Adults are  across and similarly tall, and are coloured blue to blue-grey. Mictyris platycheles gets its food by picking up balls of sands and putting it in its mouth, which filters out the food particles (detritus).
Mictyris platycheles, like other adults, shares comparable dimensions and exhibits a range of colors from blue to blue-grey. The species acquires food by collecting sand clumps and using its mouth as a filter to separate the edible particles.