Theristus sp.

In the fifties of the previous century, Schuurmans-Stekhoven wrote: there are worms and worms. Regarding nematodes, based on habitat and classification, two groups can be distinguished. On the one hand there is a large group of marine nematodes and on the other hand the group which lives in freshwater and soil. Some inland species invaded the marine environment, other species of marine genera invaded freshwater. The genus Theristus is of marine origin but some species are frequently found in freshwater. It are relatively large nematodes which probably feed on unicellular organisms. Identification of Theristus species is almost impossible due to the lack of good descriptions and identification keys.

More pictures of Theristus:

Theristus
Theristus

Theristus: amphids
Theristus: amphids

Theristus: lip region
Theristus: lip region

Theristus: oral cavity
Theristus: oral cavity

Theristus: setae, amphids
Theristus: setae, amphids

Theristus: setae
Theristus: setae

Theristus: base of oesophagus
Theristus: base of oesophagus

Theristus: spicules
Theristus: spicules

Theristus: spicules
Theristus: spicules

Theristus: spicula
Theristus: spicula

Theristus: tail region
Theristus: tail region

More pictures of Theristus agilis:

Theristus agilis
Theristus agilis

Theristus agilis: oral cavity
Theristus agilis: oral cavity
Theristus agilis: amphid and setae
Theristus agilis: amphid and setae
Theristus agilis: oesophagus
Theristus agilis: oesophagus
Theristus agilis: anal opening
Theristus agilis: anal opening
Theristus agilis: vulva
Theristus agilis: vulva
Theristus agilis: tail
Theristus agilis: tail

(Click on the pictures for an enlargement, © Laboratory of Nematology/Pictures: Hanny van Megen)