Microworld

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

Actinosphaeridium spec.

Actinosphaeridium spec. Actinosphaeridium spec. Diagnosis: Cell surrounded by a kind of membranous shell. Filopodia with granules, sometimes branching. Cell not stalked, at least not observed.

Read More »

Euglyphidion

Euglyphidion enigmaticum – after Bonnet, 1960 Genus Euglyphidion Bonnet, 196 Diagnosis: Shell hyaline, ovoid, pseudostome circular or slightly elliptical. Shell loosely covered with two types of

Read More »

Leptomyxa spec.

Leptomyxa sp., slowly retracting in response to the light of the microscope Leptomyxa sp. Diagnose: This is a very large amoeba which I found in

Read More »

Zivkovicia spec.

Zivkovicia spec., 200 µm long; the right image is viewed through the aperture Zivkovicia spec.  Diagnosis: Shell pyriform, circular in oral view, with a clear

Read More »

Pontigulasia pentangulostoma

P. pentangulostoma, after Quin et al., 2008 Pontigulasia pentangulostoma Quin et al., 2008 Diagnosis: Shell is brown, laterally uncompressed, parted to neck and body regions

Read More »

Flabellula citata

Flabellula citata, from Dykova et al., 2008 Flabellula citata Schaeffer, 1926 Diagnosis: Length in locomotion 15-75 µm; width 25-55 µm. Shape very variable, from a

Read More »