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They colonize various substrates, from seaweed to terrestrial environments, utilizing ectoplasmic networks for nutrient absorption. This study characterized a novel\n                    <jats:italic>Labyrinthula<\/jats:italic>\n                    strain associated with the marine diatom\n                    <jats:italic>Biddulphia<\/jats:italic>\n                    . Phylogenetic analysis of the full\u2010length 18S rRNA gene positioned this strain as a new species,\n                    <jats:italic>Labyrinthula merlionensis<\/jats:italic>\n                    sp. nov. Scanning electron and light microscopy observations revealed bi\u2010flagellated zoospores and spindle\u2010shaped vegetative cells with ectoplasmic networks. Time\u2010series observations of the interactions between\n                    <jats:italic>L. merlionensis<\/jats:italic>\n                    and\n                    <jats:italic>Biddulphia<\/jats:italic>\n                    were categorized into different phases: establishment, infection, and aggregation. Scanning electron and confocal microscopy observations during the infection phase established the use of ectoplasmic nets to target the marginal ridge regions between diatoms, and the detection of labyrinthulid cells within diatom frustules. These findings enhance the understanding of the diversity, morphology, and ecological roles of Labyrinthulomycetes, particularly their intra\u2010 and extra\u2010cellular interactions with diatom hosts.\n                  <\/jats:p>","DOI":"10.1111\/jeu.70111","type":"journal-article","created":{"date-parts":[[2026,8,5]],"date-time":"2026-08-05T10:35:44Z","timestamp":1785926144000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["<i>Labyrinthula merlionensis<\/i>\n                    sp. nov.: A Novel Labyrinthulid Infecting Marine Diatoms"],"prefix":"10.1111","volume":"73","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-2190-7261","authenticated-orcid":false,"given":"Clarence Wei Hung","family":"Sim","sequence":"first","affiliation":[{"name":"Asian School of the Environment Nanyang Technological University  Singapore Singapore"},{"name":"Singapore Centre for Environmental Life Sciences Engineering Nanyang Technological University  Singapore Singapore"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4071-7677","authenticated-orcid":false,"given":"Marie","family":"Walde","sequence":"additional","affiliation":[{"name":"Sorbonne Universit\u00e9 CNRS, UMR7144, Team ECOMAP, Station Biologique de Roscoff  Roscoff France"},{"name":"Sorbonne Universit\u00e9 CNRS, FR2424, Roscoff Culture Collection, Station Biologique de Roscoff  Roscoff France"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hanna","family":"Strindberg","sequence":"additional","affiliation":[{"name":"Department of Biosciences University of Oslo  Oslo Norway"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Avneet","family":"Kaur","sequence":"additional","affiliation":[{"name":"Asian School of the Environment Nanyang Technological University  Singapore Singapore"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Sophie","family":"Le Panse","sequence":"additional","affiliation":[{"name":"Sorbonne Universit\u00e9 CNRS, FR2424, Plateforme Merimage, Station Biologique de Roscoff  Roscoff France"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0408-4988","authenticated-orcid":false,"given":"Priscillia","family":"Gourvil","sequence":"additional","affiliation":[{"name":"Sorbonne Universit\u00e9 CNRS, FR2424, Roscoff Culture Collection, Station Biologique de Roscoff  Roscoff France"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jens","family":"Jahren","sequence":"additional","affiliation":[{"name":"Department of Geosciences University of Oslo  Oslo Norway"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0717-5685","authenticated-orcid":false,"given":"Daniel","family":"Vaulot","sequence":"additional","affiliation":[{"name":"Sorbonne Universit\u00e9 CNRS, UMR7144, Team ECOMAP, Station Biologique de Roscoff  Roscoff France"},{"name":"Department of Biosciences University of Oslo  Oslo Norway"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0736-4937","authenticated-orcid":false,"given":"Adriana","family":"Lopes dos Santos","sequence":"additional","affiliation":[{"name":"Asian School of the Environment Nanyang Technological University  Singapore Singapore"},{"name":"Department of Biosciences University of Oslo  Oslo Norway"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2026,8,5]]},"reference":[{"key":"e_1_2_10_2_1","doi-asserted-by":"publisher","DOI":"10.1111\/jeu.12691"},{"key":"e_1_2_10_3_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1550\u20107408.1968.tb02172.x"},{"key":"e_1_2_10_4_1","doi-asserted-by":"publisher","DOI":"10.1111\/jpy.12131"},{"key":"e_1_2_10_5_1","doi-asserted-by":"publisher","DOI":"10.1111\/1462\u20102920.15709"},{"key":"e_1_2_10_6_1","first-page":"1","volume-title":"Handbook of the Protists","author":"Bennett R. 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