Hidden in the fog: Morphological and molecular characterisation of Derogenes varicus sensu stricto (Trematoda, Derogenidae) from Sweden and Norway, and redescription of two poorly known Derogenes species
Derogenes varicus (Müller, 1784) is widely reported as a trematode with exceptionally low host specificity and a wide, bipolar distribution. However, several recent studies have suggested that D. varicus represents a species complex and based on molecular evidence, four genetic lineages (labeled as...
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EDP Sciences
2023
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Online Access: | https://hdl.handle.net/11250/3145597 https://doi.org/10.1051/parasite/2023030 |
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ftunivbergen:oai:bora.uib.no:11250/3145597 2024-09-15T17:56:35+00:00 Hidden in the fog: Morphological and molecular characterisation of Derogenes varicus sensu stricto (Trematoda, Derogenidae) from Sweden and Norway, and redescription of two poorly known Derogenes species Bouguerche, Chahinez Huston, Daniel C. Cribb, Thomas H. Karlsbakk, Egil Erlingsson Ahmed, Mohammed Holovachov, Oleksandr 2023 application/pdf https://hdl.handle.net/11250/3145597 https://doi.org/10.1051/parasite/2023030 eng eng EDP Sciences urn:issn:1252-607X https://hdl.handle.net/11250/3145597 https://doi.org/10.1051/parasite/2023030 cristin:2189045 Parasite. 2023, 30, 35. Navngivelse 4.0 Internasjonal http://creativecommons.org/licenses/by/4.0/deed.no Copyright 2023 The Author(s) 35 Parasite 30 Journal article Peer reviewed 2023 ftunivbergen https://doi.org/10.1051/parasite/2023030 2024-08-13T23:41:38Z Derogenes varicus (Müller, 1784) is widely reported as a trematode with exceptionally low host specificity and a wide, bipolar distribution. However, several recent studies have suggested that D. varicus represents a species complex and based on molecular evidence, four genetic lineages (labeled as “DV1–4”) have been designated within the D. varicus species complex. This possibility requires improved (ideally molecular) characterisation of specimens from the type-host (Salmo salar) and type-locality (off Denmark). During examination of trematode parasites of fish from Scandinavian and Arctic waters (Sweden and Norway), we found specimens of D. varicus in the stomach of Merlangius merlangus off the coast of Sweden, and in Gadus morhua off the coast of Sweden and Norway; we compared them to D. varicus from the type-host, the Atlantic salmon Salmo salar from Norway, to verify their conspecificity. Newly generated sequences (28S rDNA, ITS2 and cox1) of Scandinavian and Arctic specimens consistent with D. varicus all formed a single clade, DV1. 28S sequences of D. varicus from S. salar from Norway, i.e., close to the Danish type locality, clustered within the DV1 clade along with sequences of D. varicus from various hosts including Limanda limanda, G. morhua and Myoxocephalus scorpius from the White Sea and the Barents Sea (Russia), without any host-related structuring. We thus consider that the lineage DV1 represents D. varicus sensu stricto. Additionally, specimens from M. merlangus had a similar morphology and anatomy to those of D. varicus from L. limanda, G. morhua and M. scorpius from T. Odhner’s collection, supporting the presence of a single species in the DV1 lineage designated herein as D. varicus sensu stricto. We redescribe D. varicus sensu stricto, add new morphological characters and provide morphometric data. We infer that D. varicus types DV2–4 all relate to separate species. We also revise type-specimens of Derogenes minor Looss, 1901 from the A. Looss collection in the Swedish Museum of Natural ... Article in Journal/Newspaper Atlantic salmon Barents Sea Gadus morhua Salmo salar White Sea University of Bergen: Bergen Open Research Archive (BORA-UiB) Parasite 30 35 |
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Open Polar |
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University of Bergen: Bergen Open Research Archive (BORA-UiB) |
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ftunivbergen |
language |
English |
description |
