  In this article, we prove that finite semidistributive lattices are
dismantlable if and only if they are planar. This extends a well-known result
by Kelly and Rival that states the same property for finite distributive
lattices. Moreover, we show how the breadth of finite semidistributive lattices
can be computed with the help of canonical join representations. We use this
result to conclude that the breadth of a finite semidistributive dismantlable
lattice cannot exceed $2$.
