Isancistrum is a genus of monogeneans in the family Gyrodactylidae. Unlike most monogeneans which are parasitic on fish or other vertebrates, species of Isancistrum are parasitic on squids (molluscs).

Species Isancistrum loliginis de Beauchamp, 1912 Isancistrum subulatae Llewellyn, 1984Llewellyn, J. (1984). The biology of Isancistrum subulatae n. sp., a monogenean parasitic on the squid, Alloteuthis subulata, at Plymouth. Journal of the Marine Biological Association of the United Kingdom, 64(2), 285–302.

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