Microworld

world of amoeboid organisms

Menu
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

Organic-walled species

Specimen with an optical cross-section of the peduncle (left) Organic-walled species Diagnosis: Multinucleated organic-walled monothalamous foraminifera. Test spherical to oval shaped, with a hyaline, flexible,

Read More »

Velamentofex tyrolensis

V. tyrolensis, two specimens Velamentofex tyrolensis Völcker and Clauß, 2020 April 2022, I found two specimens in a sample from the pond in Crailoo, Netherlands. I could

Read More »

Raphidiophrys spec. nov.

Raphidiophrys n. sp. Raphidiophrys n. sp. Diagnosis: Plate-scales canoe-shaped, elongated, with tapering, rounded poles, slightly curved upwardly. Light microscopically, these plate-scales show a clear rim;

Read More »

Lacogromia spec. Naardermeer

Lacogromia sp., Naardermeer, the Netherlands, 2022 (n=nucleus) Lacogromia sp. Six living specimens were found in an old sediment sample from a freshwater ditch in nature

Read More »

Sphenoderia rhombophora

S. rhombophora , after Bonnet, 1966 Sphenoderia rhombophora Bonnet, 1966 Diagnosis: Test hyaline, ellipsoidal, very slightly compressed. Fundus relatively narrow. Pseudostome largely truncated. Neck very

Read More »

Sphenoderia ovoidea

S. ovoidea , after Jung, 1942 Sphenoderia ovoidea Jung, 1942 Diagnosis: Shell with four layers of plate-scales. Distinguished from S. fissirostris by the ovoid tapering

Read More »

Sphenoderia truncata

S. truncata , after Van Oye, 1949 Sphenoderia truncata Van Oye, 1949 Diagnosis: Shell smooth and diaphanous, with usually pentagonal, sometimes hexagonal, inconspicuous plates. The

Read More »

Nebela gimlii

N. gimlii, from Singer and Lara, 2015 Nebela gimlii Singer and Lara, 2015 Diagnosis: Test wide pyriform or drop-shaped, laterally compressed, with a protruding narrow

Read More »

Sphenoderia, with granules

Overview Sphenoderia S. compressa S. fissirostris S. labiata S. lenta S. macrolepis S. minuta S. ovoidea S. rhombophora S. sphaerica S. splendida S. truncata

Read More »

Nebela overview

Nebela overview N. acolla N. aliciae N. aliciae N. barbata N. bohemica N. carinatella N. collaris N. flabellulum N. gimlii N. golemanskyi N. nebeloides N.

Read More »