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Here, we report a new katablepharid species,\n                    <jats:italic>Katablepharis ulleungensis<\/jats:italic>\n                    sp. nov., isolated from a black sandy beach in Ulleung\u2010do, South Korea. The stock strain was co\u2010cultured with a small bicosoecid flagellate, serving as its prey. Cells were oblong, displayed two rows of Type I ejectisomes, and possessed two subapically inserted flagella with the posterior flagellum slightly longer than the anterior one. Rather than exhibiting linear or spiral locomotion, cells rotated in place using both flagella. Transmission and scanning electron microscopy revealed two types of ejectisomes, each consisting of two coiled ribbons. The feeding apparatus, situated at the cell apex, comprised a cytostome, 9\u201310 cytopharyngeal rings, numerous putative enzymatic vesicles, and inner microtubular arrays. Phylogenetic analyses using 18S rRNA gene placed the isolate within the genus\n                    <jats:italic>Katablepharis<\/jats:italic>\n                    ; the phylogenetic placement together with distinct morphological characteristics supports its recognition as a new species. Using Illumina data, the complete mitochondrial genome (35,191\u2009bp) was assembled and annotated to contain 60 genes, including 33 protein\u2010coding genes, 25 tRNAs, and 2 rRNAs. This study expands our understanding of katablepharid diversity and contributes to mitochondrial genome resources for marine protists.\n                  <\/jats:p>","DOI":"10.1111\/jeu.70126","type":"journal-article","created":{"date-parts":[[2026,10,8]],"date-time":"2026-10-08T05:14:50Z","timestamp":1791436490000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Morphological, Molecular Phylogenetic, and Mitochondrial Genome Characterization of a Deep\u2010Branching Marine Flagellate,\n                    <i>Katablepharis ulleungensis<\/i>\n                    sp. nov. (Cryptista)"],"prefix":"10.1111","volume":"73","author":[{"ORCID":"https:\/\/orcid.org\/0009-0003-3206-2193","authenticated-orcid":false,"given":"Yasinee","family":"Phanprasert","sequence":"first","affiliation":[{"name":"Division of EcoScience Ewha Womans University  Seoul South Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3985-3284","authenticated-orcid":false,"given":"Hyeon Been","family":"Lee","sequence":"additional","affiliation":[{"name":"Department of Oceanography Kyungpook National University  Daegu Republic of Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3070-0414","authenticated-orcid":false,"given":"Jong Im","family":"Kim","sequence":"additional","affiliation":[{"name":"Department of Biology Chungnam National University  Daejeon South Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5175-648X","authenticated-orcid":false,"given":"Sun Young","family":"Kim","sequence":"additional","affiliation":[{"name":"Department of Taxonomy and Systematics National Marine Biodiversity Institute of Korea  Seocheon\u2010gun South Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0007-1370-2473","authenticated-orcid":false,"given":"Ophelie Marie","family":"Lamothe","sequence":"additional","affiliation":[{"name":"Division of EcoScience Ewha Womans University  Seoul South Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5451-8647","authenticated-orcid":false,"given":"Nam Seon","family":"Kang","sequence":"additional","affiliation":[{"name":"Department of Taxonomy and Systematics National Marine Biodiversity Institute of Korea  Seocheon\u2010gun South Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1165-4205","authenticated-orcid":false,"given":"Dong Hyuk","family":"Jeong","sequence":"additional","affiliation":[{"name":"Department of Oceanography Kyungpook National University  Daegu Republic of Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6253-5199","authenticated-orcid":false,"given":"Jong Soo","family":"Park","sequence":"additional","affiliation":[{"name":"Department of Oceanography Kyungpook National University  Daegu Republic of Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6691-8461","authenticated-orcid":false,"given":"Eunsoo","family":"Kim","sequence":"additional","affiliation":[{"name":"Division of EcoScience Ewha Womans University  Seoul South Korea"},{"name":"Division of Invertebrate Zoology American Museum of Natural History  New York New York USA"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2026,10,7]]},"reference":[{"key":"e_1_2_9_2_1","doi-asserted-by":"crossref","first-page":"4","DOI":"10.1111\/jeu.12691","article-title":"Revisions to the Classification, Nomenclature, and Diversity of Eukaryotes","volume":"66","author":"Adl S. 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