Studies of Myxidium giardi Cépède, 1906 infections in Icelandic eels identifies a genetically diverse clade of myxosporeans that represents the Paramyxidium n. g. (Myxosporea: Myxidiidae)
Abstract Background The myxosporean Myxidium giardi Cépède, 1906 was described infecting the kidney of the European eel, Anguilla anguilla (L.), having spindle-shaped myxospores and terminal sub-spherical polar capsules. Since then, numerous anguillid eels globally have been documented to have simil...
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ftdoajarticles:oai:doaj.org/article:f0b2cff462344823b0c041209d110a3e 2023-05-15T13:28:19+02:00 Studies of Myxidium giardi Cépède, 1906 infections in Icelandic eels identifies a genetically diverse clade of myxosporeans that represents the Paramyxidium n. g. (Myxosporea: Myxidiidae) Mark A. Freeman Árni Kristmundsson 2018-10-01T00:00:00Z https://doi.org/10.1186/s13071-018-3087-y https://doaj.org/article/f0b2cff462344823b0c041209d110a3e EN eng BMC http://link.springer.com/article/10.1186/s13071-018-3087-y https://doaj.org/toc/1756-3305 doi:10.1186/s13071-018-3087-y 1756-3305 https://doaj.org/article/f0b2cff462344823b0c041209d110a3e Parasites & Vectors, Vol 11, Iss 1, Pp 1-13 (2018) Paramyxidium n. g Paramyxidium giardi n. comb Elopomorpha Protacanthopterygii Myxosporea Chloromyxum Infectious and parasitic diseases RC109-216 article 2018 ftdoajarticles https://doi.org/10.1186/s13071-018-3087-y 2022-12-31T06:03:17Z Abstract Background The myxosporean Myxidium giardi Cépède, 1906 was described infecting the kidney of the European eel, Anguilla anguilla (L.), having spindle-shaped myxospores and terminal sub-spherical polar capsules. Since then, numerous anguillid eels globally have been documented to have similar Myxidium infections. Many of these have been identified using the morphological features of myxospores or by the location of infection in the host, and some have been subsequently synonymised with M. giardi. Therefore, it is not clear whether M. giardi is a widely distributed parasite, infecting numerous species of eels, in multiple organs, or whether some infections represent other, morphologically similar but different species of myxosporeans. The aim of the present study was to assess the status of M. giardi infections in Icelandic eels, and related fish hosts in Malaysia and to use spore morphology and molecular techniques to evaluate the diversity of myxosporeans present. Results The morphologies of the myxospores from Icelandic eels were very similar but the overall dimensions were significantly different from the various tissue locations. Myxospores from the kidney of the Malaysian tarpon, Megalops cyprinoides (Broussonet), were noticeably smaller. However, the SSU rDNA sequences from the different tissues locations in eels, were all very distinct, with percentage similarities ranging from 92.93% to as low as 89.8%, with the sequence from Malaysia being even more dissimilar. Molecular phylogenies consistently placed these sequences together in a clade that we refer to as the Paramyxidium clade that is strongly associated with the Myxidium clade (sensu stricto). We erect the genus Paramyxidium n. g. (Myxidiidae) to accommodate these histozoic taxa, and transfer Myxidium giardi as Paramyxidium giardi Cépède, 1906 n. comb. as the type-species. Conclusions There is not a single species of Myxidium (M. giardi) causing systemic infections in eels in Iceland. There are three species, confirmed with a robust ... Article in Journal/Newspaper Anguilla anguilla European eel Iceland Directory of Open Access Journals: DOAJ Articles Parasites & Vectors 11 1 |
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Directory of Open Access Journals: DOAJ Articles |
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English |
topic |
Paramyxidium n. g Paramyxidium giardi n. comb Elopomorpha Protacanthopterygii Myxosporea Chloromyxum Infectious and parasitic diseases RC109-216 |
spellingShingle |
Paramyxidium n. g Paramyxidium giardi n. comb Elopomorpha Protacanthopterygii Myxosporea Chloromyxum Infectious and parasitic diseases RC109-216 Mark A. Freeman Árni Kristmundsson Studies of Myxidium giardi Cépède, 1906 infections in Icelandic eels identifies a genetically diverse clade of myxosporeans that represents the Paramyxidium n. g. (Myxosporea: Myxidiidae) |
