world of amoeboid organisms

Menu
Choanocystis lepidula

Choanocystis lepidula (Penard, 1904) Siemensma & Roijackers, 1988

Diagnosis: Cell diameter 10-18 µm, periplast up to 23 µm; spine scales 7.1-9.5 µm long; shaft cylindrical, 0.22 µm thick and with an abruptly cut off apex; shaft curved proximally and seated at the apex of an invagination of the basal plate; basal plate 1.7-1.8 µm in diameter and surrounded by an upwardly bent rim, ca. 0.1 µm thick; basal plate extends for a short distance along the shaft; plate scales 4.2-5.2 x 2.3 µm, ovoid to oblong, with a central depression, ornamented with irregularly distributed granules and with a narrow longitudinal rib.

Remarks: I have seen many proximally curved spine scales, but also many more or less straight shafts were observed. Therefore, it is likely that not all specimens have the typical habitat as shown by Penard’s (1904) single figure. Two related species are Choanocystis perpusilla and C. rotundata. The first differs from C. lepidula in having two teeth on its apex. The plate-scales of C. rotundata are smooth, whereas those of C. lepidula have a longitudinal rib.

Choanocystis lepidula
Choanocystis lepidula, with the typical proximally curved spine-scales arranged around the axopodia – Laegieskamp.
Choanocystis lepidula
Choanocystis cf. lepidula
Recent posts

Haplomyxa saranae

Haplomyxa saranae Dellinger, 2014 Diagnosis: cell body from small rounded (0.1 mm) to large elongated shape (up to 3.5 x 0.3 mm), usually flat but

Read More »

Haplomyxa spec.

Main cell body Haplomyxa spec. Description: The cell has a central body from which numerous granuloreticulopodia emerge. The cell body can be small or large,

Read More »

Haplomyxa spec.

Haplomyxa spec. These video’s show an undescribed Haplomyxa species which was collected from a mesotrophic freshwater pond in the Netherlands, January 2020, and kept in Petri

Read More »

Chlamydophrys-schaudinn

Fritz Schaudinn (1871 – 1906) was a German zoologist. He was the co-discoverer of the causative agent of syphilis and did research on amoebas, particularly

Read More »

Alabasta longicollis

Alabasta longicollis, after Penard, 1890 Alabasta longicollis  (Penard, 1890) Diagnosis: Test pyriform, very elongated (3 times as long as wide), transparent, very little compressed, embedded

Read More »

Alabasta kivuense

Alabasta kivuense, after Gauthier-Lièvre and Thomas, 1961 Alabasta kivuense  Gauthier-Lièvre and Thomas, 1961 Diagnosis: In frontal view, the test is finger-shaped with subparallel sides, the

Read More »