Review of "Keys to the Trematoda. Vol. 3" by Rodney A. Bray, David I. Gibson and Arlene Jones (eds.)

The volume includes five superfamilies of the Order Plagiorchiida (Gorgoderoidea Looss, 1899; Microphalloidea Ward, 1901; Monorchioidea Odhner, 1911; Opisthorchioidea Looss, 1899; and Plagiorchioidea Lühe, 1901) and the family Didymozoidae Monticelli, 1888 of the Order Strigeida which was omitted from Volume 1. As in the previous volumes, the core of the book (59 chapters covering 618 genera) provides taxonomic background which invariably represents top-class discussion based on extensive knowledge of the history of the group and of the literature, familial diagnoses, keys and diagnoses to the genera and subfamilies (where applicable). A further five chapters give short introductions and diagnoses of the superfamilies, and keys to families. Finally, the volume includes a linking key to all superfamilies of the Digenea with a reference to the volume of the series where treated in detail, and a separate chapter comprising diagnoses of 18 genera incertae sedis in the superfamily Plagiorchioidea (sensu lato), lists of digenean generic names (genera inquirenda, larval names and nomina nuda) not used in the three volumes of keys and a list of the new genera erected after the publication of the first two volumes of the series. The third volume thus provides completeness to this encyclopaedic work. The text is admirably referenced and remarkably free from typographical errors.