Other than cataclysm, asymmetrical attack, or government gone wild, we have little to worry about.
The larva is curiously asymmetrical, as many as fourteen gill-clefts appearing in an unpaired series on the right side, while the mouth is a large orifice on the left side, the anus being median.
Asymmetrical, inequivalve, fixed, with extensive pallial sutures; no siphons.
In many owls the right and left ears are asymmetrical, and this asymmetry affects the whole of the temporal region, all the bones which surround the outer and middle ear, notably the squamosal and the quadrate, so that the skull becomes lopsided, one ear being turned obliquely down, the other upwards.
A curious and interesting modification of the indirect method, known as " asymmetrical division," occurs frequently in epitheliomata, sarcomata, &c. (Hansemann).