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After Parker, 1982
<==o OPISTHORCHIIDA |--o OPISTHORCHIATA | `--o OPISTHORCHIOIDEA | |-- Opisthorchiidae | |-- Heterophyidae | |-- Cryptogonimidae | |-- Acanthostomatidae | |-- Pachytrematidae | |-- Ratziidae | `-- Tetracladiidae `--o ACANTHOCOLPIATA `--o ACANTHOCOLPIOIDEA |-- Acanthocolpidae |-- Campulidae `-- Nasitrematidae
Parker, S. P. (ed.), 1982: Synopsis and classification of living organisms. Vols. 1 & 2
–McGrew-Hill Book Company
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