Lesser Margaretamys has reddish-brown fur and a dark facial marking, and has been recorded in the mountains of central Sulawesi.
The paper describes M. parvus as having soft, dense reddish-brown fur and a dark facial marking.
Musser’s field records describe it as nocturnal and report captures both on the ground and 1.5–5 m above ground in the understory of Mount Nokilalaki. Captive animals ate fruit and invertebrates, especially insects.
An extinction-risk assessment has not been added yet.