Dissonus hoi n. sp. is described from female and male specimens collected from the nasal cavities of a Samson Fish (Seriola hippos Günther) captured off Rottnest Island, Western Australia. Adult female D. hoi are distinguished from their congeners by possessing the following combination of characters: (1) a quadrangular genital complex, (2) ventral spines on the genital complex, (3) pair of postantennal processes, (4) a sternal furca, (5) 1-segmented abdomen, and (6) convoluted, uniseriate egg strings. New records and intraspecific morphological variation are also given for Dissonus nudiventris collected from Australia, and Dissonus similis collected from the tropical western Pacific. A key to the valid species of Dissonus is provided.

A new mesoparasitic ergasilid copepod, Majalincola buthi n. g., n. sp., is described based on material collected from the gills of Marilyna darwinii (Castelnau) and M. meraukensis (de Beaufort) (Tetraodontidae) captured in brackish waters in northern Australia. The new genus is characterised by the presence in the fully-transformed adult female of: four tagmata (antennary, neck, postantennary cephalothoracic region and trunk region); a 5-segmented antennule; a trimerous leg 1 endopod; and a free exopod segment armed with two setae on the fifth leg. The establishment of the new genus is supported by the results of a cladistic analysis of Majalincola and members of its sister taxon.

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A redescription of Acanthochondria cyclopsetta Pearse, 1952 (Copepoda; Chondracanthidae), hitherto reported only from the Mexican flounder, Cyclopsetta chittendeni Bean (Pleuronectiformes; Paralichthyidae), from Padre Island in the Gulf of Mexico, is presented based on female specimens from the spotfin flounder, Cyclopsetta fimbriata (Goode & Bean), collected off the coast of South Carolina, U.S.A. Furthermore, a description of the male of A. cyclopsetta is provided for the first time. Acanthochondria alleni n. sp. is also described based on specimens of both sexes collected from the fantail sole, Xystreurys liolepis Jordan & Gilbert (Pleuronectiformes: Paralichthyidae), caught in the Southern California Bight, U.S.A. These two species of Acanthochondria differ morphologically from their congeners by having a Type B-V antennule and elongate leg 2 rami (Type D), but can be distinguished from each other by differences in head shape, trunk shape, the relative size of the posterolateral processes of the trunk, the relative size of the abdominal somite, the insertion point of the caudal ramus, shape of the antennule tip, ornamentation of the antennal claw, ornamentation of the labrum, number of accessory teeth on the maxilliped claw, and ornamentation of legs 1 and 2 of the adult female. The taxonomic position of Acanthochondria zebriae Ho, Kim & Kumar, 2000 and A. bicornis Shiino, 1955 as well as the validity of the chondracanthid genus Pterochondria Ho, 1973 are also discussed.