Helicometrina elongata
Animalia | Platyhelminthes | Trematoda | Plagiorchiida | Opecoelidae | Helicometrina | Helicometrina elongata
Helicometrina nimia
Biota | Animalia | Platyhelminthes | Rhabditophora | Neodermata | Trematoda | Digenea | Plagiorchiida | Xiphidiata | Opecoeloidea | Opecoelidae | Helicometrinae | Helicometrina | Helicometrina nimia
|  | Minot, 1876 | Ehlers, 1985 | Ehlers, 1985 |  | Carus, 1863 | La Rue, 1957 | Olson, Cribb, Tkach, Bray & Littlewood, 2003 | Ozaki, 1925 | Ozaki, 1925 | Bray, Cribb, Littlewood & Waeschenbach, 2016 | Linton, 1910 | Linton, 1910