Microworld

world of amoeboid organisms

Menu
Mrabella plicata
M. plicata, after Hoogenraad and De Groot, 1940

Mrabella plicata (Hoogenraad and De Groot, 1940)

Diagnosis: Test made of small square plates, between which some irregularly polygonal or round ones often are present.
Test generally elongated pyriform. On one third of the length of the shell, at the transition from the neck to the main body, there is swelling on both sides of the surface of the shell, which marks the location of a lateral pore. This is where a bulge-like outline of the fundus originates. This keel gives the shell surface a more or less folded appearance, to which the species name “plicata” refers. In lateral view, the keel shows itself as a tapering of the fundus. The platelets forming the shell do not reach the edge of the mouth; like Q. tropica, this is bordered by a narrow chitinous rim.

Dimensions: Length 111-135 µm; width 49-62 µm.

Ecology: Hoogenraad and De Groot (1940) found this species “in quite large numbers” near Kerintji, Indonesia. “Mrabella plicata was found along with Q. tropica. However, it was not connected to this species by transitions of the shell shape and the size of the two species formed well-separated populations.”

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 »