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Using morphological and molecular data, a new coccidia species, <jats:bold>\n              <jats:italic>Eimeria koka<\/jats:italic>\n            <\/jats:bold>\n            <jats:bold> n. sp.<\/jats:bold>, isolated from two closely related but geographically isolated kiwi host species, <jats:italic>Apteryx rowi<\/jats:italic> Tennyson et al. (rowi) and <jats:italic>Apteryx mantelli<\/jats:italic> Bartlett (North Island brown kiwi), is described. Oocysts are oval (20.8 \u00d7 15.9 \u03bcm) with a mean L\/W ratio of 1.3, and a distinctive rough, crenellated brown oocyst wall (mean 1.2 \u03bcm), an oocyst residuum, 1\u20132 polar granules, and no micropyle. Sporocysts are ellipsoidal (11.6 \u00d7 6.3 \u03bcm) with a Stieda body and sporocyst residuum. Phylogenetic analysis of the cytochrome C oxidase subunit 1 (CO1) placed <jats:bold>\n              <jats:italic>E. koka<\/jats:italic>\n            <\/jats:bold>\n            <jats:bold> n. sp.<\/jats:bold> in a separate clade to other <jats:italic>Eimeria<\/jats:italic> species previously identified from kiwi (Coker et al., Syst Parasitol 100(3):269\u2013281, 2023). Comparison of DNA from oocysts with infected tissues from a single juvenile North Island brown kiwi confirmed parasitism of the kidney and lung tissues. This is the first <jats:italic>Eimeria<\/jats:italic> species identified from extraintestinal tissues in kiwi. Further molecular studies are recommended to determine the tissue distribution of <jats:italic>E. koka<\/jats:italic>\n            <jats:bold>n. sp.<\/jats:bold> and other <jats:italic>Eimeria<\/jats:italic> species in kiwi.<\/jats:p>","DOI":"10.1007\/s11230-025-10227-x","type":"journal-article","created":{"date-parts":[[2025,4,9]],"date-time":"2025-04-09T14:22:21Z","timestamp":1744208541000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":4,"title":["Morphological and molecular description of a novel species of Eimeria (Apicomplexa) that infects extraintestinal tissues of kiwi (Aves: Apteryx spp.)"],"prefix":"10.1007","volume":"102","author":[{"ORCID":"https:\/\/orcid.org\/0009-0003-2090-8657","authenticated-orcid":false,"given":"Emma","family":"Scheltema","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1332-0359","authenticated-orcid":false,"given":"Kerri","family":"Morgan","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2323-3336","authenticated-orcid":false,"given":"Preet","family":"Singh","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Barbara","family":"Adlington","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2594-2008","authenticated-orcid":false,"given":"Laryssa","family":"Howe","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"297","published-online":{"date-parts":[[2025,4,9]]},"reference":[{"issue":"2","key":"10227_CR1","doi-asserted-by":"publisher","first-page":"119","DOI":"10.1038\/ng0294-119","volume":"6","author":"SF Altschul","year":"1994","unstructured":"Altschul, Stephen F., Boguski, Mark S., Gish, Warren, & Wootton, John C. 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