Cleptoparasitic: Hosts; The host in the Channel Islands is not known but N. similis is probably cleptoparasitic on Panurgus banksianus, as on the Continent (F.K. Stöckhert, 1933; Richards, 1979; Westrich, 1989; Celary, 1995). Associations summarised in Edwards & Else (2018) and Smit (2018)