Identity and Distribution of <i>Triglops metopias</i> (Teleostei, Cottidae) in the Northwestern Pacific
The Alaskan (highbrow) sculpin, <i>Triglops metopias,</i> is a rare and poorly known species with a restricted distribution in the North Pacific. This species has been previously recorded only from off the Aleutian Islands and the Gulf of Alaska, while previous records from the western N...
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2025-01-01
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| author | Artem M. Prokofiev Ilyas N. Mukhametov Olga R. Emelianova Svetlana Yu. Orlova Alexei M. Orlov |
| author_facet | Artem M. Prokofiev Ilyas N. Mukhametov Olga R. Emelianova Svetlana Yu. Orlova Alexei M. Orlov |
| author_sort | Artem M. Prokofiev |
| collection | DOAJ |
| description | The Alaskan (highbrow) sculpin, <i>Triglops metopias,</i> is a rare and poorly known species with a restricted distribution in the North Pacific. This species has been previously recorded only from off the Aleutian Islands and the Gulf of Alaska, while previous records from the western North Pacific have been controversial. The presence of <i>T. metopias</i> in the northwestern Pacific off the Kuril Islands is confirmed in the current study. Forty-one specimens were included in morphological and molecular analyses, including principal component analysis and DNA barcoding. The detailed morphological description of the Kuril Islands specimens is given. Molecular analysis inferred from the mitochondrial cytochrome <i>b</i> sequences showed no separation of this species from <i>T. pingelii</i>, although they can be distinguished by external morphology, including the use of the multivariate statistical approach. The geographical distribution of <i>T. metopias</i> in the North Pacific is discussed. This species is considered to be a recently diverged species with a disjunct distribution from the Kuril and the Aleutian Islands eastwards to the Gulf of Alaska. Despite its morphological similarity to <i>T. pingelii</i>, both species can be distinguished by a combination of meristic and morphometric characters, in particular, the wider interorbital space (10.4–22.4, mean 14.8 vs. 6.9–11.4, mean 9.2), shorter pectoral fins (18.7–24.9, mean 21.0 vs. 21.7–27.4, mean 24.1), and the on average more numerous oblique dermal folds (92 vs. 54). |
| format | Article |
| id | doaj-art-d05abe2f631642ebbe78dde30eaac569 |
| institution | Kabale University |
| issn | 2077-1312 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Journal of Marine Science and Engineering |
| spelling | doaj-art-d05abe2f631642ebbe78dde30eaac5692025-01-24T13:37:09ZengMDPI AGJournal of Marine Science and Engineering2077-13122025-01-0113118210.3390/jmse13010182Identity and Distribution of <i>Triglops metopias</i> (Teleostei, Cottidae) in the Northwestern PacificArtem M. Prokofiev0Ilyas N. Mukhametov1Olga R. Emelianova2Svetlana Yu. Orlova3Alexei M. Orlov4Laboratory of Ecology of Aquatic Communities and Invasions, A.N. Severtsov Institute of Ecology and Evolution, Russian Academy of Sciences, 119071 Moscow, RussiaMarine Fish Sector of the Marine and Freshwater Fish Laboratory, Sakhalin Branch, Russian Federal Research Institute of Fisheries and Oceanography, 693023 Yuzhno-Saklainsk, RussiaLaboratory of Genetic Basis of Identification, Vavilov Institute of General Genetics, Russian Academy of Sciences, 119333 Moscow, RussiaLaboratory of Genetic Basis of Identification, Vavilov Institute of General Genetics, Russian Academy of Sciences, 119333 Moscow, RussiaLaboratory of Oceanic Ichthyofauna, Shirshov Institute of Oceanology, Russian Academy of Sciences, 117218 Moscow, RussiaThe Alaskan (highbrow) sculpin, <i>Triglops metopias,</i> is a rare and poorly known species with a restricted distribution in the North Pacific. This species has been previously recorded only from off the Aleutian Islands and the Gulf of Alaska, while previous records from the western North Pacific have been controversial. The presence of <i>T. metopias</i> in the northwestern Pacific off the Kuril Islands is confirmed in the current study. Forty-one specimens were included in morphological and molecular analyses, including principal component analysis and DNA barcoding. The detailed morphological description of the Kuril Islands specimens is given. Molecular analysis inferred from the mitochondrial cytochrome <i>b</i> sequences showed no separation of this species from <i>T. pingelii</i>, although they can be distinguished by external morphology, including the use of the multivariate statistical approach. The geographical distribution of <i>T. metopias</i> in the North Pacific is discussed. This species is considered to be a recently diverged species with a disjunct distribution from the Kuril and the Aleutian Islands eastwards to the Gulf of Alaska. Despite its morphological similarity to <i>T. pingelii</i>, both species can be distinguished by a combination of meristic and morphometric characters, in particular, the wider interorbital space (10.4–22.4, mean 14.8 vs. 6.9–11.4, mean 9.2), shorter pectoral fins (18.7–24.9, mean 21.0 vs. 21.7–27.4, mean 24.1), and the on average more numerous oblique dermal folds (92 vs. 54).https://www.mdpi.com/2077-1312/13/1/182bottom fishsculpintaxonomycytochrome <i>b</i>principal component analysiszoogeography |
| spellingShingle | Artem M. Prokofiev Ilyas N. Mukhametov Olga R. Emelianova Svetlana Yu. Orlova Alexei M. Orlov Identity and Distribution of <i>Triglops metopias</i> (Teleostei, Cottidae) in the Northwestern Pacific Journal of Marine Science and Engineering bottom fish sculpin taxonomy cytochrome <i>b</i> principal component analysis zoogeography |
| title | Identity and Distribution of <i>Triglops metopias</i> (Teleostei, Cottidae) in the Northwestern Pacific |
| title_full | Identity and Distribution of <i>Triglops metopias</i> (Teleostei, Cottidae) in the Northwestern Pacific |
| title_fullStr | Identity and Distribution of <i>Triglops metopias</i> (Teleostei, Cottidae) in the Northwestern Pacific |
| title_full_unstemmed | Identity and Distribution of <i>Triglops metopias</i> (Teleostei, Cottidae) in the Northwestern Pacific |
| title_short | Identity and Distribution of <i>Triglops metopias</i> (Teleostei, Cottidae) in the Northwestern Pacific |
| title_sort | identity and distribution of i triglops metopias i teleostei cottidae in the northwestern pacific |
| topic | bottom fish sculpin taxonomy cytochrome <i>b</i> principal component analysis zoogeography |
| url | https://www.mdpi.com/2077-1312/13/1/182 |
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