The present study re-examines the detailed morphology of the type-species, Diclidophora merlangi (Kuhn, in Nordmann, 1832) Kr6yer, 1838, and other Diclidophora species parasitic on gadid fishes: D. denticulata

Diclidophora nezumiae Munroe, Campbell, and Zwerner, 1981 is redescribed from the common grenadier, Nezumia bairdi (Macrouridae), in the Gulf of St. Lawrence. A prostatic vesicle is present in the terminal male genitalia. A complete lamellate extension attached to peripheral sclerite c1, is present in the clamp anterior jaw of Diclidophora nezumiae. Variability in the appearance of the clamp of Diclidophora nezumiae is presented.

Albionellafabricii n. sp. is described from the gills of the black dogfish Centroscylliumfabricii caught off the west coast of Newfoundland. Morphological differences are found in all the female and male appendages between Albionella fabricii n. sp. and A. centroscyllii, another species occurring concurrently on the same host. Female A. fabricii n. sp. can easily be distinguished from its four congeners by the length and structure of the second maxillae and the length of the uropods. A comparison between Albionella fabricii n. sp. and identifiable females of the genus Lernaeopoda is necessary, since both genera differ mainly in the morphology of the male. Two specific characteristics, the number of secondary denticles on the claw of the maxilliped and the number of setae on the exopod of the first maxilla, distinguish females of Albionella from those of Lernaeopoda.

Diclidophoroides maccallumi is redescribed from the gills of longfin hake, Phycis chesteri, caught off the coast of Newfoundland in the Gulf of St. Lawrence. Specific characteristics such as the number of genital corona spines and morphometric measurements are within the range limits given in previous descriptions of this species from red hake, Urophycis chuss. The detailed morphology of the clamp, the male genital terminalia, and the female reproductive system is presented. This redescription confirms the restoration of Diclidophoroides Price, 1943 (sensu Mamaëv, 1976) as a primitive genus in the subfamily Diclidophorinae. The generic diagnosis of Diclidophoroides should be emended to include the following: in the male genital terminalia, the presence of a prostatic vesicle, and in the clamp, the presence of a partially developed lamellate extension, b, originating from median sclerite a1, with distal attachment to the terminal half of peripheral sclerite c1, with no proximal border between sclerites a2 and c2, and the presence of a sucker in the inner side. Major generic characteristics that differentiate the genera Diclidophoroides and Diclidophora are briefly discussed. The occurrence of Diclidophoroides maccallumi on Phycis chesteri in the Gulf of St. Lawrence represents a northern range extension of the parasite and a new host record, and provides further evidence for the close phylogenetic affinity between Phycis chesteri and the genus Urophycis.

Mamaevodiclidophora nom.nov. is proposed as a generic replacement name for Neodiclidophora Mamaëv, 1987, a junior homonym of Neodiclidophora Gupta and Krisha, 1979. The detailed morphology of the male genital terminalia and the clamp in Mamaevodiclidophora pugetensis (Robinson, 1961) comb.nov. is redescribed and illustrated from specimens collected from the gills of Atherestes stomias (Pleuronectidae) in the northeastern Pacific. The generic diagnosis is emended to include, in the male genital terminalia, a prostatic vesicle and, in the clamp, a partially developed lamellate extension, b, with a complete proximal border between sclerites a2 and c2. Neodiclidophora Gupta and Krishna, 1979 is briefly discussed. The description of the type species, Neodiclidophora simhai Gupta and Krisha, 1979, from the gills of Takifugu (= Tetradon) oblongus (Tetraodontidae) in India, is compared with another species reported from the same host and locality, Diclidophora indica Tripathi, 1959, species incertae sedis. Neodiclidophora Khoche, 1969 from the gills of Saurida tumbil (Synodontidae) in India, is probably Osphyobothrus bychowskyi Khoche and Chauhan, 1969 and is dismissed as a nomen nudum.