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Twenty-nine dactylogyrid species were reported from teleosts collected during a survey of the parasites of fishes of Moreton Bay, Queensland, Australia, in 2016. Two new genera, Ecnomotrema n. gen. and Pleuronectitrema n. gen., were proposed, and 13 new species were illustrated and described: Atherinicus difficilis n. sp., Diversohamulus similis n. sp., and Ecnomotrema cetiosum n. sp. from Atherinomorus vaigiensis ; Haliotrema apiculum n. sp. from Pempheris schwenkii ; Haliotrema tugulduriforme n. sp. from Scarus ghobban ; Lethrinitrema australiense n. sp., and Lethrinitrema lituus n. sp. from Lethrinus nebulosus ; Tetrancistrum siganioides n. sp. from Siganus fuscescens ; Ligophorus bostrychus n. sp. from Planiliza subviridis ; Neohaliotrema gemmula n. sp. from Abudefduf vaigiensis ; Neohaliotrema moretonense n. sp. from Ab. vaigiensis and Ab. bengalensis ; and Pleuronectitrema spirula n. sp. from Pseudorhombus arsius (all from Moreton Bay); Pleuronectitrema kuwaitense Kritsky & Sey n. sp. was described from specimens collected from P. arsius in Kuwait during 1996. Ten new host records were recorded: Chauhanellus duriensis Lim, 1994 and Hamatopeduncularia thalassini Bychowsky & Nagibina, 1969 from Pararius proximus ; Diplectanotrema sp. 1 and sp. 2 from Sillago maculata and Goniistius vestitus , respectively; Diversohamulus tricuspidatus Bychowsky & Nagibina, 1969 from At. vaigiensis ; Hal. cf. dempsteri (Mizelle & Price, 1964) Young, 1968 from Prionurus microlepidotus ; Hal. spirale Yamaguti, 1968 from Upeneus tragula ; Ligophorus kaohsianghsieni (Gussev, 1962) Gussev, 1985 from Planiliza subviridis ; and Neohaliotrema malayense Lim & Gibson, 2010 from Ab. bengalensis and Ab. whitleyi . Twenty-five new faunal records for Moreton Bay were recorded, including the new species listed above and C . duriensis , Diplectanotrema sp. 1 and sp. 2, Diversohamulus tricuspidatus Bychowsky & Nagibina, 1969, Glyphidohaptor phractophallus Kritsky, Galli, & Yang, 2007, Hal. cf. dempsteri , Hal. johnstoni Bychowsky & Nagibina, 1970, Hal. spirale , Yamaguti, 1968 Hamatopeduncularia thalassini Bychowsky & Nagibina, 1969, Lethrinitrema nebulosum Sun, Li, & Yang, 2014, Ligophorus kaohsianghsieni (Gussev, 1962) Gussev, 1985, Ligophorus parvicopulatrix Soo & Lim, 2012, and Neohaliotrema malayense Lim & Gibson, 2010. Three new combinations were proposed: Hal. spariense Roubal, 1981 as Euryhaliotrema spariense (Roubal, 1981) n. comb.; and Hal. arsiosa Venkatanarasaiah, 1984 and Hal. youngi Venkatanarasaiah, 1984 as Pleuronectitrema arsiosa (Venkatanarasaiah, 1984) n. comb. and Pleuronectitrema youngi (Venkatanarasaiah, 1984) n. comb., respectively; Haliotrema sp. of Zhang is transferred to Pleuronectitrema as Pleuronectitrema sp. Hal. ctenochaeti Yamaguti, 1968 was replaced with Hal. asymphylum n. nom. to remove it from homonymy with Hal. ctenochaeti Young, 1968. Pseudohaliotrematoides zancli Yamaguti, 1968 was transferred to Haliotrema as Haliotrema hawaiiense n. nom. Hal. zancli Yamaguti, 1968 was considered a junior subjective synonym of Hal. dempsteri . Vingt-neuf