Claim: Megalodacne reaches a maximum length of only 12 mm, Megalodacne are large beetles and are mostly found in Europe which is  entirely within the Northern Hemisphere.
Evidence: Adult beetles of the genus Megalodacne range in size from 9 to 22 millimetres (0.35 to 0.87 in), making them among the larger members of the family. 
They also often look superficially similar to several other beetles since the patterns of the markings of yellow, orange, or red on the elytra (called fascia) of Megalodacne are shared by many other beetle species. An example of which is the sap beetle (Nitidulidae) genus Glischrochilus. The best way to tell them apart is by size, as sap beetles are generally small, ranging from 2 to 12 mm (0.08 to 0.47 in) in length. Megalodacne on the other hand are large beetles ranging from 9 to 22 mm (0.35 to 0.87 in). Megalodacne varia (Gorham, 1889) – Malaysia Megalodacne similima (Crotch, 1876) – Sarawak, Sumatra Megalodacne promensis (Arrow, 1925) – Burma, China Megalodacne marginata (Arrow, 1925) – Assam Megalodacne immaculata (Chûjô and Kiuchi, 1963) – Japan Megalodacne heros (Say, 1823) – eastern North America Megalodacne grandis (Fabricius, 1792) - Africa Megalodacne grandipennis (Fairmaire, 1891) – Tanzania Megalodacne fasciata (Fabricius, 1777) – eastern North America Megalodacne elongatula (Crotch, 1876) – Southeast Asia Megalodacne chinensis (Crotch, 1876) – China Megalodacne bellula (Lewis, 1883) – Japan, Korea, & China Europe is a continent located entirely in the Northern Hemisphere and mostly in the Eastern Hemisphere.