world of amoeboid organisms

Menu
Trichamoeba myakka
Polychaos dubium, with abnormal nucleus

In the early spring of 2015 I found numerous specimens of Polychaos dubium. They all had a normal nucleus. Some weeks after, both the amoebae in the samples as and in the wild showed an enlarged nucleus, irregular of shape, granulated en with some larger more or less homogeneous pieces. This might be caused by a parasite.

Polychaos dubium
Polychaos dubium
Normal nucleus, 29 µm, and abnormal nucleus, c. 43 µm
Polychaos dubium
Polychaos dubium with large nucleus (for detail see below)
Polychaos dubium
Polychaos dubium
Nucleus, c. 43 µm in diameter; to the left of the nucleus is the contractile vacuole
Polychaos dubium
Polychaos dubium
Polychaos dubium
n = nucleus
Polychaos dubium
Polychaos dubium
Trophozoit and its nucleus, c. 58 µm in diameter, somewhat compressed by the cover glass.
Recent posts

Cyclopyxis kahli oblonga

C. kahli f. oblonga , after Tarnogradskii, 1959 Cyclopyxis kahli f. oblonga  (Tarnogradskii, 1959) Centropyxis kahli f. oblonga Tarnogradskii, 1959 Diagnosis:  Test with all the

Read More »

Cyclopyxis leclercqi

Cyclopyxis leclercqi – from Beyens and Chardez, 1986 Cyclopyxis leclercqi Beyens and Chardez, 1986 Diagnosis: Shell circular in apertural view, dorso-ventrally compressed with a swollen

Read More »

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 »