Caenorhabditis monodelphis is a species of nematodes in the genus Caenorhabditis. It was first collected by J. Raschka in Berlin, Germany in 2001. A second isolate was collected from Norway.[1] It is a free-living species found in galleries inside of the fungus Ganoderma applanatum (Polyporaceae) which grew on the stump of a tree a few centimeters above ground.[2] It is phoretic on beetles of the species Cis castaneus.
C. monodelphis (C. sp. 1) groups with Caenorhabditis plicata outside either the 'Drosophilae' or the 'Elegans' supergroups in phylogenetic studies.[3] Its genome was sequenced by the Edinburgh Genomics Facility, University of Edinburgh.
Several strains are known and kept in labs. Strain SB341 can be maintained on OP50 E. coli plates.