Children (69 direct children, 1107 direct and indirect children):
Opecoeloides
(tree size 19)
Opecoelus
(tree size 48)
Crowcrocaecum
(tree size 5)
Helicometra
(tree size 50)
Helicometrina
(tree size 16)
Genitocotyle
(tree size 5)
Pseudopecoeloides
(tree size 26)
Nicolla
(tree size 24)
Opegaster
(tree size 43)
Dactylostomum
(tree size 23)
Cainocreadium
(tree size 18)
Neohelicometra
(tree size 3)
Pseudopecoelus
(tree size 42)
Opecoelina
(tree size 7)
Hamacreadium
(tree size 19)
Plagioporus
(tree size 74)
Paropecoelus
(tree size 20)
Decemtestis
(tree size 32)
Neonotoporus
(tree size 13)
Neopecoelus
(tree size 2)
Neopodocotyloides
(tree size 3)
Alloanomalotrema
(tree size 2)
Nezpercella
(tree size 1)
Manteriella
(tree size 5)
Allostenoperca
(tree size 1)
Pycnadenoides
(tree size 7)
Opercoelus
(tree size 1)
Anomalotrema
(tree size 2)
Apopodocotyle
(tree size 3)
Ozaki
(tree size 1)
Pachycreadium
(tree size 6)
Stenoperca
(tree size 1)
Bathycreadium
(tree size 8)
Scorpidotrema
(tree size 1)
Neolebouria
(tree size 13)
Fairfaxia
(tree size 2)
Peracreadium
(tree size 13)
Coitocaecum
(tree size 47)
Tellervotrema
(tree size 3)
Allopodocotyle
(tree size 25)
Discoverytrema
(tree size 2)
Dactylomyza
(tree size 2)
Gaevskajatrema
(tree size 4)
Buticulotrema
(tree size 2)
Proneohelicometra
(tree size 1)
Podocotyloides
(tree size 15)
Diplobulbus
(tree size 7)
Pseudopycnadena
(tree size 2)
Macrourimegatrema
(tree size 2)
Poracanthium
(tree size 2)
Jerguillicola
(tree size 1)
Macvicaria
(tree size 54)
Stenakrinae
(tree size 48)
Plagioporinae
(tree size 203)
Opecoelinae
(tree size 25)
Helicometrinae
(tree size 1)
Anisoporus
(tree size 3)
Pseudosphaerostomum
(tree size 1)
Sphaerostomum
(tree size 5)
Bathycreadiinae
Opecoelininae
(tree size 2)
Opistholebetinae
(tree size 5)
Podocotylinae
(tree size 5)
Polypipapiliotrematinae
(tree size 6)
Stenakrinae
Abyssopedunculus
(tree size 1)
Mesobathylebouria
(tree size 5)
Hamacreadiinae
Pseudoplagioporinae