Classification
In 2013, a robust muroid phylogeny found Delanymys sister to Mystromys + Petromyscus, reviving the affinity of Delanymys to petromyscines, in addition to Mystromys (Mystromyinae). Conventionally, all three genera have been placed in their own subfamily; a scheme that creates redundant, non-informative monogeneric subfamilies with respect to extant taxa.
More broadly, the clade Delanymys belongs to (Delanymys + (Mystromys + Petromyscus)) was sister to Dendromurinae (Steatomys + (Dendromus + Malacothrix)) and Cricetomyinae (Saccostomus + (Beamys + Cricetomys)).