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

Difflugia bicruris

Difflugia bicruris, after Gauthier-Lièvre et Thomas, 1958 Difflugia bicruris  Gauthier-Lièvre et Thomas, 1958 Diagnosis: Test elongate ovoid, in cross section circular, with almost parallel sides;

Read More »

Difflugia congolensis

Difflugia congolensis, after Gauthier-Lièvre et Thomas, 1958 Difflugia congolensis  Gauthier-Lièvre et Thomas, 1958 Diagnosis: Test elongate pyriform, acuminate, with a spine of variable size and

Read More »

Difflugia key ovoid

Difflugia Ovoid Group Key characters: Test ovoid, in cross section rounded. Pseudostome circular. 1 Test with collar or short neck 2 1′ Test without collar

Read More »