[3] B. uncinus was found infesting the small intestines of the Tank goby (Glossogobius giuris) and Eleotris pisonis near the mouth of Keelung River, Taiwan.

The representatives of the genus are distributed in tropical waters of Indian Ocean, Pacific coast of Australia and Mediterranean.

Consists of five species:[9] T. exiguus is a widespread intestinal parasitic worm.

Its cerebral ganglion located in central part of the proboscis sac, sometime moved to anterior region.

[9] In the Black Sea the intermediate hosts of this acanthocephalan is the amphipod Apherusa bispinosa,[12] in the coelom of which the cystacanthes are located.