world of amoeboid organisms

Menu
Lecythium hyalinum
Lecythium hyalinum
Lecythium hyalinum, 44 µm

Genus Lecythium Hertwig & lesser, 1874 emend. Dumack et al., 2016

Diagnosis: Filose, radially symmetric amoebae. Cells bear a colourless, thin and organic test (theca), carried in an upright position, with one basal opening from which branching and anastomosing filopodia arise. Filopodia may show small granules. Nucleus at the apical end of the cell. Cells with numerous contractile vacuoles and granules. Might form floating or swimming stages (single cells and aggregates) with straight, non-branched and non-anastomosing filopodia. Aggregates with fused filopodia or fused vacuolated cytoplasm occur. Cysts are built within the theca that then remains as a loose envelope around the cyst wall. No flagellated cells observed. Species feed on eukaryotic prey (i.e. algae); ingestion of bacteria not observed. Division: longitudinal, binary. Sexual reproduction unknown.

Type species: L. hyalinum

Dimensions: mostly small species.

Ecology: common in different types of water; feeding on algae and bacteria.

Remarks: Nucleus and pseudostome are difficult to observe, the latter is usually a small hole between folds.

Lecythium hyalinum
Lecythium hyalinum, with lamellipodia, branching and anastomosing filopodia
Recent posts

Polychaos spec.

Polychaos spec. Polychaos spec. Diagnosis: Large amoeba with an irregular more or less polypodial shape during slow locomotion; uroid finely papillated, usually very large fasciculate

Read More »

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 »