Cladius difformis (Panzer, 1799) is often considered as synonymous to
Cladius pectinicornis (Geoffroy 1785)
(1). While Dr. D.R. Smith maintains that the two are distinct species (with
C. pectinicornis being strictly Palaearctic and
C. difformis found in the Nearctic), subsequent literature has found no morphological nor genetic rationale to separate the two.