espèces de Dactylogyridae sont signalées chez des téléostéens collectés lors d’une étude des parasites des poissons de Moreton Bay, Queensland, Australie, en 2016. Deux nouveaux genres, Ecnomotrema n. gen. et Pleuronectitrema n. gen., sont proposés, et 13 nouvelles espèces sont illustrées et décrites : Atherinicus difficilis n. sp., Diversohamulus similis n. sp., et Ecnomotrema cetiosum n. sp. d’ Atherinomorus vaigiensis  ; Haliotrema apiculum n. sp. de Pempheris schwenkii  ; Haliotrema tugulduriforme n. sp. de Scarus ghobban  ; Lethrinitrema australiense n. sp. et Lethrinitrema lituus n. sp. de Lethrinus nebulosus , Tetrancistrum siganioides n. sp. de Siganus fuscescens  ; Ligophorus bostrychus n. sp. de Planiliza subviridis  ; Neohaliotrema gemmula n. sp. d’ Abudefduf vaigiensis  ; Neohaliotrema moretonense n. sp. d’ Ab. vaigiensis et Ab. bengalensis  ; et Pleuronectitrema spirula n. sp. de Pseudorhombus arsius (tous de Moreton Bay). Pleuronectitrema hawaiiense Kritsky & Sey n. sp. est décrit à partir de spécimens collectés de P. arsius au Koweït en 1996. Dix nouvelles combinaisons parasites-hôtes sont répertoriées : Chauhanellus duriensis Lim, 1994 et Hamatopeduncularia thalassini Bychowsky & Nagibina, 1969 de Pararius proximus  ; Diplectanotrema sp. 1 et sp. 2, respectivement de Sillago maculata et Goniistius vestitus  ; Diversohamulus tricuspidatus Bychowsky & Nagibina, 1969 d’ At. vaigiensis  ; Hal. cf. dempsteri (Mizelle & Price, 1964) Young, 1968 de Prionurus microlepidotus  ; Hal. spirale Yamaguti, 1968 d’ Upeneus tragula  ; Ligophorus kaohsianghsieni (Gussev, 1962) Gussev, 1985 de Planiliza subviridis  ; et Neohaliotrema malayense Lim & Gibson, 2010 d’ Ab. bengalensis et Ab. whitleyi . Vingt-cinq nouveaux signalements fauniques pour la baie Moreton sont rapportés, y compris les nouvelles espèces énumérées ci-dessus et C. duriensis , Diplectanotrema sp. 1 et sp. 2, Diversohamulus tricuspidatus Bychowsky & Nagibina, 1969, Glyphidohaptor phractophallus Kritsky, Galli et Yang, 2007, Hal. cf. dempsteri , Hal. johnstoni Bychowsky et Nagibina, 1970, Hal. spirale , Hamatopeduncularia thalassini Bychowsky & Nagibina, 1969, Lethrinitrema nebulosum Sun, Li, & Yang, 2014, Ligophorus kaohsianghsieni (Gussev, 1962) Gussev, 1985, Ligophorus parvicopulatrix Soo & Lim, 2012, et Neohaliotrema malayense Lim et Gibson, 2010. Trois nouvelles combinaisons sont proposées : Hal. spariense Roubal, 1981 comme Euryhaliotrema spariense (Roubal, 1981) n. comb. ; Hal. arsiosa Venkatanarasaiah, 1984 et Hal. youngi Venkatanarasaiah, 1984, respectivement comme Pleuronectitrema arsiosa (Venkatanarasaiah, 1984) n. comb. et Pleuronectitrema youngi (Venkatanarasaiah, 1984) n. comb. ; Haliotrema sp. de Zhang est transféré à Pleuronectitrema sous le nom de Pleuronectitrema sp. Hal. ctenochaeti Yamaguti, 1968 est remplacé par Hal. asymphylum n. nom. pour supprimer l’homonymie avec Hal. ctenochaeti Young, 1968. Pseudohaliotrematoides zancli Yamaguti, 1968 est transféré à Haliotrema sous le nom de Haliotrema hawaiiense n. nom. Hal. zancli Yamaguti, 1968 est considéré comme un synonyme subjectif junior de Hal. dempsteri .

