Order Leptomyxida Pussard et Pons, 1976, sensu Smirnov et al. 2017

Diagnosis: Naked with locomotive form altering from a flattened expanded or reticulate one, when slowly moving, to a subcylindrical monopodial one when in rapid movement or under specific conditions; adhesive uroid; uninucleate with tendency to have more and with Leptomyxa always multinucleate; glycocalyx amorphous; Rhizamoeba saxonica has collosomes under cell membrane. Leptomyxid amoebae have a tendency to form multinucleate plasmodia which can be flabellate, multilobed, or highly branched and reticulate. Amoebae never have anterior subpseudopodia.

The diagrams below show three typical forms of Leptomyxida:

Leptomyxa
Rhizomonotactic morphotype: locomotive form of Rhizamoeba spec.
Leptomyxa
Stationary flattened form of the same amoeba as above, covered by debris as usual
Leptomyxa
Leptomyxa spec., branched morphotype – from Valamo Island, Russia (Photomicrograph courtesy Alexey Smirnov)
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 »