It is most of all known in certain animals as nematodes C. elegans, or ascidians (marine animals).
For instance, infections of nematodes or of arthropods, including Drosophila, species of the rickettsial bacteria Wolbachia can produce a male-specific sterility, which is congenital by means of transmission through the female line.
Heterorhabditis nematodes are hosts for the Photorhabdus bacterial symbiont.
In 2001, rootstock from the Coffea liberica species was found to be resistant to the nematodes.
Visceral larva migrans, a condition in children caused by the migratory larvae of nematodes
volvulus, along with most filarial nematodes, share an endosymbiotic relationship with the bacterium Wolbachia.
The forcible discharge mechanism of Pilobolus is exploited by parasitic nematodes including lungworms in the genus Dictyocaulus.
Lesion nematodes are migratory endoparasites that feed and reproduce in the root and move around, unlike the cyst or root-knot nematodes, which may stay in one place.
Preceded by induced changes in eggshell permeability, hatching may involve physical and/or enzymatic processes in plant-parasitic nematodes.
Schistonchus laevigatus and Schistonchus aureus are plant-parasitic nematodes associated with the pollinator Pegoscapus assuetus and Pegoscapus mexicanus respectively and syconia of Ficus citrifolia and Ficus aurea respectively.
To protect against infection by nematodes of the genus Anisakis, European Union regulations state that fish should be frozen at −20 °C for at least 24 hours.
A 2006 study, published in the journal Applied and Environmental Microbiology, found the king stropharia to have the ability to attack the nematode Panagrellus redivivus; the fungus produces unique spiny cells called acanthocytes which are able to immobilise and digest the nematodes.