Rhabdochona angusticaudata sp. n. (Nematoda: Rhabdochonidae) from the Japanese eel Anguilla japonica, and new records of some other nematodes from inland fishes in Japan

Moravec, František; Nagasawa, Kazuya

doi:10.14411/fp.2018.016

Cited by 13 publications

(11 citation statements)

References 44 publications

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“…Morphological identification of infectious fourth stage larvae (L4) is problematic. Moravec and Nagasawa (2018) concluded that L4 stage Eustrongylides are unidentifiable to species by morphological features. In Mazzone et al (2019) , L4 E. ignotus and E .…”

Section: Discussionmentioning

confidence: 99%

Parasites of zoonotic interest in selected edible freshwater fish imported to Australia

Williams

Hernández‐Jover

Shamsi

2022

Food and Waterborne Parasitology

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Australia imports a significant amount of edible freshwater fish. The safety of the imported product is therefore of great importance. Previous research has shown that certain types of edible freshwater fish imported into Australia are not compliant with Australian importation guidelines and additionally are contaminated with many species of parasites, some of which may cause illness in humans if consumed. The present study, to the best of authors knowledge, is the first to publish the occurrence of zoonotic parasites in edible fish imported into Australia. Eustrongylides sp. Jägerskiöld, 1909 (P. 15.5%), family Dioctophymidae; Euclinostomum sp. Travassos, 1928 (P. 4.8%), family Clinostomidae, were recovered from imported edible and consumer ready Channidae fish and Isoparorchis sp. Southwell, 1913 (P. 11%), family Isoparorchiidae, from imported edible Bagridae fish. Euclinostomum sp. and Isoparorchis sp. were identified using morphological method. Molecular identification of Eustrongylides sp. was achieved through sequencing of the 18S ribosomal RNA gene sequence. Eustrongylides sp. and Isoparorchis sp. have been identified as the causative agent in cases of human infection and are a recognised zoonosis. Euclinostomum sp. is considered to have zoonotic potential and for this reason this species has been included in the importation risk assessments for freshwater fish from certain countries. This study confirmed the presence of zoonotic parasite species in edible imported fish. Whilst this fish product was frozen and parasites therefore inactivated, both fish species according to importation commodity codes, at the time this manuscript was written, are permitted entry into Australia chilled. Further study using a greater sample size is required to understand the human health risks.

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Section: Discussionmentioning

confidence: 99%

Parasites of zoonotic interest in selected edible freshwater fish imported to Australia

Williams

Hernández‐Jover

Shamsi

2022

Food and Waterborne Parasitology

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“…The taxonomic classification of the specimen was conducted based on the morphology outlined by Moravec and Justine (2020). Morphological comparisons among paracapillariid species in the subgenus Ophidiocapillaria were made using information from various sources, including Teixeira de Freitas and Lent (1934), Skryabin et al (1957), Pence (1970), Wang (1982), Biserkov et al (1985), Moravec and Gibson (1986), Moravec (1986), De (1998) and Charoennitiwat et al (2023), with reference examined specimens listed in Table S1.…”

Section: Scanning Electron Microscopy Studymentioning

confidence: 99%

Paracapillaria (Ophidiocapillaria) siamensis sp. nov. (Nematoda: Trichuroidea): a new nematode in Naja kaouthia from Thailand

Charoennitiwat,

Chaisiri,

Kanjanapruthipong

et al. 2024

Parasitology

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A comprehensive investigation, incorporating both morphological and molecular analyses, has unveiled the existence of a hitherto unknown nematode species, Paracapillaria (Ophidiocapillaria) siamensis sp. nov., residing in the intestine of the monocled cobra, Naja kaouthia, in the central region of Thailand. This study integrates morphological characteristics, morphometric examination, scanning electron microscopy and molecular phylogenetic analysis (COI, 18S rRNA and ITS1 genes). The findings place the newly described species within the subgenus Ophidiocapillaria, elucidating its distinctive characteristics, including a frame-like proximal spicule shape, approximate lengths of 19 000 and 22 500 μm with approximate widths of 90 and 130 μm for males and females, 39‒45 stichocytes, elevated lips without protrusion, a dorsal bacillary band stripe with an irregular pattern of bacillary cells and evidence of intestinal infection. These features serve to differentiate it from other species within the same subgenus, notably Paracapillaria (Ophidiocapillaria) najae De, 1998, a species coexisting P. siamensis sp. nov. in the monocled cobra from the same locality. This study addresses the co-infection of the novel species and P. najae within the same snake host, marking the second documented instance of a paracapillariid species in the monocled cobra within the family Elapidae. The genetic characterization supports the formal recognition of P. siamensis sp. nov. as a distinct species, thereby underscoring its taxonomic differentiation within the Capillariidae family. This research identifies and characterizes the new nematode species, contributing valuable insights into the taxonomy of this nematode.

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“…Many nematode species have been described in C. punctata however, there is a great deal of taxonomic confusion regarding larval nematodes identified from C. punctata in Bangladesh ( Table 1 ). It is recognised that identification of larval nematodes to a species level morphologically is not reliable ( Borges et al, 2012 ; Shamsi and Suthar, 2016a ; Moravec and Nagasawa, 2018 ; Mazzone et al, 2019 ; Abro et al, 2020 ) because most features are absent in larval specimens. Therefore, the aim of this study was to identify larval nematodes recovered from the intestinal mesentery of C. punctata (Bangladesh) using molecular methodology.…”

Section: Introductionmentioning

confidence: 99%

Genetic characterisation of Tanqua (von Linstow, 1879) (Nematoda: Gnathostomatidae) larval forms including new host and locality records

Williams

Hernández‐Jover

Hossen

et al. 2022

International Journal for Parasitology: Parasites and Wildlife

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In an unrelated study of spotted snakehead fish Channa punctata (Bloch) of family Channidae (N = 103) from Bangladesh, ten fish had taupe and clear coloured cysts attached to the intestinal mesentery. Investigation of the cysts revealed larval nematodes. The larvae were damaged and not suitable for detailed morphological study, however, key features such as tooth like projections of the pseudolabia and lateral pseudolabium were observed in specimens with undamaged cephalic regions. Molecular characterisation was undertaken and although the parasite genetic material was poor, five of the twelve nematode larvae through sequencing of the 18S ribosomal RNA gene, showed 98.17% match with sequences assigned for Tanqua tiara (accession number JF934728) deposited in GenBank. The prevalence of infection was 9.7% and the mean intensity 2.70. Tanqua has not previously been identified in fish, or from the definitive host, the Asian water monitor Varanus salvator (Laurenti, 1768) of family Varanidae (class Reptilia), in Bangladesh. Therefore, this study represents a new host and locality record for this nematode species. In many previous reports from this region, nematode larvae have been identified morphologically and assigned to a diverse range of nematode genera. Some confusion therefore exists regarding their accuracy and further investigations are required using molecular methodology to clarify the species of larval nematodes which infect edible fish in Bangladesh.

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Rhabdochona angusticaudata sp. n. (Nematoda: Rhabdochonidae) from the Japanese eel Anguilla japonica, and new records of some other nematodes from inland fishes in Japan

Cited by 13 publications

References 44 publications

Parasites of zoonotic interest in selected edible freshwater fish imported to Australia

Parasites of zoonotic interest in selected edible freshwater fish imported to Australia

Paracapillaria (Ophidiocapillaria) siamensis sp. nov. (Nematoda: Trichuroidea): a new nematode in Naja kaouthia from Thailand

Genetic characterisation of Tanqua (von Linstow, 1879) (Nematoda: Gnathostomatidae) larval forms including new host and locality records

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