As part of a survey of the parasites infecting the fishes of Moreton Bay, Queensland, Australia, the gill lamellae of two species, the common silver-biddy Gerres oyena (Forsskål) and the common silver belly Gerres subfasciatus Cuvier (both Gerreidae), were found infected with monogenoids as follows: Metahaliotrema filamentosum Venkatanarasaiah, 1981 (Dactylogyridae) was redescribed from G. oyena and recorded from G. subfasciatus (both new host records); Metahaliotrema imparilis n. sp., Protogyrodactylus monacanthus n. sp., Protogyrodactylus vulgaris n. sp. (all Dactylogyridae), Gyrodactylus xynus n. sp. (Gyrodactylidae), and Polylabris gerres (Sanders, 1944) Mamaev & Parukin, 1976 (Microcotylidae) were reported from G. subfasciatus; and Protogyrodactylus scalmophorus n. sp., Protogyrodactylus ichthyocercus n. sp., and Protogyrodactylus similis n. sp. were recorded from G. oyena. The new species are described, and the finding of M. filamentosum and P. gerres from Moreton Bay represent new geographic records. Haliotrema digyroides Zhang, 2001 and Haliotrema subancistroides Zhang, 2001 are transferred to Metahaliotrema Yamaguti, 1953 as Metahaliotrema digyroides (Zhang, 2001) n. comb. and Metahaliotrema subancistroides (Zhang, 2001) n. comb., respectively.

Platycephalotrema n. gen. (Dactylogyridae) is proposed for four new species and 5 previously described species parasitizing the gills of flatheads (Scorpaeniformes: Platycephalidae) as follows: Platycephalotrema ogawai n. sp. (type species) from Platycephalus sp. 1 (type host) and Platycephalus sp. 2, both of Nakabo & Kai (2013) (locally known as “Yoshino-gochi” and “Ma-gochi,” respectively) (Japan); Platycephalotrema austrinum n. sp. from Platycephalus endrachtensis Quoy & Gaimard (type host) and Platycephalus sp. (Australia); Platycephalotrema bassensis (Hughes, 1928) n. comb. from Platycephalus bassensis Cuvier (Australia); Platycephalotrema koppa n. sp. from Platycephalus fuscus Cuvier (Australia); Platycephalotrema macassarensis (Yamaguti, 1963) n. comb. from Platycephalus indicus (Linnaeus) (China, Macassar); Platycephalotrema mastix n. sp. from P. fuscus and P. endrachtensis (Australia); Platycephalotrema platycephali (Yin & Sproston, 1948) n. comb. from P. indicus (China) and P. fuscus (Australia); Platycephalotrema sinensis (Yamaguti, 1963) n. comb. from Cociella punctata (Cuvier) (China); Platycephalotrema thysanophrydis (Yamaguti, 1937) n. comb. from Inegocia japonica (Cuvier), Inegocia ochiaii Imamura, and Cociella crocodilus (Cuvier) (Japan, China). Other species requiring further study but potentially members of Platycephalotrema include Ancyrocephalus vesiculosus Murray, 1931, Haliotrema indicum Tripathi, 1957, Haliotrema swatowensis Yao, Wang, Xia, & Chen, 1998, and Haliotrema pteroisi Paperna, 1972. The primary features differentiating Platycephalotrema include species having: (1) tandem gonads (testis postgermarial); (2) two prostatic reservoirs, each emptying independently into the base of the male copulatory organ; (3) a dextral vaginal pore and large vaginal vestibule; (4) dorsal and ventral pairs of morphologically similar anchors; (5) a ventral bar with spatulate ends; (6) a dorsal bar with bifurcated ends, and (7) absence of an accessory piece. The new species are described, and P. thysanophrydis is redescribed based on newly collected and museum specimens.

