The most problematic group in terms of identificationand distinguishing true parasites from non-trophicassociates are the rhabditidae. While two species ofPhasmarhabditis (P. hermaphrodita and P. neopapillosa)are clearly true parasites of some slugspecies, there are many rhabditid nematodes associatedwith terrestrial molluscs either phoretically (i.e. fortransport) or necromenically (an association in which
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