Earl, P.R., 1971. Hegneriella dobelli gen. n., sp. n., (Opalinidae) from Bufo valliceps and some remarks on the systematic position of the Opalinidae. Acta Protozool. 9 (3), 1 Aug 1971: 41-47. ≡
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Earl, P.R., 1972. Synopsis of the Plagiotomoidea, new superfamily (Protozoa). Acta Protozool. 9: 247-261.
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