Twenty one of 29 species of snappers (Lutjanidae), examined for dactylogyrids (Monogenoidea) from the Red Sea, Persian Gulf, the Indo-west and eastern Pacific Ocean, the Gulf of Mexico, and Caribbean Sea were parasitized by 16 new and 11 previously described species of Euryhaliotrema: Euryhaliotrema adelpha sp. nov., Euryhaliotrema anecorhizion sp. nov., Euryhaliotrema cardinale sp. nov., Euryhaliotrema chrysotaeniae, Euryhaliotrema cognatus sp. nov., Euryhaliotrema cryptophallus sp. nov., Euryhaliotrema diplops sp. nov., Euryhaliotrema distinctum sp. nov., Euryhaliotrema fajeravilae sp. nov., Euryhaliotrema fastigatum, Euryhaliotrema fatuum sp. nov., Euryhaliotrema ferocis sp. nov., Euryhaliotrema hainanense, Euryhaliotrema longibaculum, Euryhaliotrema mehen comb. nov., Euryhaliotrema paracanthi, Euryhaliotrema paululum sp. nov., Euryhaliotrema perezponcei, Euryhaliotrema ramulum sp. nov., Euryhaliotrema seyi sp. nov., Euryhaliotrema simplicis sp. nov., Euryhaliotrema spirotubiforum, Euryhaliotrema tormocleithrum sp. nov., Euryhaliotrema torquecirrus, Euryhaliotrema tubocirrus, Euryhaliotrema xinyingense, and Euryhaliotrema youngi sp. nov. Six species of Euryhaliotrema, previously reported from lutjanid hosts, were not collected: Euryhaliotrema anguiformis comb. nov., Euryhaliotrema guangdongense, Euryhaliotrema johni, Euryhaliotrema lutiani, Euryhaliotrema lutjani, and Euryhaliotrema nanaoense comb. nov. The diagnosis of Euryhaliotrema was emended to include species having tandem or slightly overlapping gonads, a pretesticular germarium, a globose haptor with morphologically similar anchors and hooks, a coiled or meandering male copulatory organ, a dextral vaginal pore, and hooks with upright acute thumbs and slender shanks comprised of one subunit. A bulbous base of the MCO and presence of an accessory piece in the copulatory complex were no longer considered features defining the genus. As a result, Euryhaliotrematoides and Aliatrema were placed in subjective synonymy with Euryhaliotrema, and the following transfers were proposed: Euryhaliotrema annulocirrus comb. nov., Euryhaliotrema aspistis comb. nov., Euryhaliotrema berenguelae comb. nov., Euryhaliotrema cribbi comb. nov., Euryhaliotrema grandis comb. nov., Euryhaliotrema mehen comb. nov., Euryhaliotrema microphallus comb. nov., Euryhaliotrema pirulum comb. nov., and Euryhaliotrema triangulovagina comb. nov. In addition, the following new combinations were proposed based on the revised diagnosis of the genus: Euryhaliotrema anguiformis comb. nov., Euryhaliotrema eukurodai comb. nov., Euryhaliotrema kurodai comb. nov., Euryhaliotrema monoporosum comb. nov., and Euryhaliotrema nanaoense comb. nov. The dactylogyrids, Protancyrocephalus rangusi (from a lutjanid host) and Daitreosoma chaetodontis (from a chaetodontid host), were considered species inquirendae. Haliotrematoides tukerhamatus comb. nov. is considered the senior subjective synonym of Haliotrematoides nagabinae. New host records for some previously described species of Euryhaliotrema from lutjanid and chaetodontid hosts were reported.

Two species of Bychowskicotylidae (Monogenoidea: Gastrocotylinea) were collected from the gills of the sweetlips Diagramma labiosum Macleay (Haemulidae) obtained from Moreton Bay, Queensland, Australia, during January 2016. Lebedevian. gen. is proposed for bychowskicotylids having 1) a bilaterally symmetrical haptor with four pairs of gastrocotylid-like clamps and lacking an armed lappet (anchors and hooks absent); 2) longitudinal sclerotized internal ridges lining the vas deferens, 3) an unarmed male copulatory organ, and 4) four interconnected vesicles located posterior to the genital atrium and lying on the body midline dorsal to the uterus and ventral to the vas deferens. Lebedevia lebedevin. sp., the type and only species of the genus, is described, and Tonkinopsis transfretanus Lebedev, 1972 is recorded for the first time in Moreton Bay. Yamaguticotyla Price, 1959 (Bychowskicotylidae) is considered nomen nudum, and the authorship of the genus is corrected to Yamaguticotyla Yamaguti, 1963.

