Pachysentis
... that parasitic worms of genus Pachysentis have hooks on their heads and attach themselves to the intestine of the host?
... that parasitic worms of genus <i id="mwBb4"><b id="mwBb8"><a href="./Pachysentis" id="mwBcA" rel="mw:WikiLink" title="Pachysentis">Pachysentis</a></b></i> have hooks on their <a href="./Proboscis" id="mwBcE" rel="mw:WikiLink" title="Proboscis">heads</a> <i id="mwBcI">(example pictured)</i> and attach themselves to the intestine of the host?