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

Ditrema spec.

Ditrema spec. Ditrema spec. Diagnosis: Shell as with D. longicollis, but much smaller, surrounded by V-shaped structures that gave it the impression of a star.

Read More »

Rotosphaerida

Pompholyxophrys Pompholyxophrys Pompholyxophrys Rabdiophrys Rotosphaerida Rainer, 1968 Diagnosis: Aciliate predominantly spherical or flattened amoebae from which elongated actin-based filopodia extend; with flat discoid mitochondrial cristae;

Read More »

Centropyxis tabel

Key to Centropyxis species 1 Test in dorsal view circular or almost circular 2 – Test in dorsal view irregular due to various outgrows and

Read More »