The Janya (“Janes”, pejoratively) are the civilized folk of the Solar System. They possess art, culture, science, as well as a supernatural rapport with vastly powerful beings of energy (which is the basis of their theosophy). They have spread throughout the system, colonizing as they go. An immigrant species, the Janya are not, in fact, native to Mitra.
At the physiological level, there are several different genetic expressions on Janya heredity. All are essentially interfertile with each other, although offspring are always of one of the existing castes (there are no hybrid or partial caste Janya).