Frederick Octavius Pickard-Cambridge was an English arachnologist. He is sometimes confused with his uncle, Octavius Pickard-Cambridge, who was also an arachnologist and from whom F. O. Pickard-Cambri

Ferdinand Anton Franz Karsch was a German arachnologist, entomologist and anthropologist. He also wrote on human and animal sexual diversity with his mother's maiden name included as Ferdinand Karsch-