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Bottom-dwelling teleosts, particularly flatfishes or cod living in temperate to cold seawater, sometimes develop tumor-like lesions on the body surface or in the branchial cavity. These lesions usually contain masses of so called 'X-cells' of unknown origin. We amplified a gene for small subunit ribosomal RNA (18S rRNA) from X-cell lesions of the flathead flounder Hippoglossoides dubius. Phylogenetic analysis clearly classified the obtained sequence as a protozoan, although the organism had nodoi:10.3354/dao058165 pmid:15109138 fatcat:squ2v62wrje7rcqsouxdtrhnea