Sphaerastrum fockii (Archer, 18969) emend. Mikrjukov, 1996

Diagnosis: Cells 9-32 µm in diameter, average 22 µm, surrounded by a not always clearly visible thick mucus layer. Cytoplasm and mucus not or hardly separated from each other.  Numerous needle shaped spicules are tangentially or sub-tangentially oriented in the mucus layer, 30-40 µm long, of uniform thickness. Several contractile vacuoles present, sometimes bulging. Cells may form colonies by aggregating of 10-12 individuals connected by cytoplasmic bridges; mucus cover and spicules apply in this case on the entire colony.

Ecology: Freshwater. Between water plants. Distribution: Europe, South-America.

Recent posts

Ditrema spec.

Ditrema spec. Ditrema spec. Diagnosis: Shell as with D. longicollis, but much smaller, surrounded by V-shaped structures that gave it the impression of a star.

Read More »

Rotosphaerida

Pompholyxophrys Pompholyxophrys Pompholyxophrys Rabdiophrys Rotosphaerida Rainer, 1968 Diagnosis: Aciliate predominantly spherical or flattened amoebae from which elongated actin-based filopodia extend; with flat discoid mitochondrial cristae;

Read More »

Centropyxis tabel

Key to Centropyxis species 1 Test in dorsal view circular or almost circular 2 – Test in dorsal view irregular due to various outgrows and

Read More »