Twenty six of 28 species of snappers (Lutjanidae), examined for dactylogyrids (Monogenoidea) from the Red Sea, the Indo-west and eastern Pacific Ocean, the Gulf of Mexico and the Caribbean Sea, were infected: 18 species with Euryhaliotrema spp., 17 with species of Haliotrematoides n. gen. and eight with species of undetermined dactylogyrid genera. Two species of fusiliers (Caesionidae) and one species of porgy (Sparidae) were also examined and found positive for species of Haliotrematoides. Haliotrematoides n. gen., supported by both 18S rDNA and 28S rDNA analyses, was proposed for 15 new and 15 previously described species of Haliotrema (s. l.) from lutjanid, caesionid and sparid hosts: Haliotrematoides hatzenbuehlerae n. sp., Haliotrematoides brachyflagellocirrus n. comb., Haliotrematoides caesionis n. comb., Haliotrematoides calcaris n. comb., Haliotrematoides cornigerum n. comb., Haliotrematoides gracilihamus n. comb., Haliotrematoides guttati n. comb., Haliotrematoides heteracantha n. comb., Haliotrematoides isolens n. sp., Haliotrematoides lanx n. sp., Haliotrematoides longihamus n. comb., Haliotrematoides longitubocirrus n. comb., Haliotrematoides magnigastrohamus n. comb., Haliotrematoides mastigion n. sp., Haliotrematoides mediohamides n. sp., Haliotrematoides mediohamus n. comb., Haliotrematoides nagibinae n. sp., Haliotrematoides noncalcaris n. comb., Haliotrematoides noncalcaroides n. sp., Haliotrematoides novaecaledoniae n. sp., Haliotrematoides overstreeti n. sp., Haliotrematoides parvicirrus n. comb., Haliotrematoides patellacirrus n. comb., Haliotrematoides plectridium n. sp., Haliotrematoides potens n. sp., Haliotrematoides prolixohamus n. sp., Haliotrematoides shenzhenensis n. comb., Haliotrematoides spinatus n. sp., Haliotrematoides tainophallus n. sp., Haliotrematoides zhukovi n. sp. The new genus was characterized by dactylogyrids having 1) an unique hook distribution with pairs 1, 2, 3, 7 on the peduncle or trunk of the body, pair 5 associated with the point and distal shaft of the ventral anchors, and pairs 4 and 6 located at the level of the anchor bases or shifted anteriorly to the union of the haptor and peduncle; 2) dorsal anchors lacking well-developed deep roots and having perforated bases, elongate relatively straight shafts, and superficial grooves on the distal portions of the shafts and/or points; 3) ventral anchors with developed basal roots, an elongate shaft, and superficial grooves along the distal portions of the shafts and/or points; 4) a ventral bar usually with two submedial pockets along the anterior margin; and 5) a copulatory complex lacking an accessory piece. New host and locality records for some previously described species were reported.

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Nine species of Siganus (Perciformes: Siganidae) were examined for dactylogyrids (Monogenoidea) from the Red Sea, Egypt; the Great Barrier Reef, Australia; and the South China Sea, China. Species of Tetrancistrum were found on siganids from all 3 localities; Pseudohaliotrema spp. were restricted to siganids from the Great Barrier Reef; and species representing Glyphidohaptor n. gen. were found on siganids from the Red Sea and Great Barrier Reef. Siganus argenteus from the Red Sea and Siganus vulpinus from the Great Barrier Reef were negative for dactylogyrid parasites. Glyphidohaptor n. gen. is proposed for 3 species (2 species new to science) and the new species are described: Glyphidohaptor phractophallus n. sp. from Siganus fuscescens from the Great Barrier Reef; Glyphidohaptor sigani n. sp. from Siganus doliatus (type host), Siganus punctatus, Siganus corallinus, and Siganus lineatus from the Great Barrier Reef; and Glyphidohaptor plectocirra (Paperna, 1972) n. comb. (= Pseudohaliotrema plectocirra Paperna, 1972) from Siganus luridus and Siganus rivulatus from the Red Sea.

One new species of diplectanid, Pseudorhabdosynochus shenzhenensis n. sp., is reported and described from the marine fish Epinephelus coioides off Nan'ao, Shenzhen, China. It can be differentiated from previously described species of the same genus by features of the haptoral and vaginal hard-parts. A second species, P. serrani Yamaguti, 1953, originally described from Serranus sp. from the western Pacific Ocean off the Celebes (now called Sulawesi), is redescribed based on new material from E. coioides.