Derogenes varicus (Müller, 1784) is widely reported as a trematode with exceptionally low host specificity and a wide, bipolar distribution. However, several recent studies have suggested that D. varicus represents a species complex and based on molecular evidence, four genetic lineages (labeled as “DV1–4”) have been designated within the D. varicus species complex. This possibility requires improved (ideally molecular) characterisation of specimens from the type-host (Salmo salar) and type-locality (off Denmark). During examination of trematode parasites of fish from Scandinavian and Arctic waters (Sweden and Norway), we found specimens of D. varicus in the stomach of Merlangius merlangus off the coast of Sweden, and in Gadus morhua off the coast of Sweden and Norway; we compared them to D. varicus from the type-host, the Atlantic salmon Salmo salar from Norway, to verify their conspecificity. Newly generated sequences (28S rDNA, ITS2 and cox1) of Scandinavian and Arctic specimens consistent with D. varicus all formed a single clade, DV1. 28S sequences of D. varicus from S. salar from Norway, i.e., close to the Danish type locality, clustered within the DV1 clade along with sequences of D. varicus from various hosts including Limanda limanda, G. morhua and Myoxocephalus scorpius from the White Sea and the Barents Sea (Russia), without any host-related structuring. We thus consider that the lineage DV1 represents D. varicus sensu stricto. Additionally, specimens from M. merlangus had a similar morphology and anatomy to those of D. varicus from L. limanda, G. morhua and M. scorpius from T. Odhner’s collection, supporting the presence of a single species in the DV1 lineage designated herein as D. varicus sensu stricto. We redescribe D. varicus sensu stricto, add new morphological characters and provide morphometric data. We infer that D. varicus types DV2–4 all relate to separate species. We also revise type-specimens of Derogenes minor Looss, 1901 from the A. Looss collection in the Swedish Museum of Natural ... |
format |
Article in Journal/Newspaper |
author |
Bouguerche, Chahinez Huston, Daniel C. Cribb, Thomas H. Karlsbakk, Egil Erlingsson Ahmed, Mohammed Holovachov, Oleksandr |
spellingShingle |
Bouguerche, Chahinez Huston, Daniel C. Cribb, Thomas H. Karlsbakk, Egil Erlingsson Ahmed, Mohammed Holovachov, Oleksandr Hidden in the fog: Morphological and molecular characterisation of Derogenes varicus sensu stricto (Trematoda, Derogenidae) from Sweden and Norway, and redescription of two poorly known Derogenes species |
author_facet |
Bouguerche, Chahinez Huston, Daniel C. Cribb, Thomas H. Karlsbakk, Egil Erlingsson Ahmed, Mohammed Holovachov, Oleksandr |
author_sort |
Bouguerche, Chahinez |
title |
Hidden in the fog: Morphological and molecular characterisation of Derogenes varicus sensu stricto (Trematoda, Derogenidae) from Sweden and Norway, and redescription of two poorly known Derogenes species |
title_short |
Hidden in the fog: Morphological and molecular characterisation of Derogenes varicus sensu stricto (Trematoda, Derogenidae) from Sweden and Norway, and redescription of two poorly known Derogenes species |
title_full |
Hidden in the fog: Morphological and molecular characterisation of Derogenes varicus sensu stricto (Trematoda, Derogenidae) from Sweden and Norway, and redescription of two poorly known Derogenes species |
title_fullStr |
Hidden in the fog: Morphological and molecular characterisation of Derogenes varicus sensu stricto (Trematoda, Derogenidae) from Sweden and Norway, and redescription of two poorly known Derogenes species |
title_full_unstemmed |
Hidden in the fog: Morphological and molecular characterisation of Derogenes varicus sensu stricto (Trematoda, Derogenidae) from Sweden and Norway, and redescription of two poorly known Derogenes species |
title_sort |
hidden in the fog: morphological and molecular characterisation of derogenes varicus sensu stricto (trematoda, derogenidae) from sweden and norway, and redescription of two poorly known derogenes species |
publisher |
EDP Sciences |
publishDate |
2023 |
url |
https://hdl.handle.net/11250/3145597 https://doi.org/10.1051/parasite/2023030 |
genre |
Atlantic salmon Barents Sea Gadus morhua Salmo salar White Sea |
genre_facet |
Atlantic salmon Barents Sea Gadus morhua Salmo salar White Sea |
op_source |
35 Parasite 30 |
op_relation |
urn:issn:1252-607X https://hdl.handle.net/11250/3145597 https://doi.org/10.1051/parasite/2023030 cristin:2189045 Parasite. 2023, 30, 35. |
op_rights |
Navngivelse 4.0 Internasjonal http://creativecommons.org/licenses/by/4.0/deed.no Copyright 2023 The Author(s) |
op_doi |
https://doi.org/10.1051/parasite/2023030 |
container_title |
Parasite |
container_volume |
30 |
container_start_page |
35 |
_version_ |
1810432770766274560 |