Anctus angiostomus (Wagner, 1827) is herein described anatomically, based o
n material collected at Queimadas, BA, caatinga habitat. This species is ch
aracterized by closed primary and secondary ureters; salivary glands distan
t from the buccal bulb; a poorly developed stomach; a characteristic mode o
f emergence of the gonad duct from the annexe glandular sac; very long sper
moviduct; a short oviduct and vagina; very long and slender penis and epiph
allus and a long flagellum with retractor muscle in the tip.