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Caullery & Mesnil, 1919

Female a bilobed sac, with few distinct segments and lacking pereiopods. Male (cryptoniscus) antenna 1 with the basal article lamellar and often serrated, pereiopods 3 to 7 slender with setiform dactyls; pleopods and uropods biramous. Microniscus stage and its host unknown.
Initially infection takes place through the protandrous males, which attach to the gut of both males and females of the host. Further developement of the parasite only occurs if the host is female. One male developes as a female, it protrudes the head and anterior pleon into the brood pouch of the host. Infected host females lose their own eggs and the eggs of the parasite are visible through the host cuticle. Release of embryos is facilitated by a ventral split in the external part of the pereion of the parasite; epicardian larvae escape via the host brood pouch.

Parasitic on the sphaeromid isopod Dynamene bidentata .

A southern species.

Ancyroniscus bonnieri