An analysis of the nomenclature of Heteraxinoides Yamaguti, 1943, Heteraxinoides Yamaguti, 1963, Allopseudaxine Yamaguti, 1943, Axine tripathii Price, 1962, and Axine tripathii Yamaguti, 1963 was conducted, which resulted in the proposal of the following: 1) the subgenus Heteraxinoides Yamaguti, 1943 is a nomen nudum; 2) Heteraxinoides Price, 1962 and Heteraxinoides inada (Ishii & Sawada, 1938) Price, 1962 represent the correct authorships for the respective taxa; 3) Heteraxinoides Yamaguti, 1963 and Heteraxinoides Yamaguti sensu Price are junior homonyms of Heteraxinoides Price, 1962; 4) Heteraxinoides Price, 1962 is a junior subjective synonym of Axine Abildgaard, 1794; 5) Heteraxinidae Price, 1962 is a junior objective synonym of Heteraxinidae Unnithan, 1957; 6) Allopseudaxine Yamaguti, 1943 is valid and available sensu the International Code of Zoological Nomenclature; and 7) the homonyms Axine tripathii Price, 1962 and Axine tripathii Yamaguti, 1963 are objective junior synonyms of Axine hemirhamphae Tripathi, 1959. Neoheteraxinoidesnom. nov. is proposed to replace the junior homonym Heteraxinoides Yamaguti, 1963, and the following new combinations are advanced: Neoheteraxinoides argiropsi (Mamaev, 1977) comb. n., N. atlanticus (Gayevskaya & Kovaljova, 1979) comb. n., N. caprodontis (Yamaguti, 1968) comb. n., N. chinensis (Yamaguti, 1937) comb. n., N. hargisi (Price, 1962) comb. n., N. novaezealandiae (Dillon & Hargis, 1965) comb. n., N. oligoplitis (Meserve, 1938) comb. n., N. pseudosciaenai (Gupta & Khullar, 1968) comb. n., N. regis (Dillon & Hargis, 1965) comb. n., N. scorpis (Sanders, 1944) comb. n., N. triangularis (Goto, 1894) comb. n. (type species), N. xanthophilis (Hargis, 1956) comb. n., N. xanthophiloides (Price, 1962) comb. n., and N. zhukovi (Caballero & Bravo Hollis, 1963) comb. n.

Three species of beloniform fishes were found infected with species of Monogenoidea Bychowsky, 1937 during a survey of the diversity of parasites infecting the fishes of Moreton Bay, Queensland, Australia. The diagnoses of Hareocephalus Young, 1969 and Hemirhamphiculus Bychowsky & Nagibina, 1969 (both Polyonchoinea Bychowsky, 1937: Dactylogyridae Bychowsky, 1933) were emended. Hareocephalus thiasae Young, 1969, type-species of the genus, was recorded and redescribed from the gill lamellae of the stout longtom Tylosurus gavialoides (Castelnau) (Belonidae), and six new species of Hemirhamphiculus were described from the gill lamellae of three host species: Hemirhamphiculus exserocephalus n. sp. from T. gavialoides; Hemirhamphiculus choanophallus n. sp. and Hemirhamphiculus flagrum n. sp. from the river garfish Hyporhamphus regularis (Günther) (Hemiramphidae); and Hemirhamphiculus perexiguus n. sp., Hemirhamphiculus krabsi n. sp., and Hemirhamphiculus imcomptus n. sp. from the southeastern snub-nose garfish Arrhamphus sclerolepis krefftii (Steindachner) (Hemiramphidae). An unidentified species of the Suborder Microcotylinea Lebedev, 1972 (Heteronchoinea Boeger & Kritsky, 2001) was found infecting single specimens of each of H. regularis and A. sclerolepis krefftii. Parahemirhamphiculus Bychowsky & Nagibina, 1969 is placed in junior subjective synonymy with Hemirhamphiculus, and its three species, Parahemirhamphiculus pinguis Bychowsky & Nagibina, 1969, Parahemirhamphiculus brevilamellatus Zhang, 2001, and Parahemirhamphiculus longilamellatus An & Zhang, 1988 are transferred to Hemirhamphiculus.

