NEW INSIGHTS BASED ON MORPHOLOGICAL AND MOLECULAR DATA REVEAL THE TAXONOMIC STATUS OF HALIOTREMA PTEROISI (MONOGENOIDEA: DACTYLOGYRIDAE) INFECTING DEVIL FIREFISH PTEROIS MILES (PERCIFORMES: SCORPAENOIDEI: SCORPAENIDAE) IN THE RED SEA OFF EGYPT.

Paperna, 1972 (Monogenoidea: Dactylogyridae) was found parasitizing the gill lamellae of devil firefish, Pterois miles (Bennet) (Perciformes: Scorpaenidae), in the Red Sea off Safaga (26°44'N, 33°56'E), Egypt. The parasite species was described based on morphological features of available specimens and transferred to PlatycephalotremaKritsky and Nitta, 2019 (Dactylogyridae) as Platycephalotrema pteroisi (Paperna, 1972) n. comb.

Taxonomic Status of Diplectanum robustitubum Wu & Li, 2003 (Monogenoidea: Diplectanidae) from the Purple-Spotted Bigeye Priacanthus tayenus (Priacanthidae) and the Description of Platycephalotrema parile n. sp. (Monogenoidea: Dactylogyridae) from the Bartail Flathead Platycephalus indicus (Platycephalidae), in the Arabian Gulf.

Unlabelled: 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.

Species of Dactylogyridae (Platyhelminthes: Monogenoidea) infecting marine fishes of Moreton Bay, Queensland, Australia, with proposals of Pleuronectitrema n. gen. and Ecnomotrema n. gen. and descriptions of 13 new species.

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.

KANNAPHALLUS RAPHIDIUM N. SP. (MONOGENOIDEA: MAZOCRAEIDEA: HETERAXINIDAE) PARASITIC ON THE GILL LAMELLAE OF THE GOLDEN TREVALLY GNATHANODON SPECIOSUS (CARANGIFORMES: CARANGIDAE) OCCURRING IN THE COASTAL WATERS OF QUEENSLAND AND WESTERN AUSTRALIA.

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.

Axinids (Monogenoidea: Mazocraeidea: Microcotylinea) infecting the gill lamellae of some beloniform fishes in the Gulf of Mexico, with descriptions of Axine buccina n. sp. from Hyporhamphus unifasciatus (Ranzani) and Nudaciraxine timucua n. sp. from Strongylura timucu (Walbaum).

Five species of Axinidae (Monogenoidea: Mazocraeidae) were recovered from the gill lamellae of four of six species of needlefishes and halfbeaks examined from the Gulf of Mexico off Florida: Axine buccina n. sp. from a common halfbeak Hyporhamphus unifasciatus (Ranzani); Nudaciraxine gracilis (Linton, 1940) Price, 1962 (minimum prevalence 60%) from the Atlantic needlefish Strongylura marina (Walbaum); Nudaciraxine timucua n.

Bychowskicotylids (Monogenoidea: Gastrocotylinea) infecting the gills of the sweetlips Diagramma labiosum Macleay (Haemulidae) in Moreton Bay, Queensland, Australia, with the proposal of Lebedevia n. gen. and description of Lebedevia lebedevi n. sp.

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. Lebedevia n. gen.

The nomenclatural status of Heteraxinoides Yamaguti, 1943, Heteraxinoides Yamaguti, 1963, Allopseudaxine Yamaguti, 1943, Axine tripathii Price, 1962, and Axine tripathii Yamaguti, 1963, with the proposal of Neoheteraxinoides nom. nov. (Monogenoidea: Microcotylinea).

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. Neoheteraxinoides nom. nov.

Euryhaliotrema dolichodrilus n. sp. and Euryhaliotrema mimulus n. sp. (Monogenoidea: Dactylogyridae) infecting the gill lamellae of porgies, Calamus spp. (Perciformes: Sparidae) from the Gulf of Mexico off Florida, U.S.A.

Two new species of Euryhaliotrema Kritsky & Boeger, 2002 (Monogenoidea: Dactylogyridae) were described from the gill lamellae of porgies, Calamus spp. (Perciformes, Sparidae), collected from the Gulf of Mexico off Florida: Euryhaliotrema dolichodrilus n. sp.

ON THAUMATOCOTYLE SCOTT, 1904 (MONOGENOIDEA: MONOCOTYLIDAE) AND THAUMATOCOTYLE PSEUDODASYBATIS HARGIS, 1955 WITH DESCRIPTIONS OF ITS PUTATIVE SIBLING SPECIES THAUMATOCOTYLE ADELPHA N. SP. AND THAUMATOCOTYLE CASIGNETA N. SP. PARASITIZING THE OLFACTORY ORGANS OF PELAGIC EAGLE RAYS (MYLIOBATIFORMES: AETOBATIDAE) IN THE PACIFIC OCEAN.

