Cystoopsidae Skrjabin, 1923
A family of nematode parasites of freshwater fishes.
The family is characterized by the presence of two stichosomes and an atrophied anus.or anus absent.
Intestine modified as a sac or trophosome.
Vulva located anteriorly in the body, anterior to nerve ring.
Eggs with membranous envelope or polar filaments.
Adults with pronounced sexual dimorphism: male body cylindrical.; female body with thread-like anterior region and globular posterior region.
Anterior part of body with transverse rings of numerous minute cuticular tubercles.
Anderson, R.C., Bain. O. 2009. Keys to the Nematode Parasites of Vertebrates. CABI
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