Microworld

world of amoeboid organisms

Menu
Ditrema mukrous
Ditrema mukrous, empty shell

Ditrema mukrous De Saedeleer, 1934

Diagnosis: Shell hyaline, small, with one side fastened to the substrate, with an open base, resembling an iglo; outline circular, often irregular. Shell usually with two opposite apertures, each with a short neck. Young shells colorless, older shells yellow to brown. Pseudopodia granular, fine, extending along the substrate. Nucleus globular with a central nucleolus.

Dimensions: De Saedeleer 12-14 µm; my measurements: 21-28 µm, from aperture to aperture; 9-15 µm in diameter.

Ecology: in water with Sphagnum-contact. Diepveen, Crailoo, Laegieskamp the Netherlands.

Ditrema mukrous
Diagram of Ditrema mukrous. The shell resembles an iglo with two apertures; there is no bottom.
Ditrema mukrous
Ditrema mukrous
Ditrema mukrous
Ditrema mukrous
Ditrema mukrous
Ditrema mukrous
Ditrema mukrous
Ditrema mukrous
Ditrema mukrous
Ditrema mukrous
Ditrema mukrous
All above shells are from the same sample. It shows the variation in shape and color. One shell has three apertures.
Ditrema mukrous
Ditrema mukrous
Apertural view and side view (right): the test resembles an iglo.
Ditrema mukrous
This specimen with one aperture was present in the same wet-mount as the two specimens above. No other specimens were present after two weeks in a wet chamber. It is likely that this specimen is a Ditrema mukrous with one aperture.
Ditrema mukrous - Ferry Siemensma
Ditrema mukrous
Recent posts

Apolimia

A. rotundistoma, from Korganova, 1987 Genus Apolimia Korganova, 1987 Diagnosis: Shell ovoid, quite large, opaque, round in cross section, densely covered with round or oval

Read More »

Erugomicula

E. bidens, 315 and 270 µm, Naardermeer, the Netherlands Genus Erugomicula Nasser, Gregory, Singer, Patterson and Roe, 2021 Typespecies: Erugomicula bidens (Penard, 1902) Diagnosis: laterally-compressed,

Read More »

Erugomicula bidens

Two shells from the same sample, 310 µm (Naardermeer, Netherlands) Erugomicula bidens (Penard, 1902) Basionym: Difflugia bidens Penard, 1902 Diagnosis: Test ovoid, compressed in cross-section,

Read More »

Cylindrothecina

Infraorder Cylindrothecina González-Miguéns et al., 2022   Diagnosis:  can be diagnosed by its specific sequences of the mitochondrial and nuclear DNA  markers (COI, NADH and

Read More »

Organic-walled species

Specimen with an optical cross-section of the peduncle (left) Organic-walled species Diagnosis: Multinucleated organic-walled monothalamous foraminifera. Test spherical to oval shaped, with a hyaline, flexible,

Read More »

Velamentofex tyrolensis

V. tyrolensis, two specimens Velamentofex tyrolensis Völcker and Clauß, 2020 April 2022, I found two specimens in a sample from the pond in Crailoo, Netherlands. I could

Read More »

Raphidiophrys spec. nov.

Raphidiophrys n. sp. Raphidiophrys n. sp. Diagnosis: Plate-scales canoe-shaped, elongated, with tapering, rounded poles, slightly curved upwardly. Light microscopically, these plate-scales show a clear rim;

Read More »

Lacogromia spec. Naardermeer

Lacogromia sp., Naardermeer, the Netherlands, 2022 (n=nucleus) Lacogromia sp. Six living specimens were found in an old sediment sample from a freshwater ditch in nature

Read More »

Sphenoderia rhombophora

S. rhombophora , after Bonnet, 1966 Sphenoderia rhombophora Bonnet, 1966 Diagnosis: Test hyaline, ellipsoidal, very slightly compressed. Fundus relatively narrow. Pseudostome largely truncated. Neck very

Read More »

Sphenoderia ovoidea

S. ovoidea , after Jung, 1942 Sphenoderia ovoidea Jung, 1942 Diagnosis: Shell with four layers of plate-scales. Distinguished from S. fissirostris by the ovoid tapering

Read More »