world of amoeboid organisms


Genus Wobo Hülsmann, 1986, 2006

Diagnosis: Large plasmodia with hundreds or thousands of small nuclei involved in bidirectional streaming, but plasmodium represented by singular strand. Obligatory alternation of sessile and motile stages. Locomotion by migration via one or several giant pseudopodia with pre-dominantly unidirectional centrifugal streaming of protoplasm. Cyst formation. Tectum as (protective) covering but reduced considerably. Occasional formation of protoplasmic propagules (blisters, blebs) from pseudopodia and central areas. Strictly bipolar, normally with two pseudostomes at ends of vermiform tectum. Cleansing process before migration phase greatly reduced. Excretion of waste material only at base of leading pseudopodia (outside tectum).
One species: Wobo gigas Hülsmann, 1986, 2006.

Ecology: Fresh water. Predatory.


This video was made by Norbert Hülsmann and shows motility, food intake and reproduction of Wobo gigas.

Description: Wobo gigas is a protist of the Reticulomyxidae family which can be several millimetres long and is enclosed in thin flexible hull (tectum). A pseudopodium emerges through a pseudo stoma-like opening, branches and forms a reticular net work. Here nutrient particles are taken up by phagocytosis, transported to the central area and non-digested residues removed through the opening. Movement is a migration stream which can divide, synonymous with asexual reproduction.

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