The Ruby-throated Myzomela lives in forests on New Guinea and nearby islands. Males have an iridescent red throat patch, and the species mainly feeds on nectar.
Males are dark brown with a red chin-and-throat patch and sometimes a faint red forehead spot. Females are smaller and duller, often with a reddish-brown rump.
It uses primary and tall secondary rainforest, regrowth, and forest edges. It forages mainly in the upper canopy for nectar and insects, also eating figs; flowering sago is one recorded feeding site.
An extinction-risk assessment has not been added yet.