How do spiny mice in the subgenus Pyromys differ from other species of Mus?

Species in the subgenus Pyromys are distinguished from other members of the genus Mus primarily by their unique fur texture. While other species of Mus typically possess soft or slightly coarse coats, Pyromys species are characterized by upperparts and undersides covered in flat, channeled spines that are nestled within a soft underfur. It is important to note that these spines are not present in juveniles.1

These five species are native to India, Sri Lanka, and mainland Southeast Asia, where they primarily inhabit open grasslands or grassy patches within forests.1

Please note that the term "spiny mouse" is also commonly used to refer to rodents of the genus Acomys, which are distinct from the Mus genus.2