Choanostoma
Protozoa | Ciliophora | Echiura | Haptorida | Didiniidae | Choanostoma
Choanostomellia
Biota | Animalia | Annelida | Polychaeta | Echiura | Echiuroidea | Bonelliida | Bonelliidae | Choanostomellia
|  | Lamarck, 1802 [as Annelides] | Grube, 1850 | Sedgwick, 1898 |  |  | Lacaze-Duthiers, 1858 | Zenkevitch, 1964