Agabus bipustulatus classification of secondary elytral reticulation after the total sample was screened for common patterns.

Seven categories (A-G) ranging from tightly packed longitudinally elongated meshes to more or less isomorphic meshes were recognised in Agabus bipustulatus. Type A is found in the bipustulatus and solieri forms, type B in kiesenwetterii, falcozi and dolomitanus, and type C, F and G in pyrenaeus. The categories D, E and F describe intermixed patterns.