This tenrec occurs in humid forests of Madagascar. Its back is described as dark brown with a reddish wash, while the belly is dark gray tinged with buff. Captures have also been recorded in regenerating forest and eucalyptus plantations.
The 2018 book describes M. majori with a dark-brown back washed with reddish tones and a dark-gray underside tinged with buff. The tail is gray-brown above and buff below.
A research chapter published in 2022 reports two M. majori captured in savoka, a regenerating humid forest, and other individuals captured in introduced eucalyptus plantations.
An extinction-risk assessment has not been added yet.