An undescribed species of KannaphallusUnnithan, 1957 (Monogenoidea: Heteraxinidae) was collected from the gills of the golden trevally Gnathanodon speciosus (Forsskål) (Carangidae) from Moreton Bay, Queensland, during January 2016 and from Ningaloo Reef, Western Australia, during December 2021 and June 2022. The diagnosis for Kannaphallus was emended and the new species, Kannaphallus raphidium, was described. Kannaphallus virilis of Young, nec Unnithan was placed in synonymy with K. raphidium. The distal components of the male reproductive system and the arrangement of the clamp rows of the haptor occurred as mirror images among specimens of K. raphidium, suggesting that the respective antipodes of K. raphidium may have reproductive implications and function in the site selection of the parasite on the host's gills. A specimen of K. raphidium from Western Australia was sequenced for the cytochrome c oxidase subunit 1 (COI) mtDNA and ITS2 rDNA barcoding markers, and the phylogenetically informative 28S rDNA marker. Maximum likelihood and Bayesian inference analyses based on a partial 28S rDNA alignment, including all comparable heteraxinid sequence data available, resolved the Heteraxininae and Cemocotylinae as reciprocatively paraphyletic and provided evidence that Kannaphallus may be paraphyletic. No taxonomic changes concerning the subfamilies and genera of the Heteraxinidae were proposed. Finally, Kannaphallus univaginalisRamalingam, 1960 and Cemocotylelloides univaginalis (Ramalingam, 1960) Nitta, Kondo, Ohtsuka, Kamarudin, and Ismail, 2022 are considered nomen nuda sensu the International Code of Zoological Nomenclature.

Purple-spotted bigeyes Priacanthus tayenus Richardson (Priacanthidae) and bartail flathead Platycephalus indicus (Linnaeus) (Platycephalidae) were collected from the Arabian Gulf and examined for species of Monogenoidea (Polyonchoinea) from February to December 2020. Diplectanum robustitubum Wu & Li, 2003 and an undescribed species of Platycephalotrema Kritsky & Nitta, 2019 were recovered from the gill lamellae of these hosts, respectively. Diplectanum robustitubum from Iraq was redescribed and transferred to Oliveriplectanum Domingues & Boeger, 2008 (Diplectanidae) as Oliveriplectanum robustitubum (Wu & Li, 2003) n. comb. Platycephalotrema parile n. sp. (Dactylogyridae) from Iraq and Kuwait was described and differentiated from the similar species, Haliotrema indicum Tripathi, 1959, Platycephalotrema ogawai Kritsky & Nitta, 2019, and Platycephalotrema platycephali (Yin & Sproston, 1948) Kritsky & Nitta, 2019, based primarily on the comparative morphologies of the vaginal sclerites. Haliotrema indicum was transferred to Platycephalotrema as Platycephalotrema indicum (Tripathi, 1959) n. comb. and Haliotrema swatowense Yao, Wang, Xia, & Chen, 1998 was considered a junior subjective synonym of P. indicum . The finding of O. robustitubum in the Arabian Gulf represents a new geographic record for the species. Background The present paper represents the third installment concerning the monogenoids collected during surveys to explore their diversity on the marine and freshwater fishes of Iraq. Previous installments on the monogenoids emanating from the surveys included the dactylogyrid and gyrodactylid species parasitizing mugilid fishes. Purpose The purpose of this paper is to further document the diversity of monogenoids infecting the fishes of Iraq. Methods Marine fishes were necropsied for parasites, and standard procedures for collecting, mounting, drawing, and measuring of monogenoids were employed. Results Oliveriplectanum robustitubum n. comb. (Diplectanidae) and Platycephalotrema parile n. sp. (Dactylogyridae) were collected. The occurrence of O. robustitubum in the Arabian Gulf represented a new locality record for the species. Conclusion The recorded presence of O. robustitubum and P. parile n. sp. suggests that the diversity of monogenoids in Iraq is under estimated in the literature.

During registration of specimens of Protogyrodactylus scalmophorus and Protogyrodactylus ichthyocercus for the Queensland Museum, it was noticed that the collection sites of the holotypes of the two species provided on the slide labels did not correspond to the published type-localities. While both species were collected from two localities within Moreton Bay as recorded in the paper, the type-locality for each is here corrected to that reported as the “Other locality” in the respective taxonomic summaries.