Leptomyxa ambigua
Leptomyxa ambigua, after Smirnov, 2017

Leptomyxa ambigua Smirnov et al. 2017

Diagnose: Limax-shaped amoebae are remarkably clavate in locomotion, frontal hyaline area occupies up to half of the cell. Length in locomotion 50–156 µm. The most of cells are uninucleate, but up to four nuclei are possible. Cyst single-walled, 27–50 µm in diameter usually uninucleate, some cysts have 2–4 nuclei, very rarely more. The nucleolus of the trophozoite contains numerous patches of electron-dense material, 1–2 µm across, each patch with small central lacuna.

Ecology: Leaf litter in Wandlebury Wood, Cambridgeshire, UK.

Remarks: Differs from all studied species of Leptomyxa and Rhizamoeba by the presence of characteristic patches of electron-dense material in the nucleolus. Resembles L. flabellata Goodey, 1915 but differs from this species by the cyst structure (single-walled). Resembles L. australiensis (Chakraborty et Pussard, 1985) Smirnov et al., 2017 and L. valladaresi De Obeso Fernandez Del Valle, Lorenzo-Moralez et Maciver, 2017 but differs from both these species by the locomotive morphology (clavate cells with large anterior area of the hyaloplasm versus oblong cells, vermiform or narrow-ing to the anterior end) and rarity of flattened, expanded and branched forms in cultures.

Recent posts

Centropyxis declivistoma

Centropyxis declivistoma, after Chardez, 1990 Centropyxis declivistoma Chardez, 1990 Diagnosis: Test ovoid, slightly compressed dorso-ventrally, especially in the anterior region, embedded with polymorph mineral platelets. Pseudostome

Read More »

Plagiopyxis bicamera

Plagiopyxis bicamera, after Coûteaux, 1978 Plagiopyxis bicamera Coûteaux, 1978 Diagnosis: Test elongated, in ventral view elliptical, dorso-ventrally compressed, colorless or yellowish, with a cryptostome with visor.

Read More »

Arcella jurassica

Arcella jurassica, after Olivier, 1944 Arcella jurassica Olivier, 1944 Diagnosis: Test pyramid-shaped but strongly truncated, in lateral view trapezium-shaped, with 5-8 planes; pseudostome surrounded by

Read More »

Assulina discoides

Assulina discoides , after Bobrov, Shimano and Mazei, 2012 Genus Deharvengia Bobrov, Shimano and Mazei, 2012 Diagnosis: Shell large in size, disc shaped, colorless, transparent,

Read More »

Deharvengia

Deharvengia japonica, after Bobrov, Shimano and Mazei, 2012 Genus Deharvengia Bonnet, 1979, emend. Bobrov, Shimano and Mazei, 2012 Diagnosis: Test transparent, oval or ovoid in

Read More »