- GeoRef, Copyright 2004, American Geological Institute. Reference includes data from Bibliography and Index of Geology Exclusive of North America, Geological Society of America, Boulder, CO, United States
On reexamination, the material used for describing the type species, Amplexograptus perexcavatus, has been found to contain two distinct forms, neither having a concavoconvex rhabdosome cross-section. Both are described, one as A. fallax n.sp. The genus is redescribed and compared with Climacograptus, and examples of borderline cases are cited.