Megascolecidae some Pheretima (class Clitellata) is falsely believed to be thinly distributed around the tropics and have the typical "megascolecine" arrangement of male pores.
Clitellata Members of the Pheretima group of genera (e.g. Amynthas) are widely distributed around the tropics, much as some Lumbricidae are distributed through the temperate zones. The members of this family have the typical "megascolecine" arrangement of male pores, with vasa deferentia and prostatic ducts uniting before opening via a combined pore on segment 18, rather than the "acanthodriline" arrangement (with male pores and pores from one or more pairs of prostates opening separately near segment 18, but never combined on segment 18) as found in the related families Acanthodrilidae, Octochaetidae and Exxidae. 
