Most of the ribbon worms or Nemertea reproduce sexually.
Larger often break up when stimulated and the fragments often grow into full individuals. Some species fragment routinely and even parts near the tail can grow full bodies. All reproduce sexually and most species are gonochoric (the sexes are separate) but all the freshwater forms are hermaphroditic.
http://en.wikipedia.org/wiki/NemerteaReproduction_and_life_cyclehttp://www.earthlife.net/inverts/nemertea.htmlhttp://science.jrank.org/pages/5869/Ribbon-Worms.html
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