Monogenea

Monogenea (adj. monogenean) are a group of largely ectoparasitic members of the flatworm phylum Platyhelminthes. They are especially common on the skin, fins and gills of fishes and there are thousands of described and undescribed species. Less commonly, they can be found in the urinary bladder and rectum of cold-blooded vertebrates. None infect birds, but one (Oculotrema hippopotami) infects mammals, parasitizing the eye of a hippopotamus. They have direct life-cycles with no asexual reproduction (unlike the Digenea) and in those that lay eggs, a larval stage (generally ciliated) called an oncomiracidium that is responsible for transmission from host to host. As adults, they eat the blood, mucus, and epithelial cells of their host. Adults have both a prohaptor (for feeding) and an opisthaptor (for attachment). Some parasitologists divide Monogenea into two subclasses based on the number of haptors on their suckers: Monopisthocotylea have one haptor, while Polyopisthocotylea have multiple haptors. Monopistocotylea include: Both can cause epizootics in freshwater fish when raised in aquaculture. Polyopisthocotylea include:

 

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