topic_facet |
Paramyxidium n. g Paramyxidium giardi n. comb Elopomorpha Protacanthopterygii Myxosporea Chloromyxum Infectious and parasitic diseases RC109-216 |
description |
Abstract Background The myxosporean Myxidium giardi Cépède, 1906 was described infecting the kidney of the European eel, Anguilla anguilla (L.), having spindle-shaped myxospores and terminal sub-spherical polar capsules. Since then, numerous anguillid eels globally have been documented to have similar Myxidium infections. Many of these have been identified using the morphological features of myxospores or by the location of infection in the host, and some have been subsequently synonymised with M. giardi. Therefore, it is not clear whether M. giardi is a widely distributed parasite, infecting numerous species of eels, in multiple organs, or whether some infections represent other, morphologically similar but different species of myxosporeans. The aim of the present study was to assess the status of M. giardi infections in Icelandic eels, and related fish hosts in Malaysia and to use spore morphology and molecular techniques to evaluate the diversity of myxosporeans present. Results The morphologies of the myxospores from Icelandic eels were very similar but the overall dimensions were significantly different from the various tissue locations. Myxospores from the kidney of the Malaysian tarpon, Megalops cyprinoides (Broussonet), were noticeably smaller. However, the SSU rDNA sequences from the different tissues locations in eels, were all very distinct, with percentage similarities ranging from 92.93% to as low as 89.8%, with the sequence from Malaysia being even more dissimilar. Molecular phylogenies consistently placed these sequences together in a clade that we refer to as the Paramyxidium clade that is strongly associated with the Myxidium clade (sensu stricto). We erect the genus Paramyxidium n. g. (Myxidiidae) to accommodate these histozoic taxa, and transfer Myxidium giardi as Paramyxidium giardi Cépède, 1906 n. comb. as the type-species. Conclusions There is not a single species of Myxidium (M. giardi) causing systemic infections in eels in Iceland. There are three species, confirmed with a robust ... |
format |
Article in Journal/Newspaper |
author |
Mark A. Freeman Árni Kristmundsson |
author_facet |
Mark A. Freeman Árni Kristmundsson |
author_sort |
Mark A. Freeman |
title |
Studies of Myxidium giardi Cépède, 1906 infections in Icelandic eels identifies a genetically diverse clade of myxosporeans that represents the Paramyxidium n. g. (Myxosporea: Myxidiidae) |
title_short |
Studies of Myxidium giardi Cépède, 1906 infections in Icelandic eels identifies a genetically diverse clade of myxosporeans that represents the Paramyxidium n. g. (Myxosporea: Myxidiidae) |
title_full |
Studies of Myxidium giardi Cépède, 1906 infections in Icelandic eels identifies a genetically diverse clade of myxosporeans that represents the Paramyxidium n. g. (Myxosporea: Myxidiidae) |
title_fullStr |
Studies of Myxidium giardi Cépède, 1906 infections in Icelandic eels identifies a genetically diverse clade of myxosporeans that represents the Paramyxidium n. g. (Myxosporea: Myxidiidae) |
title_full_unstemmed |
Studies of Myxidium giardi Cépède, 1906 infections in Icelandic eels identifies a genetically diverse clade of myxosporeans that represents the Paramyxidium n. g. (Myxosporea: Myxidiidae) |
title_sort |
studies of myxidium giardi cépède, 1906 infections in icelandic eels identifies a genetically diverse clade of myxosporeans that represents the paramyxidium n. g. (myxosporea: myxidiidae) |
publisher |
BMC |
publishDate |
2018 |
url |
https://doi.org/10.1186/s13071-018-3087-y https://doaj.org/article/f0b2cff462344823b0c041209d110a3e |
genre |
Anguilla anguilla European eel Iceland |
genre_facet |
Anguilla anguilla European eel Iceland |
op_source |
Parasites & Vectors, Vol 11, Iss 1, Pp 1-13 (2018) |
op_relation |
http://link.springer.com/article/10.1186/s13071-018-3087-y https://doaj.org/toc/1756-3305 doi:10.1186/s13071-018-3087-y 1756-3305 https://doaj.org/article/f0b2cff462344823b0c041209d110a3e |
op_doi |
https://doi.org/10.1186/s13071-018-3087-y |
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Parasites & Vectors |
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11 |
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