M. melitensis has been diagnosed from M. olivoidea basing on larger apical size and an allegedly different coloration (Mifsud 2001). Actually, the lectotype of M. olivoidea has a tawny-brown background color, with lighter and darker medial blotches, and a marked decoloration in correspondence with the anal sinus, definitely not distinguishable from M. melitensis (Fig. 8C, D). The apical measures reported by Mifsud were incorrectly derived, and were subsequently corrected after using a more standard method: mean Do = 0.44 mm, mean DM = 0.57 mm. These mean values fall within the known range of M. olivoidea (Do 0.40–0.44 mm, DM 0.55–0.60 mm). The holotype of M. melitensis is a little more slender than the lectotype of M. olivoidea (H/W 2.227 v. 2.085) and shows a less evident sculpture on the periphery, a variation observed within most species of Mitromorpha.