Discolaimus

Although the cuticle and anterior end of  marine and freshwater nematodes are usually provided of setae and other appendices, terrestrial nematodes are usually devoid of such structures to facilitate movement between soil particles. However, the anterior end of Discolaimus is not rounded off. In Discolaimus, the anterior end is provided of a disc-shaped structure which is used to adhere to other soil organisms, including nematodes. Subsequently the nematode uses its spear to pierce the cuticle of its prey and to suck the content of the body. It is a remarkable nematode which is easily recognized; in the Netherlands it is quite common in dune sand.

More pictures of Discolaimus major:

Discolaimus major: head region
Discolaimus major: head region

Discolaimus major: tail region
Discolaimus major: tail region

Discolaimus major: amphid, lip with distinct papillae
Discolaimus major: amphid, lip with distinct papillae

Discolaimus major: amphid
Discolaimus major: amphid

Discolaimus major: disc-like lip region
Discolaimus major: disc-like lip region

Discolaimus major: papillae
Discolaimus major: papillae

Discolaimus major: odontostyle, lip region
Discolaimus major: odontostyle, lip region

Discolaimus major: odontostyle
Discolaimus major: odontostyle

Discolaimus major: odontostyle, guiding ring
Discolaimus major: odontostyle, guiding ring

Discolaimus major: spear extension
Discolaimus major: spear extension

Discolaimus major: oesophagus
Discolaimus major: oesophagus

Discolaimus major: vulva
Discolaimus major: vulva

Discolaimus major: tail and anal opening
Discolaimus major: tail and anal opening

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