Synonymy of Hofmonostomum Harwood, 1939, with Paramonostomum Luhe, 1909 (Digenea, Notocotylidae)

The genus Hofmonostomum Harwood, 1939, is shown to have been established on the basis of characters derived from misinterpretation of the anatomy of the sole species, H. himantopidis Harwood, 1939. The species is consistent with the anatomy of Paramonostomum species. Hofmonostomum is placed in synonymy with Paramonostomum and the new combination P. himantopidis (Harwood, 1939) Cribb, 1991, is proposed

A new species of Phyllodistomum (Digenea: Gorgoderidae) from Australian and New Zealand freshwater fishes with notes on the taxonomy of Phyllodistomum Braun, 1899

Phyllodistomum magnificum sp. nov., is described from the urinary bladder of Australian and New Zealand freshwater fish. Australian hosts were Anguilla reinhardtii, Tandanus tandanus, Hephaestus fuliginosus and Scortum hilli. New Zealand hosts were Anguilla australis and A. dieffenbachii. A presumed part of the life-cycle is described. Typical cystocercous cercariae are produced by sporocysts in the gills of a Pisidium species and are eaten by aquatic arthropods in which they encyst. The taxonomy of the genus Phyllodistomum is discussed and it is suggested that those species with cystocercous cercariae form a phylogenetic unit with Gorgodera, Gorgoderina, Progorgodera and Gorgotrema species

Two new digenetic trematodes from Australian freshwater fishes with notes on previously described species

Austrohalipegus anguillicola gen. et sp. nov. is described from the stomach of Anguilla reinhardtii Steindachner. Austrohalipegus is distinguished from other derogenid genera by the absence of filaments on its eggs, by the presence of blindly ending caeca, by having the ventral sucker in the middle of the body, by having the sinus-sac enclose only the hermaphroditic duct, and by the uterus which does not extend posterior to the vitellarium. Austrohalipegus anguillicola is distinctive in having a large temporary sinus-organ formed by a completely eversible hermaphroditic duct. Isoparorchis hypselobagri (Billet) is recorded as juveniles of 1-3 mm in length from the coelom and as larger juveniles and adults from the swim bladder of Tandanus tandanus Mitchell. The miracidium is typically hemiuroid and has a crown of apical spines and cilia in lateral bunches. Experimental infections in which the prosobranch snails Posticobia brazieri and Melanoides tuberculatus were fed embryonated eggs produced infections of mother sporocysts. It is postulated that the life-cycle includes an obligate period of development in the coelom of the definitive host for the Australian form of the species. Stegodexamene watsoni sp. nov. is described from the intestine of Maccullochella peek (Mitchell). It is distinguished from the two other species of this genus by its considerably larger cirrus pouch and its more extensive vitellaria. Burnellus trichofurcatus (Johnston and Angel) is recorded from new hosts, Arius graeffei Kner and Steindachner and Neosilurus ater (Perugia). Aspects of its biology are discussed. Pretestis australianus Angel and Manter is recorded from a new host, Scortum hilli Castelnau, extending the known range of this species

The life-cycle and biology of Opecoelus-Variabilis, Sp-Nov (Digenea, Opecoelidae)

Opecoelus variabilis, sp. nov., is described from the intestine of 17 species of Australian freshwater fish. The highly variable anatomy of this species highlights the closeness of Opecoelus and Opegaster. Opegaster is made a synonym of Opecoelus and a new diagnosis is proposed for Opecoelus. The first intermediate host of O. variabilis is the prosobranch snail Posticobia brazieri, and the second intermediate hosts are five species of atyid, palaemonid and parastacid Crustacea. Features of the life cycle are the production of daughter sporocysts by the mother sporocyst when only one-quarter of its full size, and the further development of the metacercaria in the second intermediate host after becoming infective to the definitive host

The life-cycle and morphology of Stemmatostoma-Pearsoni, Gen Et Sp-Nov, with notes on the morphology of Telogaster-Opisthorchis Macfarlane (Digenea, Cryptogonimidae)

