Children (21 direct children, 378 direct and indirect children):
Marstoniopsis
(tree size 8)
Akiyoshia
(tree size 5)
Emmericia
(tree size 36)
Rachipteron
(tree size 1)
Teratobaikalia
(tree size 3)
Baicaliinae
(tree size 12)
Amnicolinae
(tree size 292)
Emmericiinae
Luofuspira
Mesocochliopa
Mesopyrgium
Pachychiloides
Protamnicola
Pycnanema
Reesidella
Sagia
Stantonogyra
Subtilistriata
Triasamnicola
Trochispira
Yongkangia