Fig. 1

Distribution of Lamellibrachia columna (Braby et al. 2007; Kojima et al. 2003; Kojima et al. 2001), Lamellibrachia sagami (Kobayashi et al. 2015; Kojima et al. 2003; Kojima et al. 2001), and Lamellibrachia sp. L2 (Kojima et al. 1997; Kojima et al. 2001). Squares represent L. columna localities, circles represent L. sagami localities, and diamonds represent L. sp. L2 localities. Symbols that are white represent localities with supporting molecular data, while symbols that are grey represent localities without molecular data. Black square represents the newly sampled L. columna with molecular data from this study. Star and triangle represent type localities for L. columna and L. sagami, respectively