucleus 34 µm in diameter. Left in normal light, right in DIC.
Difflugia microclaviformis
D. microclaviformis, from Kurowa (Kourov), 1925
Recent posts

Kibisidytes

K. marinus, after Jepps, 1934 Kibisidytes marinus Jepps, 1934 Diagnosis: Small amoeboid organism occurring in the sea, attached to the surface film or to some

Read More »

Phaeobola

P. aeris from Dumack et al., 2000 Phaeobola Dumack et al., 2000 Diagnosis: Cells roundish to oval shaped. Shell colorless to amber-colored, rough surface, few

Read More »

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 »