|Reproduction Preferences Additional Information||Life span is only 4-5 months and there are three generations per year, each featuring a period of growth, reproduction and death (Hughes, 1977).
Planula larvae secrete a mucous thread which aids dispersal of the planula (Hughes, 1977) but which may also assist in getting caught in the tall branches of other Nemertesia antennina, thereby helping the species to form clumps (Gili & Hughes, 1995).
Disperal of planula is, therefore, dependant on current speeed, turbulence and height of release, e.g. Hughes (1977) suggested a potential dispersal range of 5 - 50m in Torbay, Devon.
Planulae also crawl (although probably no more than 2 m ) before settlement and it is possible that they attach to the substratum with mucous (Hughes, 1977).
Hughes (1977) reported three reproductive periods in colonies off Torbay. Regenerated individuals made up ca 16 % of the Torbay population but these individuals had fewer gonagia (Hughes, 1977).