C. elegans wild isolate. Isolated in Merlet, Lagorce (Ardche), France on September 8, 2002. Snails resembling Helix, under a tree full of ivy.

Reference: Lundquist and Herman 1994 Genetics 138: 83.

Mesorhabditis okuensis wild isolate. Male-female strain: maintain by crossing. Typically very few males on plates (only 10%); might be necessary to transfer large chunks to the new plates to ensure enough males are transferred. This species displays a striking reproductive system (described in Grosmaire & al. Science 2019. doi: 10.1126/science.aau0099).