F in A new gigantic earthworm of the genus Metaphire Sims and Easton (Megascolecidae: Oligochaeta) from Taiwan with reference to evolutional trends in body sizes and segment numbers of the Pheretima genus-group

F. 2. Body length frequency distribution of caecate (Amynthas, Metaphire, Pheretima) and acaecate (Archipheretima, Metapheretima, Polypheretima, Planapheretima) earthworms from Japan, Korea, China, Taiwan and South-East Asia (total number of species in parenthesis following average±standard deviation).