Stemmatostoma pearsoni, gen. et sp. nov., is described from the intestine of Leiopotherapon unicolor (Gunther) and Macquaria novemaculeata (Steindachner) in Queensland. Stemmatostoma is placed within the Neochasminae and is distinguished by its long oesophagus, compact ovary, short caeca, pre-ovarian vitellaria, simple gonotyl and funnel-shaped oral sucker. The diagnosis of the Neochasminae is emended excluding Parspina Pearse. Telogaster opisthorchis Macfarlane is recorded from the intestine of Anguilla reinhardtii Steindachner from Victoria. The spinose oral suckers of S. pearsoni and T. opisthorchis are capable of being retracted into tegumental pockets. It is postulated that this arrangement may be widespread amongst spinose cryptogonimids. The first intermediate host of S. pearsoni is Posticobia brazieri (Smith), a prosobranch snail. The second intermediate hosts are freshwater fish: Hypseleotris galii (Ogilby), H. compressus (Krefft), Mogurnda mogurnda (Richardson), M. adspersa (Castelnau), Philypnodon grandiceps (Krefft), Gobiomorphus australis (Krefft), and Pseudomugil signifer Kner. Within the snail there is a mother sporocyst generation, a redial generation and a cercarial generation. Development of the mother sporocyst is similar to that described for other opisthorchioids. Cryptogonimid cercariae are characterized by 16 flame-cells, pre-vesicular penetration glands, dorso-ventral caudal finfolds and absence of body pigmentation. On the basis of cercarial and adult morphology it is proposed that Pseudexorchis Yamaguti be excluded from the Cryptogonimidae

New didymozoid trematodes from

Two new species of didymozoid trematodes are described from two species of Onigocia-stem platycephalid (flathead) fishes from Moreton Bay, Australia. Indodidymozoon metridion n. sp. is described from the operculum of Suggrundus jugosus. Indodidymozoon ditremion n. sp. is described from the buccal cavity, branchial arches and pharynx of Inegocia japonica. The two species can be distinguished from other species in the genus Indodidymozoon, except Indodidymozoon branchiale, by their two anterior uterine loops, which are located posterior to the fore-bodyhindbody junction. The new species can be differentiated from I. branchiale by the length of their testes. Indodidymozoon metridion differs from I. ditremion in body size, position of ventral sucker and relative testis length. The structure of the Laurer's canal and Juel's organ of species in the genus Indodidymozoon is discussed

New Didymozoid Trematodes from Onigocia-stem Platycephalid fishes

Two new species of didymozoid trematodes are described from two species of Onigocia-stem platycephalid (flathead) fishes from Moreton Bay, Australia. Indodidymozoon metridion n. sp. is described fro the operculum of Suggrundus jugosus. Indodidymozoon ditremion n. sp. is described from the buccal cavity, branchial arches and pharynx of inegocia japonica. The two species can be distingished from other species in the genus Indodidymozoon, except Indodidymozoon branchiale, by their two anterior uterine loops, which are located posterior to the fore-body-hindbody junction. The new species can be differentiated from I. branchiale by the length of their testes. Indodidymozoon metridian differs from I. ditremion in body size, position of ventral sucker and relative testis length. The structure of the Laurer's canal and Juel's organ of species in the genus Indodidymozoon is discussed

Athesmioides aiolos Cribb and Spratt, 1992 (Digenea: Dicrocoeliidae), from Potorous tridactylus (Marsupialia: Potoroidae) in Tasmania, Australia

Athesmioides aiolos Cribb and Spratt, 1992, is recorded from Potorous tridactylus (Marsupialia: Potoroidae) from Tasmania, Australia. The specimens are much larger than those reported previously from rodents, but the differences are interpreted as being host-induced. This is the first record of a dicrocoeliid from a macropodoid marsupial

Cableia pudica n sp (Digenea:acanthocolpidae) from monacanthid fishes of the Southern Great Barrier Reef, Australia

A new species, Cobleia pudica, is described from the monacanthid fishes Contheschenia grandisquamis, Cantherhines dumerili, Cantherhines pardalis and Pervagor janthinosoma from reef waters around Heron Island, southern Great Barrier Reef, Queensland, Australia. It differs from the only other species in the genus, Cableia trigoni Sogandares-Bernal, 1959 in the more elongate cirrus-sac, longer post-testicular region, smaller prepharynx, the less anterior extent of the vitelline fields and dorsalty subterminal excretory pore. The status of the genus is discussed, but no firm conclusion reached. It is placed, pro tern, in the Acanthocolpidae. The great majority of specimens lack spermatozoa, suggesting that parthenogenesis may occur