An emended diagnosis of ThaumatocotyleScott, 1904 (Monogenoidea: Monocotylidae) and a list of its species are provided. Merizocotyle urolophiChisholm and Whittington, 1999, Merizocotyle macrostrobusChisholm and Whittington, 2012, Merizocotyle papillaeChisholm and Whittington, 2012, and Merizocotyle rhadinopeosChisholm and Whittington, 2012 are transferred to Thaumatocotyle as new combinations. Thaumatocotyle pseudodasybatisHargis, 1955 is redescribed and is currently restricted to Thaumatocotyle-like helminths parasitizing the olfactory organs of the white-spotted eagle ray Aetobatus narinari (Euphrasen, 1790) (Myliobatiformes: Aetobatidae) in the western Atlantic Ocean.

Monocotylids (Monogenoidea) infecting elasmobranchs in Moreton Bay, Queensland, Australia, with descriptions of Calicotyle cutmorei n. sp. (Calicotylinae) and Dendromonocotyle raiae n. sp. (Monocotylinae).

Eighteen monocotylid species were collected from elasmobranchs during surveys of the parasites of fishes of Moreton Bay, Queensland, Australia. Two new species, Calicotyle cutmorei n. sp.

Heterocotyle whittingtoni n. sp. (Monogenea: Monocotylidae) from the gills of the black-spotted whipray, Maculabatis toshi (Whitley) (Myliobatiformes: Dasyatidae), collected in coastal waters of Queensland, Australia.

Heterocotyle whittingtoni n. sp. (Monogenea: Monocotylidae) is described from the gills of the black-spotted whipray Maculabatis toshi (Whitley) (Dasyatidae) collected from Moreton Bay near Dunwich and Peel Island, and from the eastern Gulf of Carpentaria off Weipa, Queensland, Australia.

Neotropical Monogenoidea. 63. Atopogyrodactylus praecipuus gen. et sp. n. (Gyrodactylidae), an oviparous gyrodactylid from the external surface of a bristlenose catfish Ancistrus sp. (Siluriformes: Loricariidae) from the Rondônian Amazon, Brazil.

Atopogyrodactylus n. gen. (Gyrodactylidae) is proposed for Atopogyrodactylus praecipuus n.

Correction to: Species of Monogenoidea infecting the gill lamellae of the common silver-biddy Gerres oyena (Forsskål) and the common silver belly Gerres subfasciatus Cuvier (Perciformes: Gerreidae) in Moreton Bay, Queensland, Australia.

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.

Euryhaliotrema spp. (Monogenoidea: Dactylogyridae) Parasitic on the Gill Lamellae of Perciform Fishes in Moreton Bay, Queensland, Australia, with the Description of Euryhaliotrema solenophallus sp. nov. from the Silver Moony Monodactylus argenteus (Linnaeus) (Monodactylidae).

Background: The present paper represented the third installment on the monogenoidean parasites collected during a workshop exploring the diversity of the parasites of fishes in Moreton Bay, Queensland, Australia. Previous reports on monogenoids collected during the workshop included species parasitizing beloniform and gerreid fishes.

Purpose: During January 2016, the author, having responsibility for the identification and description of monogenoids, participated in a workshop supported by an Australian Biological Resources Study Grant to Drs.

Species of Monogenoidea infecting the gill lamellae of the common silver-biddy Gerres oyena (Forsskål) and the common silver belly Gerres subfasciatus Cuvier (Perciformes: Gerreidae) in Moreton Bay, Queensland, Australia.

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.

Empruthotrema longipenis n. sp. (Monogenoidea: Monocotylidae: Merizocotylinae) from the olfactory sacs of the smooth butterfly ray Gymnura micrura (Bloch & Schneider) (Myliobatiformes: Gymnuridae) in the Gulf of Mexico.

A new species of Empruthotrema Johnston & Tiegs, 1922 is described based on specimens collected from the olfactory sacs of smooth butterfly rays Gymnura micrura (Bloch & Schneider) captured in Mobile Bay (northcentral Gulf of Mexico), Alabama, USA. Empruthotrema longipenis n. sp.

Resurrection of Mycteronastes (Monogenoidea: Monocotylidae), with Description of Mycteronastes caalusi n. sp. from Olfactory Sacs of the Smalltooth Sawfish, Pristis pectinata (Pristiformes: Pristidae), in the Gulf of Mexico off Florida.

