They are a uniform light to dark brown color with a broad oval shape.

Juveniles display a serrated posterior edge of the carapace this may persist into so adults but begin to smooth.

Have a prominent shield on dorsal surface of the head extending posterior toward but not touching the tympanum.

[9] M. bellii occurs in the upper reaches of the Namoi, Gwydir,[1] Macdonald,[5]: 328  and Severn rivers in northern New South Wales, Australia.

[10][page needed] A disjunct population occurs in Bald Rock Creek, in southeast Queensland.