Figure 3: The synonymous substitutions (Ks) distribution of the paralogues and orthologues of the Chinese and Atlantic horseshoe crab.
From: Draft genomic and transcriptome resources for marine chelicerate Tachypleus tridentatus

The ‘*’ indicates the peak derived from the whole-genome duplication event, whereas the ‘#’ indicates the peak derived from small-scale duplications events (SSDs, tandem duplications) in the Chinese horseshoe crab.