Striped shore crabs (pachygrapsus crassipes) ~ These crabs are known as grapsid crabs. What makes them different from all other grapsids is the transverse lines on its carapace (outer shell) and the two teeth (rather than 3) on the anterolateral margin of its carapace.  Striped shore crabs spend at least half of their time on land but submerge now and then to wet their gills and feed. They feed on films of algae and diatoms which is scraped off the rocks with the tips of their pincers.  They also eat dead animals or small intertidal invertebrates and have been noted eating limpets.  Predators include gulls, raccoons anemones and fish.