SYNOPSIS. A survey of the genus Lagenophrys Stein, 1852 (Ciliata, Peritricha) on freshwater crayfish (Parastacidae) revealed a wide range of new species in Australia and New Zealand. Fourteen new species are described. L. seticola sp. nov. is close to L. vaginicola Stein. L. spinosa, L. bispinosa, L. latispinosa, L. communis, L. occlusa, L. lawrii, L. lingulata spp. nov. form one species group. L. willisi, L. rugosa, L. darwini, L. deserti, L. ditngogi and L. engaei spp. nov. form a second group distinguished by characters of the lorica, lorica mouth and macronucleus. Nenninger's classification of degree of specificity of commensal‐host relationship is applied to the whole genus and expanded in the light of the Australian material. The zoogeographic problems resulting from the specificity of Lagenophrys and the limited range of some of its hosts are indicated.
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John Richard Kane (1965) studied this question.
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