Phylogenetic reconstruction based on 16S rRNA (A) and 23S rRNA (B) genes. Sequences obtained from northern gannet, European herring gull, common murre, and/or common scoter samples and representative Chlamydiaceae species, as well as two outgroup species comprising W. chondrophila and S. genevensis were used. Symbols: ●, northern gannet (group 1); ○, northern gannet (group 2); ■, common murre; □, European herring gull; △, common scoter.