world of amoeboid organisms

Menu

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

Spiculophrys

Genus Spiculophrys Zlatogursky, 2016 Diagnosis: Centrohelids lacking silica scales but with numerous thin, pointed organic (without any traces of silica) scales tapering towards acute apices. 18S

Read More »

Acanthocystis drakena

From Zlatogursky, 2016 Acanthocystis drakena Zlatogursky, 2016 Diagnosis: Cells are 21.1-30.5 µm (ca. 26.7) in diameter. Cell is covered with oval plate-scales having a margin

Read More »

Choanocystis symna

From Zlatogursky, 2014 Choanocystis symna Zlatogursky, 2014 Diagnosis: Cell body ca. 6.7 µm in diameter. Axopodia three–five times longer than a cell diameter. Plate-scales dumbbell-shaped

Read More »

Acanthocystis costata

From Zlatogursky, 2014 Acanthocystis costata Zlatogursky, 2014 Diagnosis: Cell body ca 9.5 µm in diameter. Axopodia 2–3 times longer than cell diameter. Length of spine-scales

Read More »

Kinetocyst

Left: ultra-structure of a kinetocyst of Raphidiophrys contractilis); right: two kinetocysts in an axopodium. Kinetocysts In centrohelid heliozoa, extrusomes are called kinetocysts, and are present

Read More »

Yogsothoth carteri

Yogsothoth carteri, after Shishkin and Zlatogursky, 2018 Yogsothoth carteri Shishkin and Zlatogursky, 2018 Diagnosis: Individual cells in a colony have a diameter of 9.7-15.2 µm;

Read More »