Reproduction and life-cycle Larger species 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. But this kind of extreme regeneration is restricted to only a few types of nemerteans, and is assumed to be a derived feature.A phylum-wide survey reveals multiple independent gains of head regeneration in Nemertea All reproduce sexually, and most species are gonochoric (the sexes are separate), but all the freshwater forms are hermaphroditic.
Reproduction and life-cycle Larger species 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. But this kind of extreme regeneration is restricted to only a few types of nemerteans, and is assumed to be a derived feature.A phylum-wide survey reveals multiple independent gains of head regeneration in Nemertea All reproduce sexually and most species are gonochoric (the sexes are separate), but all the freshwater forms are hermaphroditic