Tenuisentidae
Introduction '''Tenuisentidae''' is a family of parasitic spiny-headed (or thorny-headed) worms. The family contains two genera, each with one species.
Description and taxonomy
Species There are two genera, each with a single species. '''''Paratenuisentis''''' Bullock and Samuel, 1975* '''''Paratenuisentis ambiguus''''' (Van Cleave, 1921)''P. ambiguus'' infects the European eel (''Anguilla anguilla''). '''''Tenuisentis''''' Van Cleave, 1936* '''''Tenuisentis niloticus''''' (Meyer, 1932)''T. niloticus'' was found infecting the small intestine of the African arowana (''Heterotis niloticus''). The species name ''niloticus'' derives from the species name of the host fish, also ''niloticus''. It has also been found in the Egyptian Nile and River Sourou at Di, Sourou Province, Burkina Faso, Sudan and Mali. It has also been found in the electric catfish (''Malapterurus electricus'') in Lekki Lagoon, Lagos, Nigeria. The proboscis contains 16 (rarely 15) rows of hooks, each with 30–33 hooks with the average hook length per row being 1,105 um in the female and 993 um in the male. The hooks are not symmetrical in robustness dorso-ventrally but does contain similar length angles of curvature. The ventral hooks were considerably larger and more recurved than the dorsal hooks. The males have cement glands between 6.62 and 6.92 mm long. There are 86–146 nuclei.
Hosts Worms of the ''Tenuisentidae'' family exclusively parasitize fish.File:Anguilla anguilla.jpg|alt=European eel swimming on river bed|The European eel is a host of ''P. ambiguus''File:Heterotis niloticus MHNT ICHT 1995 69.jpg|alt=Preserved African arowana on a white background|The African arowana is a host of ''T. niloticus''
Notes
References