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The genus\n                    <jats:italic>Plagiotremus<\/jats:italic>\n                    contains 11 species distributed across the Indo\u2010Pacific and Red Sea, including two nominal species endemic to Hawai'i. Here, we use mitochondrial COI and cytb in addition to select morphological characters to examine the relationships of Hawaiian endemics to their widely distributed sister species, along with their phylogeography and evolutionary relationships above and below the species level. The Hawaiian endemic\n                    <jats:italic>P. ewaensis<\/jats:italic>\n                    was fully diverged from the widespread\n                    <jats:italic>P. rhinorhynchos<\/jats:italic>\n                    at COI (~4.5%), with genetic diversity patterns suggesting the possibility of a Hawaiian origin for the species pair. In contrast, the endemic\n                    <jats:italic>P. goslinei<\/jats:italic>\n                    was polyphyletic with the widespread\n                    <jats:italic>P. tapeinosoma<\/jats:italic>\n                    , sharing several haplotypes in both COI and cytb and indicating recent\/ongoing contact and population\u2010level separation. The Marquesan population of\n                    <jats:italic>P. tapeinosoma<\/jats:italic>\n                    was morphologically and genetically distinct and ~1.7%\u20132.9% divergent from all other groups, and may warrant elevation to species. The\n                    <jats:italic>P. goslinei<\/jats:italic>\n                    \/\n                    <jats:italic>tapeinosoma<\/jats:italic>\n                    group showed significant population differentiation across the Indo\u2010Pacific (COI \u03a6\n                    <jats:sub>st<\/jats:sub>\n                    \u2009=\u20090.786,\n                    <jats:italic>p<\/jats:italic>\n                    \u2009&lt;\u20090.001, cytb \u03a6\n                    <jats:sub>st<\/jats:sub>\n                    \u2009=\u20090.801,\n                    <jats:italic>p<\/jats:italic>\n                    \u2009&lt;\u20090.001), although this was largely driven by the Hawaiian and Marquesan populations. In contrast, the\n                    <jats:italic>ewaensis<\/jats:italic>\n                    \/\n                    <jats:italic>rhinorhynchos<\/jats:italic>\n                    group showed low non\u2010significant differentiation (COI \u03a6\n                    <jats:sub>st<\/jats:sub>\n                    \u2009=\u20090.073,\n                    <jats:italic>p<\/jats:italic>\n                    \u2009=\u20090.06) with one frequent COI haplotype shared within\n                    <jats:italic>P. rhinorhynchos<\/jats:italic>\n                    across the Indo\u2010Pacific. Ancestral reconstruction analyses of\n                    <jats:italic>P. goslinei<\/jats:italic>\n                    \/\n                    <jats:italic>tapeinosoma<\/jats:italic>\n                    \/\n                    <jats:italic>azaleus<\/jats:italic>\n                    invoke the tantalizing possibility of an East Pacific origin for the species group. Our findings provide further support for biodiversity feedback in the Indo\u2010Pacific and show that endemic Hawaiian species with widely distributed sister taxa may have dramatically different evolutionary histories.\n                  <\/jats:p>","DOI":"10.1111\/jfb.70614","type":"journal-article","created":{"date-parts":[[2026,8,17]],"date-time":"2026-08-17T00:54:33Z","timestamp":1786928073000},"page":"2394-2408","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Origins and relationships of endemic Hawaiian sabre\u2010toothed blennies in the genus\n                    <i>Plagiotremus<\/i>\n                    (Blennioidei: Blenniidae)"],"prefix":"10.1111","volume":"109","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-2514-3599","authenticated-orcid":false,"given":"Mykle L.","family":"Hoban","sequence":"first","affiliation":[{"name":"Hawai'i Institute of Marine Biology  K\u0101ne'ohe Hawai'i USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9567-6721","authenticated-orcid":false,"given":"Cameron A. J.","family":"Walsh","sequence":"additional","affiliation":[{"name":"Hawai'i Institute of Marine Biology  K\u0101ne'ohe Hawai'i USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1363-5702","authenticated-orcid":false,"given":"Randall K.","family":"Kosaki","sequence":"additional","affiliation":[{"name":"Papah\u0101naumoku\u0101kea National Marine Sanctuary National Oceanic and Atmospheric Administration  Honolulu Hawai'i USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Brian W.","family":"Bowen","sequence":"additional","affiliation":[{"name":"Hawai'i Institute of Marine Biology  K\u0101ne'ohe Hawai'i USA"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2026,8,16]]},"reference":[{"key":"e_1_2_11_2_1","unstructured":"Aboyoun P. 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