Giganthorhynchidae
Introduction '''Gigantorhynchida''' is an order containing a single family, '''Gigantorhynchidae''' of parasitic worms that attach themselves to the intestinal wall of terrestrial vertebrates. '''Gigantorhynchida''' contains the following three genera:*''Gigantorhynchus'' Hamann, 1892:The genus ''Gigantorhynchus'' is characterized by the presence of a cylindrical proboscis with a crown of robust hooks at the apex followed by numerous small hooks on the rest of the proboscis. The body, or trunk, is long with pseudosegmentation, the lemnisci are filiform, and the testes are ellipsoid. Species of ''Gigantorhynchus'' are distinguished based on the number and size of hooks on the crown of the proboscis, the type of pseudosegmentation, and size of the ellipsoid eggs. Males of all species possess eight cement glands which are used to temporarily close the posterior end of the female after copulation. There is pronounced sexual dimorphism with the female often two or more times longer than the male. *''Intraproboscis'' Amin, Heckmann, Sist, and Basso, 2021:There is one species, ''Intraproboscis sanghae'' in this genus. It was found infesting the African black-bellied pangolin (''Phataginus tetradactyla'') in the  Central African Republic. *''Mediorhynchus'' Van Cleave, 1916
Taxonomy Phylogenetically, the family Gigantorhynchidae is sister to the family Moniliformidae, represented by sequences of ''Moniliformis Moniliformis'' that form a supported monophyletic group. The group formed by Gigantorhynchidae and Moniliformidae suggest it to be a sister to the group formed by sequences of ''Macracanthorhynchus ingens'' and ''Oncicola venezuelensis''
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