The Kruskal-Wallis results assessing the differences in anatomical measurements of Trunk length (A), Trunk diameter (B), Body length (C), Body mass (D), Introvert length (E), Length ratio of the introvert and trunk (F), Count of tentacles (G) and Count of longitudinal bands (H). White colored boxes represent for measurements of the sipuncula from different provinces. Gradient black colored boxes represent the movement distance of sipuncula from different locations. The bottom and top of the boxes are the 25th, and 75th percentiles, the dashed vertical lines show the 50th percentiles, and the ends of the whiskers represent the minimum and maximum estimates of the movement distance. Outliers are represented by black dots beyond the whiskers.