After detailed examinations of the male lectotype of Diplura erlandi (Tullgren, 1905) the type species of Achetopus Tullgren, 1905 and comparisons with the earlier descriptions of this species, it is certain that the vial does not exclusively contain disarticulated components of a single specimen. It was not possible to identify the components separately so that the extraneous ones could be removed. The designation of a neotype is desirable. Notes on the use and distinction of scopula, entire scopula and divided scopula are included.