[2] Mamaev (1967) established a new genus Metapseudaxine for monogeneans similar to Sibitrema.

Although the prohaptor is not the primary attachment organ, it is used to anchor the body of the parasite while the opisthaptor is being repositioned.

Located at the anterior part of the worm is the funnel-shaped mouth that is connected to the pharynx which is larger than the buccal suckers, followed by the long wide oesophagus esophagus that is smaller in diameter compared to the pharynx.

Each worm has reproductive organs such as vas deferens, testis, uterus, vitelline duct, ovary, and vitellaria.

A short duct that opens to the outside on the dorsal surface is composed of four canals on each side, two posterior and two anterior, that come together laterally to the cirrus.