Metachaos kerrii
Metachaos spec.

Genus Metachaos Schaeffer, 1926

Diagnosis: Locomotive form usually between 75 and 500 µm in length, slender and fast moving; pseudopodia cylindrical and smooth with clear hyaline zone; cytoplasm often very granulated with bipiramidal and/or irregular crystals; nucleus discoid or spherical; uroid morulate and temporary. Distinguish from Polychaos.

Ecology: Freshwater and marine.

Type species: Metachaos discoides (Schaeffer, 1916)

Species: Metachaos spec.

The description of Schaeffer (1926) is:

“This genus, for which I propose the name Metachaos, comprises large amebas that move during locomotion by means of determinate pseudopods, that is, pseudopods that direct locomotion. The general shape of the body is oblong, resembling an antler or staghorn. The mass of the body is divided into blunt pseudopods which are cylindrical or sub-cylindrical in shape, without longitudinal folds, such as are observed in the genus Chaos. The granular endoplasm fills the entire ameba, or all but the extreme tips of the advancing pseudopods, and the granules are very evenly distributed, indicating a unified streaming of the endoplasm which involves the whole of the endoplasmic contents. A main pseudopod which leads in locomotion is distinguishable at all times. The whole ameba is therefore continually flowing through a single pseudopod, the main one, though it is always forming a number of others. Or, with a change of tense, the whole ameba will flow through the tip of its one main pseudopod. As the type species I designate the common discoides Schaeffer. The large laureata of Penard belongs in this genus.”

Metachaos kerrii
Metachaos kerrii
Metachaos spec.
Recent posts

Difflugia bicruris

Difflugia bicruris, after Gauthier-Lièvre et Thomas, 1958 Difflugia bicruris  Gauthier-Lièvre et Thomas, 1958 Diagnosis: Test elongate ovoid, in cross section circular, with almost parallel sides;

Read More »

Difflugia congolensis

Difflugia congolensis, after Gauthier-Lièvre et Thomas, 1958 Difflugia congolensis  Gauthier-Lièvre et Thomas, 1958 Diagnosis: Test elongate pyriform, acuminate, with a spine of variable size and

Read More »

Difflugia key ovoid

Difflugia Ovoid Group Key characters: Test ovoid, in cross section rounded. Pseudostome circular. 1 Test with collar or short neck 2 1′ Test without collar

Read More »