Tetrameres numida n. sp. from the proventriculus of Helmeted guineafowls, Numida meleagris, in
South Africa is described from eight male and four female specimens. The new species shares some
characteristics with other Tetrameres species, but can be differentiated by a unique combination of
characters. It bears two rows of cuticular spines extending over the whole length of the body and possesses
two spicules. Diagnostic criteria of some of the previously described species of the genus Tetrameres from Africa
and other parts of the world have been compiled from the literature and are included here.