This species has been recorded a few times off Morocco and once off Mauritania; it may be extremely rare or mistaken for G. melastomus in the region. Its total range has been estimated to encompass , about evenly divided between the northeastern Atlantic and the western Mediterranean.
This species has been observed a few times off the coast of Morocco and once off Mauritania, but it may be extremely rare or mistaken for G. melastomus in the region. Its total range is thought to be roughly split equally between the northeastern Atlantic and the western Mediterranean.