Nasobranchitrema  Nasobranchitrema is a genus of monopisthocotylean monogeneans, belonging to the family Diplectanidae. The position of "Nasobranchitrema" within the family Diplectanidae is a matter of controversy. Oliver considered that the absence of squamodisc and adhesive plate in the haptor and the position of the ovary made the genus closer to the Ancyrocephalidae than to the Diplectanidae. According to the World Register of Marine Species, there is a single species in the genus "Nasobranchitrema":  "Nasobranchitrema pacificum" is a parasite on the gills of unicorn fishes (family Acanthuridae), "Naso hexacanthus" (type host), "Naso lituratus", and "Naso brevirostris", all from off Hawaii.