Internal classification Oryzomyini

weksler s analyses suggested oryzomyines fall 4 major clades, largely congruent across analyses of morphology , irbp, support of limited , placement of genera remained unclear. dubbed these clades clade through clade d . analyses supported relationship between clades c , d, in turn related clade b, clade @ basal position, other analyses not resolve relationships among major clades. 4 clades follows:

clade includes scolomys , zygodontomys, support relationship between morphologically , ecologically dissimilar genera not strong.
clade b includes @ least oecomys, handleyomys, euryoryzomys, transandinomys, hylaeamys, , nephelomys, latter 4 of included in oryzomys until 2006. amphinectomys , mindomys recovered in clade in analyses, former, morphological characters unknown, more related nectomys within clade d , relations of latter, poorly known yet unique animal, obscure analyses suggest basal member of oryzomyini. there little support intergeneric relationships within clade.
clade c includes oligoryzomys, neacomys, microryzomys, , oreoryzomys, placed in oryzomys until 2006. no intergeneric relationships within clade received substantial support.
clade d includes drymoreomys, eremoryzomys, cerradomys, sooretamys, oryzomys, lundomys, pseudoryzomys, holochilus, aegialomys, nesoryzomys, melanomys, sigmodontomys, nectomys, amphinectomys, , extinct megalomys, agathaeromys, , pennatomys. eremoryzomys, cerradomys, sooretamys, , aegialomys included in oryzomys before 2006. there support basal placement of eremoryzomys within clade , 2 major groups of related genera, 1 including holochilus, lundomys, , pseudoryzomys , other nectomys, amphinectomys, sigmodontomys, melanomys, aegialomys, , nesoryzomys, extinct megalomys , pennatomys. holochilus–lundomys–pseudoryzomys group includes extinct noronhomys , carletonomys. oryzomys may closest relative, possible arrangement result of convergent development of adaptations life in water in 2 groups. within group of nectomys , related genera, there support core group excludes aegialomys , nesoryzomys , 2 subclades within core group, 1 including nectomys , amphinectomys , other melanomys , sigmodontomys.

the affinities of species remain unclear. many oryzomyines known lesser antilles, including ekbletomys hypenemus , species of megalomys , oligoryzomys, remain undescribed.