"The first data on ribosome operon sequence (18S+ITS1+5.8S+ITS2+28S) of the archigregarine Selenidium sp., an intestine parasite of spionid polychetes Pygospio elegans and Polydora glycimerica, are obtained. Archigregarines are the most plesiomorphic group of sporozoan Apicomplexa: their mature gamonts and even syzygy retain a set of features, which are characteristic just for infection stages (sporo- and merozoites) of other sporozoans (apical complex of organelles consisting of conoid, polar ring, and rhoptry-micronemal system). According to molecular phylogenetic studies of archigregarine 18S rDNA performed by B. S. Leander et al., they form four branches (including two extremely long ones) hardly grouping to one another and keeping uncertain positions within Apicomplexa. The samples of Selenidium sp. from the White Sea (from P. elegans) and Sea of Japan (from P. glycimerica) have been studied." . "1"^^ . . . "The first data on ribosome operon sequence (18S+ITS1+5.8S+ITS2+28S) of the archigregarine Selenidium sp., an intestine parasite of spionid polychetes Pygospio elegans and Polydora glycimerica, are obtained. Archigregarines are the most plesiomorphic group of sporozoan Apicomplexa: their mature gamonts and even syzygy retain a set of features, which are characteristic just for infection stages (sporo- and merozoites) of other sporozoans (apical complex of organelles consisting of conoid, polar ring, and rhoptry-micronemal system). According to molecular phylogenetic studies of archigregarine 18S rDNA performed by B. S. Leander et al., they form four branches (including two extremely long ones) hardly grouping to one another and keeping uncertain positions within Apicomplexa. The samples of Selenidium sp. from the White Sea (from P. elegans) and Sea of Japan (from P. glycimerica) have been studied."@en . "Phylogenetic position of the archigregarine Selenidium sp. as inferred from molecular phylogeny analysis using 18S, 5.8S, and 28S rDNA sequences" . "P(GBP505/12/G112)" . . . "Diakin, Andrei" . . "Archigregarine; Selenidium; phylogeny; 18S; 5.8S; 28S; rDNA"@en . "Phylogenetic position of the archigregarine Selenidium sp. as inferred from molecular phylogeny analysis using 18S, 5.8S, and 28S rDNA sequences"@en . "Phylogenetic position of the archigregarine Selenidium sp. as inferred from molecular phylogeny analysis using 18S, 5.8S, and 28S rDNA sequences" . . . . "Phylogenetic position of the archigregarine Selenidium sp. as inferred from molecular phylogeny analysis using 18S, 5.8S, and 28S rDNA sequences"@en . "Simdyanov, Timur G." . . "14310" . . "Diakin, Andrei" . . "Alesoshin, Vladimir V." . . "RIV/00216224:14310/12:00066885!RIV14-GA0-14310___" . . "Paskerova, Gita" . "158614" . . "RIV/00216224:14310/12:00066885" . "[1DAECC75602E]" . . . . . . "4"^^ .