Physical 

Ribbed mussels are bivalves that are dark brown to green in color, with well-defined ribs running laterally.

Habitat

M. demissus are abundant in marshes, where they live in groups that line marsh plant roots.  They are commonly found half submerged in mud, and thrive in brackish water with muddy flats nearby.

Feeding 

Ribbed Mussels are filter feeders that strain organic material out of the water column by means of a siphon system.