Cochliopodium minus Page, 1976, emend. Kudryavtsev, 2006

Diagnosis: Length in locomotion 15-42 µm, breadth 16-72 µm, length : breadth ratio 0.4-1.5. Fan-shaped or triangular in locomotion; wide anterior hyaloplasm with a ragged edge, sometimes producing short subpseudopodia; short trailing filaments. Spherical vesicular nucleus, 5-10 µm in diameter (average about 7 µm), with central nucleolus, 2-5 µm in diameter (average 4 µm). Scales consist of a circular grid-like base plate, a short central column of numerous densely packed stalks (eight peripheral stalks directly support the apical part) and a funnel-shaped apical part consisting of 17-19 spokes, fine concentric rings and a cross-striated outer rim. Stalks of the central column may fuse to form a monolithic structure in some strains. Observed diameter of the base plate ca. 0.64-0.77 µm, of the apical part, 0.58-0.69 µm, height of the scale 0.17-0.25 µm.

Ecology: Freshwater in USA and England (Page 1976); grassland soil, Scotland, UK.

Remarks: Differs from the species with the structurally similar scales, C. barki, C. minutoidum and C. actinophorum (Kudryavtsev, unpublished) in the proportions of a scale and the structure of the central column; at the LM level, in the ragged anterior edge and the absence of the posterior hyaloplasm during locomotion.

Recent posts

Amphitrema paparoensis

  Amphitrema paparoensis, after Van Oye, 1956   Amphitrema paparoensis  Van Oye, 1956 Diagnosis: Test hyaline, faintly brownish, with a quite distinct neck. In dorsal

Read More »

Amphitrema congolense

  Amphitrema congolense , after Van Oye, 1958   Amphitrema congolense  Van Oye, 1958 Diagnosis: Test sub-cylindrical, regularly ovoid, sometimes slightly pointed towards one pole.

Read More »

Amphitrema aegyptica

Amphitrema aegyptica  Michaeloff, 1936 Remarks: According to Hoogenraad, 1951, the description is just a matter of plagiarism. Hoogenraad showed that the description of A. aegyptica

Read More »

Pyxidicula minitissuma

  Pyxidicula minutissuma, after Brodsky, 1929   Pyxidicula minutissuma  Brodsky, 1929 Diagnosis: Test in the shape of a halved egg with a gracefully rounded tip

Read More »

Pyxidicula gigantea

  Pyxidicula gigantea, after Decloitre, 1965 (n=nucleus)   Pyxidicula gigantea  Decloitre, 1965 Diagnosis: This species is characterized above all by its big size, 360-400 µm

Read More »

Difflugia key bag-shaped

Tests that are bag or thumb-shaped Tests that are bag, finger or thumb-shaped.This group has no taxonomic significance. D. polliciformis D. lemani D. pecac D.

Read More »