{"refrec":{"BRefID":367348,"RR":"<b>Paskerova, G.G.; Miroliubova, T.S.; Valigurová, A.; Aleoshin, V.V.; Simdyanov, T.G.</b> (2023). Morphological and phylogenetic study of protococcidians sheds light on the evolution of epicellular parasitism in Sporozoa (Apicomplexa), with the description of <i>Eleutheroschizon planoratum</i> sp. nov. <i>Diversity 15(7)</i>: 863. <a href=\"https://dx.doi.org/10.3390/d15070863\" target=\"_blank\">https://dx.doi.org/10.3390/d15070863</a>","BEntID":365073,"PublicFlag":1,"CheckedFlag":0,"wosflag":1,"vabbflag":0,"RefStringPartII":" <i>Diversity 15(7)</i>: 863. <a href=\"https://dx.doi.org/10.3390/d15070863\" target=\"_blank\">https://dx.doi.org/10.3390/d15070863</a>","DocTypID":8,"DocType":"Journal article","MarineFlag":1,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Paskerova, G.G.; Miroliubova, T.S.; Valigurová, A.; Aleoshin, V.V.; Simdyanov, T.G.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Paskerova, G.G. <i>et al.</i>","Englishabstract":"The order Protococcidiida is one of the most poorly studied basal groups of Sporozoa (Apicomplexa sensu stricto). To date, the phylogenetic unity of protococcidians and their relationship with other sporozoans are understudied. Only the protococcidian <i>Eleutheroschizon duboscqi</i> has molecular evidence of a sister position to “true” coccidians (<i>Eimeria</i>, <i>Sarcocystis</i>, <i>Toxoplasma</i>). <i>E. duboscqi</i> is characterized by epicellular development in the so-called parasitophorous sac of the host cell origin. The unusual localization of <i>Eleutheroschizon</i> is comparable to that of <i>Cryptosporidium</i>. We describe a new species of the genus, <i>E. planoratum</i> ex <i>Naineris quadricuspida</i> polychaete from the White Sea, using light and electron microscopy. The morphology of attachment apparatus, phylogenetic analyses of concatenated DNA sequences of the nuclear ribosomal operon (SSU rDNA, ITS1, 5.8S rDNA, ITS2, and LSU rDNA), and compensatory base changes in ITS2 secondary structures of both protococcidians confirm the new species. The resulting phylogenies also confirm that <i>Eleutheroschizon</i> is sister to eimeriid coccidians, while <i>Cryptosporidium</i> tends to be grouped with gregarines. We discuss a new type of endoparasitism among sporozoans—the closed epicellular parasitism that evolved convergently in <i>Eleutheroschizon</i> and <i>Cryptosporidium</i>. The diagnosis of the new species and the emended diagnoses of the species <i>E. duboscqi</i> and the genus <i>Eleutheroschizon</i> are presented.","AbstractOtherLang":null,"BibLvlCode":"AS","StandardTitle":"Morphological and phylogenetic study of protococcidians sheds light on the evolution of epicellular parasitism in Sporozoa (Apicomplexa), with the description of <i>Eleutheroschizon planoratum</i> sp. nov.","OrigTitleLangCode":"en","OrigTitleLangCodeExtended":"eng","OrigTitleLangID":15,"DateLastModified":{"date":"2024-12-10 01:33:17.368041","timezone_type":1,"timezone":"+01:00"},"UserAccessRight":null,"UserAccID":null,"AuthorKeywords":"marine apicomplexans; host–parasite interactions; Cryptosporidium; Eleutheroschizonidae; Protococcidiida; polychaetes; intestinal parasites; coccidians","OtherDescriptors":null,"Notes":null,"AnaPub":2023,"MonPub":null,"DateUpdate":"2023-11-27","DateCreate":"2023-09-25","SecASFANote":null,"ConfID":null,"PeerRev":1,"VlizCoreFlag":1,"WoScode":"WOS:001038100700001","VABBcode":null,"OpenAcc":1,"DOI":"10.3390/d15070863"},"refs":null,"anarec":{"AnaID":367348,"PubliDate":2023,"Pagination":"863","XtraPublOfAnaID":null,"ISBN":null,"Volume":"15","Issue":"7","BRefMon":null,"BRefMonRR":null,"BRefXtra":null,"BRefXtraRR":null,"SerBRefID":239468,"SerRR":"Diversity. 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