Red-backed Mannikin is currently placed as Spermestes nigriceps. It has a black head and chest, chestnut back, and white central belly. A Tanzanian park checklist records it in woodland, forest wetlands, and edges, where it keeps moving.
Cassin's description gives a black head and chest, chestnut back and wing coverts, and a white center to the belly.
A checklist from Arusha National Park, Tanzania, records it in woodland, tall-grass swamps within forest, forest edges, and clearings, and describes it as constantly moving.
An extinction-risk assessment has not been added yet.