Choanostoma
Protozoa | Ciliophora | Echiura | Haptorida | Didiniidae | Choanostoma
Choanotrema
Biota | Animalia | Platyhelminthes | Rhabditophora | Neodermata | Trematoda | Digenea | Plagiorchiida | Xiphidiata | Opecoeloidea | Opecoelidae | Hamacreadiinae | Choanotrema
|  | Minot, 1876 | Ehlers, 1985 | Ehlers, 1985 |  | Carus, 1863 | La Rue, 1957 | Olson, Cribb, Tkach, Bray & Littlewood, 2003 | Ozaki, 1925 | Ozaki, 1925 | Martin, Downie & Cribb, 2020 | Nitta & Tanaka, 2018