Mycteronastes Kearn and Beverley-Burton, 1990 (Monogenoidea: Monocotylidae: Merizocotylinae) was resurrected from subjective synonymy with Merizocotyle Cerfontaine, 1894 , and its diagnosis was emended to include monocotylids with a haptor lacking a central loculus and having 5 peripheral (2 bilateral pairs and an unpaired anteromedial loculus), 1 interhamular, and 17 marginal loculi. The 3 species of Mycteronastes accepted herein are parasitic within the olfactory sacs of rays and sawfishes: Mycteronastes icopae ( Beverley-Burton and Williams, 1989 ) Kearn and Beverley-Burton, 1990 (type species) from the giant shovelnose ray, Glaucostegus typus (Anonymous (Bennett)) (Glaucostegidae), in the southwestern Pacific Ocean; Mycteronastes undulatae Kearn and Beverley-Burton, 1990 from the undulate ray, Raja undulata Lacepède (Rajidae), in the northeastern Atlantic Ocean; and Mycteronastes caalusi n. sp.

Revision of Metahaliotrema Yamaguti, 1953 (Monogenoidea: Dactylogyridae), with new and previously described species from the spotted scat Scatophagus argus (Linnaeus) (Perciformes: Scatophagidae) in Vietnam.

An emended diagnosis of Metahaliotrema Yamaguti, 1953 (Monogenoidea: Dactylogyridae) is provided based on specimens of six species collected from the spotted scat Scatophagus argus (Linnaeus) (Scatophagidae) in Vietnam: M. scatophagi Yamaguti, 1953 (type-species); M. cf.

Pseudorhabdosynochus species (Monogenoidea, Diplectanidae) parasitizing groupers (Serranidae, Epinephelinae, Epinephelini) in the western Atlantic Ocean and adjacent waters, with descriptions of 13 new species.

Seventeen of twenty-three species of groupers collected from the western Atlantic Ocean and adjacent waters were infected with 19 identified species (13 new) of Pseudorhabdosynochus Yamaguti, 1958 (Dactylogyridea, Diplectanidae); specimens of the Spanish flag Gonioplectrus hispanus, coney Cephalopholis fulva, marbled grouper Dermatolepis inermis, mutton hamlet Alphestes afer, and misty grouper Hyporthodus mystacinus were not infected; the yellowmouth grouper Mycteroperca interstitialis and yellowfin grouper Mycteroperca venenosa were infected with unidentified species of Pseudorhabdosynochus; the Atlantic creolefish Paranthias furcifer was infected with an unidentified species of Diplectanidae that could not be accommodated in Pseudorhabdosynochus. The following species of Pseudorhabdosynochus are described or redescribed based entirely or in part on new collections: Pseudorhabdosynochus americanus (Price, 1937) Kritsky & Beverley-Burton, 1986 from Atlantic goliath grouper Epinephelus itajara; Pseudorhabdosynochus yucatanensis Vidal-Martínez, Aguirre-Macedo & Mendoza-Franco, 1997 and Pseudorhabdosynochus justinella n. sp.

Acanthocercodes n. g. (Monogenoidea: Diplectanidae) for species parasitising threadfins (Perciformes: Polynemidae), with description of Acanthocercodes bullardi n. sp. from the Atlantic threadfin Polydactylus octonemus (Girard) and reassignment of three species of Diplectanum Monticelli, 1903 from the Indo-Pacific Ocean.

Acanthocercodes n. g. (Diplectanidae) is proposed for Acanthocercodes bullardi n.

Solostamenides paucitesticulatus n. sp. (Monogenoidea: Mazocraeidea: Microcotylidae) from the freshwater mullet Liza abu (Heckel) (Mugiliformes: Mugilidae) from Atatürk Reservoir on the Euphrates River in southern Turkey.

Solostamenides paucitesticulatus n. sp. (Monogenoidea: Microcotylidae) from the gills of the abu mullet Liza abu (Heckel) in Atatürk Reservoir in southern Turkey is described.

The phylogenetic position of the Loimoidae Price, 1936 (Monogenoidea: Monocotylidea) based on analyses of partial rDNA sequences and morphological data.

Phylogenetic analyses of partial sequences of 18S and 28S rDNA of some monogenoids, including monocotylids and a specimen of Loimosina sp. collected from a hammerhead shark off Brazil, indicated that the Loimoidae (as represented by the specimen of Loimosina sp.) represents an in-group taxon of the Monocotylidae.